Implement initial iOS application structure for DES Cracker

- Added AppDelegate and main entry point for the application. - Created Info.plist for application configuration. - Introduced UI components with PSCSlaveViewController for user interaction. - Implemented networking and computation engines (CPU and Metal) for DES cracking. - Established asset catalog for application resources including icons and colors. - Updated results.json to reflect new elapsed time for brute force operations.
2026-09-19 17:02:33 +01:00 · 2026-09-19 17:02:33 +01:00 · bb690f3a1f
commit bb690f3a1f
parent 8f2d3a2489
25 changed files with 2747 additions and 62 deletions
--- a/decoded/bruteforce/results.json
+++ b/decoded/bruteforce/results.json
@ -1,5 +1,5 @@
 {
-  "elapsed_sec": 61.97,
+  "elapsed_sec": 46.262,
  "pad_matches": [],
  "confirmed": []
 }
--- a/ios/DESCracker.xcodeproj/project.pbxproj
+++ b/ios/DESCracker.xcodeproj/project.pbxproj
@ -0,0 +1,431 @@
+// !$*UTF8*$!
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+	classes = {
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+				CURRENT_PROJECT_VERSION = 1;
+				ENABLE_PREVIEWS = NO;
+				GENERATE_INFOPLIST_FILE = NO;
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+					"$(SRCROOT)/DESCracker",
+					"$(SRCROOT)/DESCracker/UI",
+					"$(SRCROOT)/DESCracker/Network",
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+				INFOPLIST_FILE = DESCracker/Info.plist;
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+				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.utilities";
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+				ENABLE_PREVIEWS = NO;
+				GENERATE_INFOPLIST_FILE = NO;
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+				USER_HEADER_SEARCH_PATHS = (
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+					"$(SRCROOT)/DESCracker/Network",
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+}
--- a/ios/DESCracker.xcodeproj/xcshareddata/xcschemes/DES
+++ b/ios/DESCracker.xcodeproj/xcshareddata/xcschemes/DES
@ -0,0 +1,77 @@
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+            BuildableName = "DES Cracker.app"
+            BlueprintName = "DESCracker"
+            ReferencedContainer = "container:DESCracker.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "A10000000000000000000002"
+            BuildableName = "DES Cracker.app"
+            BlueprintName = "DESCracker"
+            ReferencedContainer = "container:DESCracker.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
--- a/ios/DESCracker/AppDelegate.h
+++ b/ios/DESCracker/AppDelegate.h
@ -0,0 +1,5 @@
+#import <UIKit/UIKit.h>
+
+@interface AppDelegate : UIResponder <UIApplicationDelegate>
+@property (nonatomic, strong) UIWindow *window;
+@end
--- a/ios/DESCracker/AppDelegate.m
+++ b/ios/DESCracker/AppDelegate.m
@ -0,0 +1,14 @@
+#import "AppDelegate.h"
+#import "PSCSlaveViewController.h"
+
+@implementation AppDelegate
+
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+    self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
+    self.window.backgroundColor = [UIColor colorWithRed:0x10 / 255.0 green:0x15 / 255.0 blue:0x1c / 255.0 alpha:1];
+    self.window.rootViewController = [[PSCSlaveViewController alloc] init];
+    [self.window makeKeyAndVisible];
+    return YES;
+}
+
+@end
--- a/ios/DESCracker/Assets.xcassets/AccentColor.colorset/Contents.json
+++ b/ios/DESCracker/Assets.xcassets/AccentColor.colorset/Contents.json
@ -0,0 +1,20 @@
+{
+  "colors" : [
+    {
+      "color" : {
+        "color-space" : "srgb",
+        "components" : {
+          "alpha" : "1.000",
+          "blue" : "0.831",
+          "green" : "0.918",
+          "red" : "0.369"
+        }
+      },
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
--- a/ios/DESCracker/Assets.xcassets/AppIcon.appiconset/AppIcon.png
+++ b/ios/DESCracker/Assets.xcassets/AppIcon.appiconset/AppIcon.png
--- a/ios/DESCracker/Assets.xcassets/AppIcon.appiconset/Contents.json
+++ b/ios/DESCracker/Assets.xcassets/AppIcon.appiconset/Contents.json
@ -0,0 +1,14 @@
+{
+  "images" : [
+    {
+      "filename" : "AppIcon.png",
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
--- a/ios/DESCracker/Assets.xcassets/Contents.json
+++ b/ios/DESCracker/Assets.xcassets/Contents.json
@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
--- a/ios/DESCracker/Assets.xcassets/LaunchBackground.colorset/Contents.json
+++ b/ios/DESCracker/Assets.xcassets/LaunchBackground.colorset/Contents.json
@ -0,0 +1,20 @@
+{
+  "colors" : [
+    {
+      "color" : {
+        "color-space" : "srgb",
+        "components" : {
+          "alpha" : "1.000",
+          "blue" : "0.110",
+          "green" : "0.082",
+          "red" : "0.063"
+        }
+      },
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
--- a/ios/DESCracker/Compute/PSCBruteEngine.h
+++ b/ios/DESCracker/Compute/PSCBruteEngine.h
@ -0,0 +1,20 @@
+#import <Foundation/Foundation.h>
+
+@class PSCAssignBlock;
+
+NS_ASSUME_NONNULL_BEGIN
+
+typedef void (^PSCBruteProgressBlock)(uint64_t done, uint64_t count, double rate);
+typedef void (^PSCBruteHitBlock)(uint64_t index, uint64_t key, uint64_t plain);
+typedef void (^PSCBruteFinishBlock)(NSInteger hits, NSTimeInterval elapsed, BOOL cancelled, NSError *_Nullable error);
+
+@protocol PSCBruteEngine <NSObject>
+- (void)runAssign:(PSCAssignBlock *)block
+       onProgress:(nullable PSCBruteProgressBlock)onProgress
+            onHit:(nullable PSCBruteHitBlock)onHit
+       completion:(nullable PSCBruteFinishBlock)completion;
+- (void)cancel;
+@end
+
+NS_ASSUME_NONNULL_END
+
--- a/ios/DESCracker/Compute/PSCCpuEngine.h
+++ b/ios/DESCracker/Compute/PSCCpuEngine.h
@ -0,0 +1,7 @@
+#import <Foundation/Foundation.h>
+#import "PSCBruteEngine.h"
+
+@interface PSCCpuEngine : NSObject <PSCBruteEngine>
+@property (nonatomic, assign, readonly) NSUInteger coreCount;
+- (BOOL)prepare:(NSError **)error;
+@end
--- a/ios/DESCracker/Compute/PSCCpuEngine.m
+++ b/ios/DESCracker/Compute/PSCCpuEngine.m
@ -0,0 +1,155 @@
+#import "PSCCpuEngine.h"
+#import "PSCProtocol.h"
+#import "des.h"
+#import <stdatomic.h>
+#import <string.h>
+#import <QuartzCore/QuartzCore.h>
+
+@interface PSCCpuEngine () {
+    atomic_bool _cancelled;
+    atomic_ullong _generation;
+}
+@property (nonatomic, strong) dispatch_queue_t workQueue;
+@end
+
+@implementation PSCCpuEngine
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        NSUInteger n = NSProcessInfo.processInfo.processorCount;
+        _coreCount = n > 0 ? n : 1;
+        _workQueue = dispatch_queue_create("com.descracker.cpu", DISPATCH_QUEUE_SERIAL);
+        atomic_init(&_cancelled, false);
+        atomic_init(&_generation, 0);
+    }
+    return self;
+}
+
+- (BOOL)prepare:(NSError **)error {
+    if (!des_selftest()) {
+        if (error) {
+            *error = [NSError errorWithDomain:@"DESCracker" code:6 userInfo:@{
+                NSLocalizedDescriptionKey : @"CPU DES self-test failed"
+            }];
+        }
+        return NO;
+    }
+    return YES;
+}
+
+- (void)cancel {
+    atomic_store(&_cancelled, true);
+    atomic_fetch_add(&_generation, 1);
+}
+
+- (void)runAssign:(PSCAssignBlock *)block
+       onProgress:(PSCBruteProgressBlock)onProgress
+            onHit:(PSCBruteHitBlock)onHit
+       completion:(PSCBruteFinishBlock)completion {
+    dispatch_async(self.workQueue, ^{
+        atomic_store(&self->_cancelled, false);
+        uint64_t generation = atomic_fetch_add(&self->_generation, 1) + 1;
+        NSTimeInterval t0 = CACurrentMediaTime();
+
+        uint32_t key_len = block.keyLen;
+        NSData *charsetData = [block.charset dataUsingEncoding:NSUTF8StringEncoding] ?: [NSData data];
+        const uint8_t *cs = charsetData.bytes;
+        uint32_t clen = (uint32_t)charsetData.length;
+        uint32_t pad_byte = block.padByte;
+        uint64_t target = block.target;
+        uint64_t start = block.start;
+        uint64_t count = block.count;
+        NSUInteger workers = block.cpuWorkers ? (NSUInteger)MAX(1, block.cpuWorkers.integerValue) : self.coreCount;
+        if (workers == 0) {
+            workers = 1;
+        }
+
+        NSMutableData *fillData = [NSMutableData dataWithLength:sizeof(uint64_t) * 8];
+        uint64_t *fills = fillData.mutableBytes;
+        uint32_t nfills = 0;
+        for (NSNumber *item in block.fills) {
+            if (nfills >= 8) {
+                break;
+            }
+            fills[nfills++] = item.unsignedLongLongValue;
+        }
+
+        __block atomic_ullong done;
+        atomic_init(&done, 0);
+        __block NSInteger hits = 0;
+        __block atomic_bool cancelledFlag;
+        atomic_init(&cancelledFlag, false);
+        NSLock *hitLock = [[NSLock alloc] init];
+
+        dispatch_queue_t pool = dispatch_get_global_queue(QOS_CLASS_USER_INITIATED, 0);
+        dispatch_group_t group = dispatch_group_create();
+        uint64_t chunk = count / workers;
+        uint64_t rem = count % workers;
+        uint64_t cursor = start;
+
+        for (NSUInteger w = 0; w < workers; w++) {
+            uint64_t n = chunk + (w < rem ? 1 : 0);
+            if (n == 0) {
+                continue;
+            }
+            uint64_t wstart = cursor;
+            uint64_t wcount = n;
+            cursor += n;
+            dispatch_group_async(group, pool, ^{
+                uint64_t local = 0;
+                for (uint64_t i = 0; i < wcount; i++) {
+                    if ((local & 0x3FFF) == 0 &&
+                        (atomic_load(&self->_cancelled) || atomic_load(&self->_generation) != generation)) {
+                        atomic_store(&cancelledFlag, true);
+                        break;
+                    }
+                    uint64_t index = wstart + i;
+                    uint64_t key = make_key(index, key_len, clen, pad_byte, cs);
+                    uint64_t sk[16];
+                    des_key_schedule(key, sk);
+                    uint64_t pt = des_crypt(target, sk, 1);
+                    if (is_fill(pt, fills, nfills)) {
+                        [hitLock lock];
+                        hits += 1;
+                        [hitLock unlock];
+                        if (onHit) {
+                            onHit(index, key, pt);
+                        }
+                    }
+                    local++;
+                    if ((local & 0x3FFF) == 0) {
+                        uint64_t soFar = atomic_fetch_add(&done, 0x4000) + 0x4000;
+                        double elapsed = CACurrentMediaTime() - t0;
+                        if (elapsed < 1e-6) {
+                            elapsed = 1e-6;
+                        }
+                        if (onProgress) {
+                            onProgress(soFar > count ? count : soFar, count, soFar / elapsed);
+                        }
+                        local = 0;
+                    }
+                }
+                if (local) {
+                    atomic_fetch_add(&done, local);
+                }
+            });
+        }
+        dispatch_group_wait(group, DISPATCH_TIME_FOREVER);
+
+        BOOL cancelled = atomic_load(&cancelledFlag) || atomic_load(&self->_cancelled) ||
+                         atomic_load(&self->_generation) != generation;
+        if (!cancelled && onProgress) {
+            double elapsed = CACurrentMediaTime() - t0;
+            if (elapsed < 1e-6) {
+                elapsed = 1e-6;
+            }
+            onProgress(count, count, count / elapsed);
+        }
+        if (completion) {
+            completion(hits, CACurrentMediaTime() - t0, cancelled, nil);
+        }
+    });
+}
+
+@end
--- a/ios/DESCracker/Compute/PSCMetalEngine.h
+++ b/ios/DESCracker/Compute/PSCMetalEngine.h
@ -0,0 +1,9 @@
+#import <Foundation/Foundation.h>
+#import "PSCBruteEngine.h"
+
+@interface PSCMetalEngine : NSObject <PSCBruteEngine>
+@property (nonatomic, readonly) BOOL available;
+@property (nonatomic, copy, readonly) NSString *gpuName;
+@property (nonatomic, assign, readonly) uint64_t memoryBytes;
+- (BOOL)prepare:(NSError **)error;
+@end
--- a/ios/DESCracker/Compute/PSCMetalEngine.m
+++ b/ios/DESCracker/Compute/PSCMetalEngine.m
@ -0,0 +1,266 @@
+#import "PSCMetalEngine.h"
+#import "PSCProtocol.h"
+#import <Metal/Metal.h>
+#import <stdatomic.h>
+#import <string.h>
+#import <QuartzCore/QuartzCore.h>
+
+enum { kPSCMaxHits = 256, kPSCThreadsPerGroup = 256, kPSCParamsSize = 104, kPSCDefaultBatch = 1048576 };
+
+typedef struct {
+    uint64_t index;
+    uint64_t key;
+    uint64_t plain;
+} PSCHit;
+
+@interface PSCMetalEngine () {
+    atomic_bool _cancelled;
+}
+@property (nonatomic, strong) id<MTLDevice> device;
+@property (nonatomic, strong) id<MTLCommandQueue> queue;
+@property (nonatomic, strong) id<MTLComputePipelineState> brutePipeline;
+@property (nonatomic, strong) dispatch_queue_t workQueue;
+@property (nonatomic, copy) NSString *activeJobId;
+@end
+
+@implementation PSCMetalEngine
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        _device = MTLCreateSystemDefaultDevice();
+        _workQueue = dispatch_queue_create("com.descracker.metal", DISPATCH_QUEUE_SERIAL);
+        atomic_init(&_cancelled, false);
+        if (_device) {
+            _gpuName = [_device.name copy] ?: @"Metal GPU";
+            if ([_device respondsToSelector:@selector(recommendedMaxWorkingSetSize)]) {
+                _memoryBytes = (uint64_t)_device.recommendedMaxWorkingSetSize;
+            }
+        } else {
+            _gpuName = @"Metal GPU";
+        }
+    }
+    return self;
+}
+
+- (BOOL)available {
+    return self.device != nil && self.brutePipeline != nil;
+}
+
+static void PSCWriteParams(void *dst, uint64_t start, uint32_t key_len, uint32_t charset_len, uint32_t pad_byte,
+                           uint32_t fill_count, uint32_t batch_count, uint64_t target, const uint64_t *fills,
+                           int nfills) {
+    uint8_t *p = dst;
+    memcpy(p, &start, 8);
+    p += 8;
+    memcpy(p, &key_len, 4);
+    p += 4;
+    memcpy(p, &charset_len, 4);
+    p += 4;
+    memcpy(p, &pad_byte, 4);
+    p += 4;
+    memcpy(p, &fill_count, 4);
+    p += 4;
+    memcpy(p, &batch_count, 4);
+    p += 4;
+    uint32_t z = 0;
+    memcpy(p, &z, 4);
+    p += 4;
+    memcpy(p, &target, 8);
+    p += 8;
+    for (int i = 0; i < 8; i++) {
+        uint64_t f = i < nfills ? fills[i] : 0;
+        memcpy(p, &f, 8);
+        p += 8;
+    }
+}
+
+- (uint32_t)currentBatchSize {
+    NSProcessInfoThermalState thermal = NSProcessInfo.processInfo.thermalState;
+    if (thermal >= NSProcessInfoThermalStateCritical) {
+        return 262144;
+    }
+    if (thermal >= NSProcessInfoThermalStateSerious) {
+        return 524288;
+    }
+    return kPSCDefaultBatch;
+}
+
+- (BOOL)prepare:(NSError **)error {
+    if (!self.device) {
+        if (error) {
+            *error = [NSError errorWithDomain:@"DESCracker" code:1 userInfo:@{
+                NSLocalizedDescriptionKey : @"No Metal GPU"
+            }];
+        }
+        return NO;
+    }
+    NSError *err = nil;
+    id<MTLLibrary> lib = [self.device newDefaultLibrary];
+    if (!lib) {
+        if (error) {
+            *error = [NSError errorWithDomain:@"DESCracker" code:2 userInfo:@{
+                NSLocalizedDescriptionKey : @"Failed to load Metal library"
+            }];
+        }
+        return NO;
+    }
+    id<MTLFunction> known = [lib newFunctionWithName:@"des_known_answer"];
+    id<MTLFunction> brute = [lib newFunctionWithName:@"des_brute"];
+    if (!known || !brute) {
+        if (error) {
+            *error = [NSError errorWithDomain:@"DESCracker" code:3 userInfo:@{
+                NSLocalizedDescriptionKey : @"Metal kernels missing (des_known_answer / des_brute)"
+            }];
+        }
+        return NO;
+    }
+    id<MTLComputePipelineState> knownPipe = [self.device newComputePipelineStateWithFunction:known error:&err];
+    if (!knownPipe) {
+        if (error) {
+            *error = err;
+        }
+        return NO;
+    }
+    self.brutePipeline = [self.device newComputePipelineStateWithFunction:brute error:&err];
+    if (!self.brutePipeline) {
+        if (error) {
+            *error = err;
+        }
+        return NO;
+    }
+    self.queue = [self.device newCommandQueue];
+    id<MTLBuffer> out = [self.device newBufferWithLength:16 options:MTLResourceStorageModeShared];
+    id<MTLCommandBuffer> cmd = [self.queue commandBuffer];
+    id<MTLComputeCommandEncoder> enc = [cmd computeCommandEncoder];
+    [enc setComputePipelineState:knownPipe];
+    [enc setBuffer:out offset:0 atIndex:0];
+    [enc dispatchThreads:MTLSizeMake(1, 1, 1) threadsPerThreadgroup:MTLSizeMake(1, 1, 1)];
+    [enc endEncoding];
+    [cmd commit];
+    [cmd waitUntilCompleted];
+    uint64_t *words = out.contents;
+    uint64_t expected = 0x85E813540F0AB405ULL;
+    uint64_t plain = 0x0123456789ABCDEFULL;
+    if (words[0] != expected || words[1] != plain) {
+        if (error) {
+            *error = [NSError errorWithDomain:@"DESCracker" code:4 userInfo:@{
+                NSLocalizedDescriptionKey : [NSString stringWithFormat:@"Metal DES self-test failed ct=%016llx",
+                                                                       (unsigned long long)words[0]]
+            }];
+        }
+        self.brutePipeline = nil;
+        return NO;
+    }
+    return YES;
+}
+
+- (void)cancel {
+    atomic_store(&_cancelled, true);
+    self.activeJobId = nil;
+}
+
+- (void)runAssign:(PSCAssignBlock *)block
+       onProgress:(PSCBruteProgressBlock)onProgress
+            onHit:(PSCBruteHitBlock)onHit
+       completion:(PSCBruteFinishBlock)completion {
+    dispatch_async(self.workQueue, ^{
+        atomic_store(&self->_cancelled, false);
+        self.activeJobId = block.jobId;
+        NSString *jobId = [block.jobId copy];
+        NSTimeInterval t0 = CACurrentMediaTime();
+        NSInteger hits = 0;
+        NSError *runError = nil;
+
+        if (!self.available) {
+            if (completion) {
+                completion(0, 0, NO, [NSError errorWithDomain:@"DESCracker" code:5 userInfo:@{
+                    NSLocalizedDescriptionKey : @"Metal engine is not ready"
+                }]);
+            }
+            return;
+        }
+
+        const char *cs = block.charset.UTF8String ?: "";
+        uint32_t charset_len = (uint32_t)strlen(cs);
+        uint64_t fills[8] = {0};
+        int nfills = 0;
+        for (NSNumber *item in block.fills) {
+            if (nfills >= 8) {
+                break;
+            }
+            fills[nfills++] = item.unsignedLongLongValue;
+        }
+
+        id<MTLBuffer> paramsBuf = [self.device newBufferWithLength:kPSCParamsSize options:MTLResourceStorageModeShared];
+        id<MTLBuffer> charsetBuf = [self.device newBufferWithBytes:cs length:MAX(charset_len, 1)
+                                                           options:MTLResourceStorageModeShared];
+        id<MTLBuffer> hitsBuf = [self.device newBufferWithLength:kPSCMaxHits * sizeof(PSCHit)
+                                                        options:MTLResourceStorageModeShared];
+        id<MTLBuffer> countBuf = [self.device newBufferWithLength:4 options:MTLResourceStorageModeShared];
+
+        uint64_t done = 0;
+        uint64_t count = block.count;
+        BOOL cancelled = NO;
+        while (done < count) {
+            if (atomic_load(&self->_cancelled) || ![self.activeJobId isEqualToString:jobId]) {
+                cancelled = YES;
+                break;
+            }
+            uint32_t batch = [self currentBatchSize];
+            uint64_t remaining = count - done;
+            uint64_t n = batch < remaining ? batch : remaining;
+            *(uint32_t *)countBuf.contents = 0;
+            PSCWriteParams(paramsBuf.contents, block.start + done, block.keyLen, charset_len, block.padByte,
+                           (uint32_t)nfills, (uint32_t)n, block.target, fills, nfills);
+
+            id<MTLCommandBuffer> cmd = [self.queue commandBuffer];
+            id<MTLComputeCommandEncoder> enc = [cmd computeCommandEncoder];
+            [enc setComputePipelineState:self.brutePipeline];
+            [enc setBuffer:paramsBuf offset:0 atIndex:0];
+            [enc setBuffer:charsetBuf offset:0 atIndex:1];
+            [enc setBuffer:hitsBuf offset:0 atIndex:2];
+            [enc setBuffer:countBuf offset:0 atIndex:3];
+            NSUInteger groups = (NSUInteger)((n + kPSCThreadsPerGroup - 1) / kPSCThreadsPerGroup);
+            [enc dispatchThreadgroups:MTLSizeMake(groups, 1, 1)
+                threadsPerThreadgroup:MTLSizeMake(kPSCThreadsPerGroup, 1, 1)];
+            [enc endEncoding];
+            [cmd commit];
+            [cmd waitUntilCompleted];
+            if (cmd.error) {
+                runError = cmd.error;
+                break;
+            }
+
+            uint32_t hitn = *(uint32_t *)countBuf.contents;
+            if (hitn > kPSCMaxHits) {
+                hitn = kPSCMaxHits;
+            }
+            PSCHit *outHits = hitsBuf.contents;
+            for (uint32_t i = 0; i < hitn; i++) {
+                hits += 1;
+                if (onHit) {
+                    onHit(outHits[i].index, outHits[i].key, outHits[i].plain);
+                }
+            }
+            done += n;
+            double elapsed = CACurrentMediaTime() - t0;
+            if (elapsed < 1e-6) {
+                elapsed = 1e-6;
+            }
+            if (onProgress) {
+                onProgress(done, count, done / elapsed);
+            }
+        }
+
+        if ([self.activeJobId isEqualToString:jobId]) {
+            self.activeJobId = nil;
+        }
+        NSTimeInterval elapsed = CACurrentMediaTime() - t0;
+        if (completion) {
+            completion(hits, elapsed, cancelled, runError);
+        }
+    });
+}
+
+@end
--- a/ios/DESCracker/Info.plist
+++ b/ios/DESCracker/Info.plist
@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleDisplayName</key>
+	<string>DES Cracker</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>DES Cracker</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>NSAppTransportSecurity</key>
+	<dict>
+		<key>NSAllowsArbitraryLoads</key>
+		<true/>
+		<key>NSAllowsLocalNetworking</key>
+		<true/>
+	</dict>
+	<key>NSLocalNetworkUsageDescription</key>
+	<string>DES Cracker connects to the desktop master on your local network to receive search work.</string>
+	<key>UILaunchScreen</key>
+	<dict>
+		<key>UIColorName</key>
+		<string>LaunchBackground</string>
+	</dict>
+	<key>UIStatusBarStyle</key>
+	<string>UIStatusBarStyleLightContent</string>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UIUserInterfaceStyle</key>
+	<string>Dark</string>
+</dict>
+</plist>
--- a/ios/DESCracker/Network/PSCProtocol.h
+++ b/ios/DESCracker/Network/PSCProtocol.h
@ -0,0 +1,57 @@
+#import <Foundation/Foundation.h>
+#include <stdint.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+static const NSInteger kPSCProtocolVersion = 2;
+static const NSInteger kPSCDefaultPort = 9876;
+static const NSTimeInterval kPSCProgressInterval = 0.5;
+static const NSTimeInterval kPSCPingInterval = 5.0;
+
+NSString *PSCFormatDec64(uint64_t value);
+NSString *PSCFormatHex64(uint64_t value);
+NSString *PSCFormatCount(uint64_t value);
+NSString *PSCFormatRate(double rate);
+uint64_t PSCParseDec64(id value);
+uint64_t PSCParseHex64(NSString *hex);
+
+@interface PSCComputeDevice : NSObject
+@property (nonatomic, copy) NSString *key;
+@property (nonatomic, assign) NSInteger deviceId;
+@property (nonatomic, copy) NSString *name;
+@property (nonatomic, copy) NSString *type;
+@property (nonatomic, strong, nullable) NSNumber *cores;
+@property (nonatomic, strong, nullable) NSNumber *memory;
+- (NSDictionary *)JSONObject;
+@end
+
+@interface PSCAssignBlock : NSObject
+@property (nonatomic, copy) NSString *jobId;
+@property (nonatomic, copy) NSString *deviceKey;
+@property (nonatomic, assign) uint64_t start;
+@property (nonatomic, assign) uint64_t count;
+@property (nonatomic, assign) uint32_t keyLen;
+@property (nonatomic, copy) NSString *charset;
+@property (nonatomic, assign) uint32_t padByte;
+@property (nonatomic, assign) uint64_t target;
+@property (nonatomic, copy) NSArray<NSNumber *> *fills;
+@property (nonatomic, strong, nullable) NSNumber *cpuWorkers;
+ (nullable instancetype)fromJSON:(NSDictionary *)json;
+@end
+
+@interface PSCWorkerSnapshot : NSObject
+@property (nonatomic, copy) NSString *deviceKey;
+@property (nonatomic, copy) NSString *deviceName;
+@property (nonatomic, copy) NSString *deviceType;
+@property (nonatomic, copy) NSString *current;
+@property (nonatomic, assign) double pct;
+@property (nonatomic, assign) NSInteger completedBlocks;
+@property (nonatomic, assign) double rate;
+@property (nonatomic, assign) BOOL busy;
+@end
+
+NSDictionary *_Nullable PSCDecodeMessage(NSString *raw);
+NSString *_Nullable PSCEncodeMessage(NSDictionary *msg);
+
+NS_ASSUME_NONNULL_END
+
--- a/ios/DESCracker/Network/PSCProtocol.m
+++ b/ios/DESCracker/Network/PSCProtocol.m
@ -0,0 +1,146 @@
+#import "PSCProtocol.h"
+#import <math.h>
+#import <stdlib.h>
+
+NSString *PSCFormatDec64(uint64_t value) {
+    return [NSString stringWithFormat:@"%llu", (unsigned long long)value];
+}
+
+NSString *PSCFormatHex64(uint64_t value) {
+    return [NSString stringWithFormat:@"%016llx", (unsigned long long)value];
+}
+
+NSString *PSCFormatCount(uint64_t value) {
+    double n = (double)value;
+    if (n >= 1e9) {
+        return [NSString stringWithFormat:@"%.1fB", n / 1e9];
+    }
+    if (n >= 1e6) {
+        return [NSString stringWithFormat:@"%.1fM", n / 1e6];
+    }
+    if (n >= 1e3) {
+        return [NSString stringWithFormat:@"%.1fk", n / 1e3];
+    }
+    return [NSString stringWithFormat:@"%.0f", n];
+}
+
+NSString *PSCFormatRate(double rate) {
+    if (rate <= 0 || !isfinite(rate)) {
+        return @"—";
+    }
+    return [NSString stringWithFormat:@"%@/s", PSCFormatCount((uint64_t)llround(rate))];
+}
+
+uint64_t PSCParseDec64(id value) {
+    if ([value isKindOfClass:[NSString class]]) {
+        return strtoull([(NSString *)value UTF8String], NULL, 10);
+    }
+    if ([value isKindOfClass:[NSNumber class]]) {
+        return [(NSNumber *)value unsignedLongLongValue];
+    }
+    return 0;
+}
+
+uint64_t PSCParseHex64(NSString *hex) {
+    if (hex.length == 0) {
+        return 0;
+    }
+    const char *p = hex.UTF8String;
+    if (p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
+        p += 2;
+    }
+    return strtoull(p, NULL, 16);
+}
+
+@implementation PSCComputeDevice
+
+- (NSDictionary *)JSONObject {
+    NSMutableDictionary *json = [@{
+        @"key" : self.key ?: @"",
+        @"id" : @(self.deviceId),
+        @"name" : self.name ?: @"",
+        @"type" : self.type ?: @"cpu",
+    } mutableCopy];
+    if (self.cores) {
+        json[@"cores"] = self.cores;
+    }
+    if (self.memory) {
+        json[@"memory"] = self.memory;
+    }
+    return json;
+}
+
+@end
+
+@implementation PSCAssignBlock
+
+ (instancetype)fromJSON:(NSDictionary *)json {
+    if (![json isKindOfClass:[NSDictionary class]]) {
+        return nil;
+    }
+    PSCAssignBlock *block = [[PSCAssignBlock alloc] init];
+    block.jobId = [json[@"jobId"] isKindOfClass:[NSString class]] ? json[@"jobId"] : @"";
+    block.deviceKey = [json[@"deviceKey"] isKindOfClass:[NSString class]] ? json[@"deviceKey"] : @"";
+    block.start = PSCParseDec64(json[@"start"]);
+    block.count = PSCParseDec64(json[@"count"]);
+    block.keyLen = (uint32_t)PSCParseDec64(json[@"keyLen"]);
+    block.charset = [json[@"charset"] isKindOfClass:[NSString class]] ? json[@"charset"] : @"";
+    block.padByte = (uint32_t)(PSCParseDec64(json[@"padByte"]) & 0xFF);
+    id target = json[@"target"];
+    block.target = [target isKindOfClass:[NSString class]] ? PSCParseHex64(target) : PSCParseDec64(target);
+    NSMutableArray<NSNumber *> *fills = [NSMutableArray array];
+    id fillsVal = json[@"fills"];
+    if ([fillsVal isKindOfClass:[NSArray class]]) {
+        for (id item in (NSArray *)fillsVal) {
+            if (fills.count >= 8) {
+                break;
+            }
+            uint64_t f = [item isKindOfClass:[NSString class]] ? PSCParseHex64(item) : PSCParseDec64(item);
+            [fills addObject:@(f)];
+        }
+    }
+    block.fills = fills;
+    id workers = json[@"cpuWorkers"];
+    if ([workers isKindOfClass:[NSNumber class]]) {
+        block.cpuWorkers = workers;
+    }
+    if (block.jobId.length == 0 || block.count == 0 || block.keyLen == 0 || block.charset.length == 0) {
+        return nil;
+    }
+    return block;
+}
+
+@end
+
+@implementation PSCWorkerSnapshot
+@end
+
+NSDictionary *PSCDecodeMessage(NSString *raw) {
+    if (raw.length == 0) {
+        return nil;
+    }
+    NSData *data = [raw dataUsingEncoding:NSUTF8StringEncoding];
+    if (!data) {
+        return nil;
+    }
+    id parsed = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
+    if (![parsed isKindOfClass:[NSDictionary class]]) {
+        return nil;
+    }
+    NSDictionary *msg = parsed;
+    if (![msg[@"type"] isKindOfClass:[NSString class]]) {
+        return nil;
+    }
+    return msg;
+}
+
+NSString *PSCEncodeMessage(NSDictionary *msg) {
+    if (!msg) {
+        return nil;
+    }
+    NSData *data = [NSJSONSerialization dataWithJSONObject:msg options:0 error:nil];
+    if (!data) {
+        return nil;
+    }
+    return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
+}
--- a/ios/DESCracker/Network/PSCSlaveClient.h
+++ b/ios/DESCracker/Network/PSCSlaveClient.h
@ -0,0 +1,25 @@
+#import <Foundation/Foundation.h>
+#import "PSCProtocol.h"
+
+@class PSCSlaveClient;
+
+@protocol PSCSlaveClientDelegate <NSObject>
+- (void)slaveClient:(PSCSlaveClient *)client didChangeStatus:(NSString *)status connected:(BOOL)connected;
+- (void)slaveClient:(PSCSlaveClient *)client didLog:(NSString *)line;
+- (void)slaveClient:(PSCSlaveClient *)client didUpdateWorkers:(NSArray<PSCWorkerSnapshot *> *)workers;
+- (void)slaveClient:(PSCSlaveClient *)client didHitJob:(NSString *)jobId index:(NSString *)index keyHex:(NSString *)keyHex;
+@end
+
+@interface PSCSlaveClient : NSObject
+@property (nonatomic, weak) id<PSCSlaveClientDelegate> delegate;
+@property (nonatomic, readonly, getter=isConnected) BOOL connected;
+@property (nonatomic, assign) NSUInteger cpuWorkers;
+@property (nonatomic, readonly) BOOL metalAvailable;
+@property (nonatomic, copy, readonly) NSString *metalName;
+@property (nonatomic, assign, readonly) uint64_t metalMemory;
+@property (nonatomic, assign, readonly) NSUInteger cpuCores;
+- (BOOL)prepareEngines:(NSError **)error;
+- (void)setDevices:(NSArray<PSCComputeDevice *> *)devices;
+- (void)connectToHost:(NSString *)host port:(NSInteger)port;
+- (void)disconnect;
+@end
--- a/ios/DESCracker/Network/PSCSlaveClient.m
+++ b/ios/DESCracker/Network/PSCSlaveClient.m
@ -0,0 +1,604 @@
+#import "PSCSlaveClient.h"
+#import "PSCCpuEngine.h"
+#import "PSCMetalEngine.h"
+
+@interface PSCDeviceJob : NSObject
+@property (nonatomic, copy) NSString *jobId;
+@property (nonatomic, assign) uint64_t done;
+@property (nonatomic, assign) uint64_t count;
+@property (nonatomic, assign) double rate;
+@property (nonatomic, copy) void (^kill)(void);
+@end
+
+@implementation PSCDeviceJob
+@end
+
+@interface PSCRateStats : NSObject
+@property (nonatomic, assign) uint64_t keysDone;
+@property (nonatomic, assign) NSTimeInterval activeMs;
+@property (nonatomic, strong) NSDate *busyStarted;
+@end
+
+@implementation PSCRateStats
+@end
+
+@interface PSCProgressGate : NSObject
+@property (nonatomic, assign) NSTimeInterval lastSent;
+@property (nonatomic, assign) BOOL timerPending;
+@property (nonatomic, copy) NSDictionary *payload;
+@end
+
+@implementation PSCProgressGate
+@end
+
+@interface PSCSlaveClient () <NSURLSessionWebSocketDelegate>
+@property (nonatomic, copy) NSArray<PSCComputeDevice *> *devices;
+@property (nonatomic, strong) NSURLSession *session;
+@property (nonatomic, strong) NSURLSessionWebSocketTask *task;
+@property (nonatomic, strong) NSTimer *pingTimer;
+@property (nonatomic, strong) NSMutableDictionary<NSString *, PSCDeviceJob *> *jobs;
+@property (nonatomic, strong) NSMutableDictionary<NSString *, NSNumber *> *completedBlocks;
+@property (nonatomic, strong) NSMutableDictionary<NSString *, PSCProgressGate *> *progressGates;
+@property (nonatomic, strong) NSMutableDictionary<NSString *, PSCRateStats *> *rateStats;
+@property (nonatomic, strong) PSCMetalEngine *metal;
+@property (nonatomic, strong) PSCCpuEngine *cpu;
+@property (nonatomic, strong) dispatch_queue_t syncQueue;
+@property (nonatomic, copy) NSString *connectURL;
+@end
+
+@implementation PSCSlaveClient
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        _devices = @[];
+        _jobs = [NSMutableDictionary dictionary];
+        _completedBlocks = [NSMutableDictionary dictionary];
+        _progressGates = [NSMutableDictionary dictionary];
+        _rateStats = [NSMutableDictionary dictionary];
+        _cpuWorkers = MAX(1, NSProcessInfo.processInfo.processorCount);
+        _metal = [[PSCMetalEngine alloc] init];
+        _cpu = [[PSCCpuEngine alloc] init];
+        _syncQueue = dispatch_queue_create("com.descracker.slave", DISPATCH_QUEUE_SERIAL);
+        NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
+        config.waitsForConnectivity = NO;
+        _session = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:nil];
+    }
+    return self;
+}
+
+- (BOOL)isConnected {
+    return self.task != nil && self.task.state == NSURLSessionTaskStateRunning;
+}
+
+- (BOOL)metalAvailable {
+    return self.metal.available;
+}
+
+- (NSString *)metalName {
+    return self.metal.gpuName;
+}
+
+- (uint64_t)metalMemory {
+    return self.metal.memoryBytes;
+}
+
+- (NSUInteger)cpuCores {
+    return self.cpu.coreCount;
+}
+
+- (BOOL)prepareEngines:(NSError **)error {
+    NSError *metalErr = nil;
+    BOOL metalOK = [self.metal prepare:&metalErr];
+    NSError *cpuErr = nil;
+    BOOL cpuOK = [self.cpu prepare:&cpuErr];
+    if (!metalOK && error) {
+        *error = metalErr;
+    }
+    if (!cpuOK) {
+        if (error && !metalErr) {
+            *error = cpuErr;
+        }
+        return NO;
+    }
+    return metalOK || cpuOK;
+}
+
+- (void)setDevices:(NSArray<PSCComputeDevice *> *)devices {
+    dispatch_async(self.syncQueue, ^{
+        self.devices = [devices copy] ?: @[];
+        for (PSCComputeDevice *device in self.devices) {
+            if (!self.completedBlocks[device.key]) {
+                self.completedBlocks[device.key] = @0;
+            }
+        }
+        [self emitWorkers];
+    });
+}
+
+- (void)connectToHost:(NSString *)host port:(NSInteger)port {
+    [self disconnect];
+    NSString *urlString = [NSString stringWithFormat:@"ws://%@:%ld", host, (long)port];
+    self.connectURL = urlString;
+    [self notifyStatus:[NSString stringWithFormat:@"Connecting to %@…", urlString] connected:NO];
+    NSURL *url = [NSURL URLWithString:urlString];
+    if (!url) {
+        [self log:[NSString stringWithFormat:@"Invalid URL %@", urlString]];
+        [self notifyStatus:@"Disconnected" connected:NO];
+        return;
+    }
+    self.task = [self.session webSocketTaskWithURL:url];
+    [self.task resume];
+}
+
+- (void)disconnect {
+    dispatch_sync(self.syncQueue, ^{
+        [self clearPing];
+        [self killAll];
+    });
+    NSURLSessionWebSocketTask *task = self.task;
+    self.task = nil;
+    if (task) {
+        [task cancelWithCloseCode:NSURLSessionWebSocketCloseCodeNormalClosure reason:nil];
+    }
+    dispatch_async(self.syncQueue, ^{
+        [self emitWorkers];
+    });
+}
+
+- (void)URLSession:(NSURLSession *)session
+      webSocketTask:(NSURLSessionWebSocketTask *)webSocketTask
+ didOpenWithProtocol:(NSString *)protocol {
+    (void)session;
+    (void)protocol;
+    if (webSocketTask != self.task) {
+        return;
+    }
+    dispatch_async(self.syncQueue, ^{
+        NSMutableArray *deviceJSON = [NSMutableArray array];
+        for (PSCComputeDevice *device in self.devices) {
+            [deviceJSON addObject:[device JSONObject]];
+        }
+        NSString *hostname = NSProcessInfo.processInfo.hostName ?: @"iOS";
+        [self send:@{
+            @"type" : @"hello",
+            @"hostname" : hostname,
+            @"platform" : @"ios arm64",
+            @"devices" : deviceJSON,
+        }];
+        NSString *exposed = self.devices.count == 0 ? @"no workers" : [[self.devices valueForKey:@"name"] componentsJoinedByString:@", "];
+        [self notifyStatus:[NSString stringWithFormat:@"Connected to %@", self.connectURL] connected:YES];
+        [self log:[NSString stringWithFormat:@"Hello sent (protocol %ld) — exposing %@", (long)kPSCProtocolVersion, exposed]];
+        [self emitWorkers];
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [self.pingTimer invalidate];
+            __weak typeof(self) weakSelf = self;
+            self.pingTimer = [NSTimer scheduledTimerWithTimeInterval:kPSCPingInterval
+                                                             repeats:YES
+                                                               block:^(__unused NSTimer *timer) {
+                [weakSelf send:@{@"type" : @"ping"}];
+            }];
+        });
+        [self listen];
+    });
+}
+
+- (void)URLSession:(NSURLSession *)session
+              task:(NSURLSessionTask *)task
+didCompleteWithError:(NSError *)error {
+    (void)session;
+    if (task != self.task && self.task != nil) {
+        return;
+    }
+    dispatch_async(self.syncQueue, ^{
+        [self clearPing];
+        [self killAll];
+        if (self.task == task) {
+            self.task = nil;
+        }
+        if (error && error.code != NSURLErrorCancelled) {
+            [self log:[NSString stringWithFormat:@"WebSocket error: %@", error.localizedDescription]];
+        }
+        [self notifyStatus:@"Disconnected" connected:NO];
+        [self emitWorkers];
+    });
+}
+
+- (void)listen {
+    NSURLSessionWebSocketTask *task = self.task;
+    if (!task) {
+        return;
+    }
+    __weak typeof(self) weakSelf = self;
+    [task receiveMessageWithCompletionHandler:^(NSURLSessionWebSocketMessage *message, NSError *error) {
+        PSCSlaveClient *strong = weakSelf;
+        if (!strong || task != strong.task) {
+            return;
+        }
+        if (error) {
+            return;
+        }
+        if (message.type == NSURLSessionWebSocketMessageTypeString && message.string) {
+            NSDictionary *msg = PSCDecodeMessage(message.string);
+            if (msg) {
+                [strong onServer:msg];
+            }
+        }
+        [strong listen];
+    }];
+}
+
+- (void)onServer:(NSDictionary *)msg {
+    NSString *type = msg[@"type"];
+    if ([type isEqualToString:@"hello_ack"]) {
+        [self log:[NSString stringWithFormat:@"Master ack v%@", msg[@"protocolVersion"] ?: @"?"]];
+        return;
+    }
+    if ([type isEqualToString:@"assign"]) {
+        PSCAssignBlock *block = [PSCAssignBlock fromJSON:msg];
+        if (!block) {
+            [self log:@"Ignored malformed assign"];
+            return;
+        }
+        [self runAssign:block];
+        return;
+    }
+    if ([type isEqualToString:@"cancel"]) {
+        dispatch_async(self.syncQueue, ^{
+            [self killAll];
+            [self log:@"Cancel received"];
+            [self notifyStatus:@"Idle (cancelled)" connected:YES];
+            [self emitWorkers];
+        });
+        return;
+    }
+    if ([type isEqualToString:@"shutdown"]) {
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [self disconnect];
+        });
+    }
+}
+
+- (id<PSCBruteEngine>)engineForDevice:(PSCComputeDevice *)device {
+    if ([device.type isEqualToString:@"metal"]) {
+        return self.metal;
+    }
+    return self.cpu;
+}
+
+- (PSCComputeDevice *)deviceForKey:(NSString *)key {
+    for (PSCComputeDevice *device in self.devices) {
+        if ([device.key isEqualToString:key]) {
+            return device;
+        }
+    }
+    for (PSCComputeDevice *device in self.devices) {
+        if ([device.type isEqualToString:@"metal"]) {
+            return device;
+        }
+    }
+    return self.devices.firstObject;
+}
+
+- (void)runAssign:(PSCAssignBlock *)block {
+    dispatch_async(self.syncQueue, ^{
+        PSCComputeDevice *matched = nil;
+        for (PSCComputeDevice *device in self.devices) {
+            if ([device.key isEqualToString:block.deviceKey]) {
+                matched = device;
+                break;
+            }
+        }
+        PSCComputeDevice *device = matched ?: [self deviceForKey:block.deviceKey];
+        if (!device) {
+            [self send:@{@"type" : @"error", @"jobId" : block.jobId, @"message" : @"no compute device selected"}];
+            return;
+        }
+        if (!matched) {
+            [self log:[NSString stringWithFormat:@"No device %@; using %@", block.deviceKey, device.name]];
+        }
+        PSCDeviceJob *existing = self.jobs[device.key];
+        if (existing.kill) {
+            existing.kill();
+        }
+        [self clearProgressGate:device.key];
+        [self log:[NSString stringWithFormat:@"Assigned %@  len=%u pad=0x%02x start=%llu count=%llu", device.name,
+                                             block.keyLen, block.padByte, (unsigned long long)block.start,
+                                             (unsigned long long)block.count]];
+        NSDate *started = [NSDate date];
+        __block NSInteger hitCount = 0;
+        id<PSCBruteEngine> engine = [self engineForDevice:device];
+        NSString *deviceKey = device.key;
+        NSString *jobId = block.jobId;
+
+        PSCDeviceJob *job = [[PSCDeviceJob alloc] init];
+        job.jobId = jobId;
+        job.done = 0;
+        job.count = block.count;
+        job.rate = 0;
+        __weak typeof(self) weakSelf = self;
+        job.kill = ^{
+            [engine cancel];
+        };
+        self.jobs[deviceKey] = job;
+        [self beginRate:deviceKey];
+        [self updateStatus];
+        [self emitWorkers];
+
+        PSCBruteProgressBlock onProgress = ^(uint64_t done, uint64_t count, double rate) {
+            dispatch_async(weakSelf.syncQueue, ^{
+                PSCDeviceJob *live = weakSelf.jobs[deviceKey];
+                if (live && [live.jobId isEqualToString:jobId]) {
+                    live.done = done;
+                    live.count = count;
+                    live.rate = rate;
+                }
+                [weakSelf sendProgressJob:jobId deviceKey:deviceKey done:done count:count rate:rate];
+                [weakSelf updateStatus];
+                [weakSelf emitWorkers];
+            });
+        };
+        PSCBruteHitBlock onHit = ^(uint64_t index, uint64_t key, uint64_t plain) {
+            dispatch_async(weakSelf.syncQueue, ^{
+                hitCount += 1;
+                NSString *indexS = PSCFormatDec64(index);
+                NSString *keyHex = PSCFormatHex64(key);
+                NSString *plainHex = PSCFormatHex64(plain);
+                [weakSelf send:@{
+                    @"type" : @"hit",
+                    @"jobId" : jobId,
+                    @"index" : indexS,
+                    @"keyHex" : keyHex,
+                    @"plainHex" : plainHex,
+                }];
+                dispatch_async(dispatch_get_main_queue(), ^{
+                    [weakSelf.delegate slaveClient:weakSelf didHitJob:jobId index:indexS keyHex:keyHex];
+                });
+            });
+        };
+        [engine runAssign:block
+               onProgress:onProgress
+                    onHit:onHit
+               completion:^(NSInteger hits, NSTimeInterval elapsed, BOOL cancelled, NSError *error) {
+                   (void)hits;
+                   dispatch_async(weakSelf.syncQueue, ^{
+                       PSCDeviceJob *still = weakSelf.jobs[deviceKey];
+                       BOOL same = still && [still.jobId isEqualToString:jobId];
+                       if (cancelled) {
+                           if (same) {
+                               [weakSelf endRate:deviceKey keys:still.done];
+                               [weakSelf.jobs removeObjectForKey:deviceKey];
+                               [weakSelf clearProgressGate:deviceKey];
+                           }
+                           [weakSelf updateStatus];
+                           [weakSelf emitWorkers];
+                           return;
+                       }
+                       if (error) {
+                           if (same) {
+                               [weakSelf endRate:deviceKey keys:still.done];
+                               [weakSelf.jobs removeObjectForKey:deviceKey];
+                               [weakSelf clearProgressGate:deviceKey];
+                           }
+                           [weakSelf send:@{
+                               @"type" : @"error",
+                               @"jobId" : jobId,
+                               @"message" : error.localizedDescription ?: @"brute failed",
+                           }];
+                           [weakSelf log:error.localizedDescription];
+                           [weakSelf updateStatus];
+                           [weakSelf emitWorkers];
+                           return;
+                       }
+                       if (same) {
+                           [weakSelf.jobs removeObjectForKey:deviceKey];
+                           [weakSelf endRate:deviceKey keys:block.count];
+                           NSInteger completed = weakSelf.completedBlocks[deviceKey].integerValue + 1;
+                           weakSelf.completedBlocks[deviceKey] = @(completed);
+                           [weakSelf clearProgressGate:deviceKey];
+                           [weakSelf send:@{
+                               @"type" : @"block_complete",
+                               @"jobId" : jobId,
+                               @"deviceKey" : deviceKey,
+                               @"hits" : @(hitCount),
+                               @"elapsed" : @(elapsed > 0 ? elapsed : ([NSDate date].timeIntervalSince1970 - started.timeIntervalSince1970)),
+                           }];
+                       }
+                       [weakSelf updateStatus];
+                       [weakSelf emitWorkers];
+                   });
+               }];
+    });
+}
+
+- (void)send:(NSDictionary *)msg {
+    NSString *json = PSCEncodeMessage(msg);
+    NSURLSessionWebSocketTask *task = self.task;
+    if (!json || !task || task.state != NSURLSessionTaskStateRunning) {
+        return;
+    }
+    NSURLSessionWebSocketMessage *message = [[NSURLSessionWebSocketMessage alloc] initWithString:json];
+    [task sendMessage:message completionHandler:^(NSError *error) {
+        if (error) {
+            [self log:[NSString stringWithFormat:@"Send failed: %@", error.localizedDescription]];
+        }
+    }];
+}
+
+- (PSCRateStats *)rateFor:(NSString *)deviceKey {
+    PSCRateStats *stats = self.rateStats[deviceKey];
+    if (!stats) {
+        stats = [[PSCRateStats alloc] init];
+        self.rateStats[deviceKey] = stats;
+    }
+    return stats;
+}
+
+- (void)beginRate:(NSString *)deviceKey {
+    PSCRateStats *stats = [self rateFor:deviceKey];
+    if (!stats.busyStarted) {
+        stats.busyStarted = [NSDate date];
+    }
+}
+
+- (void)endRate:(NSString *)deviceKey keys:(uint64_t)keys {
+    PSCRateStats *stats = [self rateFor:deviceKey];
+    if (stats.busyStarted) {
+        stats.activeMs += [[NSDate date] timeIntervalSinceDate:stats.busyStarted] * 1000.0;
+        stats.busyStarted = nil;
+    }
+    if (keys > 0) {
+        stats.keysDone += keys;
+    }
+}
+
+- (double)averageRate:(NSString *)deviceKey liveDone:(uint64_t)liveDone {
+    PSCRateStats *stats = [self rateFor:deviceKey];
+    NSTimeInterval liveMs = stats.busyStarted ? [[NSDate date] timeIntervalSinceDate:stats.busyStarted] * 1000.0 : 0;
+    double sec = (stats.activeMs + liveMs) / 1000.0;
+    uint64_t keys = stats.keysDone + liveDone;
+    if (sec <= 0 || keys == 0) {
+        return 0;
+    }
+    return keys / sec;
+}
+
+- (void)killAll {
+    NSArray<NSString *> *keys = self.jobs.allKeys;
+    for (NSString *deviceKey in keys) {
+        PSCDeviceJob *job = self.jobs[deviceKey];
+        [self endRate:deviceKey keys:job.done];
+        if (job.kill) {
+            job.kill();
+        }
+        [self clearProgressGate:deviceKey];
+    }
+    [self.jobs removeAllObjects];
+}
+
+- (void)clearPing {
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [self.pingTimer invalidate];
+        self.pingTimer = nil;
+    });
+}
+
+- (PSCProgressGate *)progressGate:(NSString *)deviceKey {
+    PSCProgressGate *gate = self.progressGates[deviceKey];
+    if (!gate) {
+        gate = [[PSCProgressGate alloc] init];
+        self.progressGates[deviceKey] = gate;
+    }
+    return gate;
+}
+
+- (void)sendProgressJob:(NSString *)jobId
+              deviceKey:(NSString *)deviceKey
+                   done:(uint64_t)done
+                  count:(uint64_t)count
+                   rate:(double)rate {
+    PSCProgressGate *gate = [self progressGate:deviceKey];
+    gate.payload = @{
+        @"type" : @"progress",
+        @"jobId" : jobId,
+        @"deviceKey" : deviceKey,
+        @"done" : PSCFormatDec64(done),
+        @"count" : PSCFormatDec64(count),
+        @"rate" : @(rate),
+    };
+    NSTimeInterval wait = kPSCProgressInterval - ([NSDate date].timeIntervalSince1970 - gate.lastSent);
+    if (wait <= 0) {
+        [self flushProgress:deviceKey];
+        return;
+    }
+    if (!gate.timerPending) {
+        gate.timerPending = YES;
+        NSString *key = [deviceKey copy];
+        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(wait * NSEC_PER_SEC)), self.syncQueue, ^{
+            PSCProgressGate *live = self.progressGates[key];
+            live.timerPending = NO;
+            [self flushProgress:key];
+        });
+    }
+}
+
+- (void)flushProgress:(NSString *)deviceKey {
+    PSCProgressGate *gate = self.progressGates[deviceKey];
+    if (!gate.payload) {
+        return;
+    }
+    NSDictionary *payload = gate.payload;
+    PSCDeviceJob *live = self.jobs[deviceKey];
+    if (!live || ![live.jobId isEqualToString:payload[@"jobId"]]) {
+        gate.payload = nil;
+        return;
+    }
+    gate.payload = nil;
+    gate.lastSent = [NSDate date].timeIntervalSince1970;
+    [self send:payload];
+}
+
+- (void)clearProgressGate:(NSString *)deviceKey {
+    PSCProgressGate *gate = self.progressGates[deviceKey];
+    if (!gate) {
+        return;
+    }
+    gate.timerPending = NO;
+    gate.payload = nil;
+}
+
+- (void)emitWorkers {
+    NSMutableArray<PSCWorkerSnapshot *> *rows = [NSMutableArray array];
+    for (PSCComputeDevice *device in self.devices) {
+        PSCDeviceJob *live = self.jobs[device.key];
+        uint64_t done = live.done;
+        uint64_t count = live.count;
+        double pct = live && count > 0 ? (double)done * 100.0 / (double)count : 0;
+        PSCWorkerSnapshot *row = [[PSCWorkerSnapshot alloc] init];
+        row.deviceKey = device.key;
+        row.deviceName = device.name;
+        row.deviceType = device.type;
+        row.current = live ? [NSString stringWithFormat:@"%@ / %@", PSCFormatCount(done), PSCFormatCount(count)] : @"idle";
+        row.pct = pct;
+        row.completedBlocks = self.completedBlocks[device.key].integerValue;
+        row.rate = live.rate;
+        row.busy = live != nil;
+        [rows addObject:row];
+    }
+    NSArray *snapshot = [rows copy];
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [self.delegate slaveClient:self didUpdateWorkers:snapshot];
+    });
+}
+
+- (void)updateStatus {
+    NSArray<PSCDeviceJob *> *busy = self.jobs.allValues;
+    BOOL connected = self.task != nil;
+    if (busy.count == 0) {
+        [self notifyStatus:connected ? @"Idle" : @"Disconnected" connected:connected];
+        return;
+    }
+    if (busy.count == 1) {
+        PSCDeviceJob *job = busy.firstObject;
+        NSString *shortId = job.jobId.length > 8 ? [job.jobId substringToIndex:8] : job.jobId;
+        [self notifyStatus:[NSString stringWithFormat:@"Working  %@  %llu/%llu", shortId, (unsigned long long)job.done,
+                                                      (unsigned long long)job.count]
+                 connected:YES];
+        return;
+    }
+    [self notifyStatus:[NSString stringWithFormat:@"%lu workers assigned", (unsigned long)busy.count] connected:YES];
+}
+
+- (void)notifyStatus:(NSString *)status connected:(BOOL)connected {
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [self.delegate slaveClient:self didChangeStatus:status connected:connected];
+    });
+}
+
+- (void)log:(NSString *)line {
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [self.delegate slaveClient:self didLog:line];
+    });
+}
+
+@end
--- a/ios/DESCracker/UI/PSCSlaveViewController.h
+++ b/ios/DESCracker/UI/PSCSlaveViewController.h
@ -0,0 +1,5 @@
+#import <UIKit/UIKit.h>
+#import "PSCSlaveClient.h"
+
+@interface PSCSlaveViewController : UIViewController
+@end
--- a/ios/DESCracker/UI/PSCSlaveViewController.m
+++ b/ios/DESCracker/UI/PSCSlaveViewController.m
@ -0,0 +1,619 @@
+#import "PSCSlaveViewController.h"
+
+static NSString *const kPSCHostKey = @"psc.masterHost";
+static NSString *const kPSCPortKey = @"psc.masterPort";
+static NSString *const kPSCMetalKey = @"psc.metalOn";
+static NSString *const kPSCCpuKey = @"psc.cpuOn";
+static NSString *const kPSCWorkersKey = @"psc.cpuWorkers";
+
+static UIColor *PSCColorBG(void) {
+    return [UIColor colorWithRed:0x10 / 255.0 green:0x15 / 255.0 blue:0x1c / 255.0 alpha:1];
+}
+static UIColor *PSCColorCard(void) {
+    return [UIColor colorWithRed:0x17 / 255.0 green:0x1e / 255.0 blue:0x28 / 255.0 alpha:1];
+}
+static UIColor *PSCColorBorder(void) {
+    return [UIColor colorWithRed:0x2b / 255.0 green:0x35 / 255.0 blue:0x44 / 255.0 alpha:1];
+}
+static UIColor *PSCColorText(void) {
+    return [UIColor colorWithRed:0xe8 / 255.0 green:0xee / 255.0 blue:0xf4 / 255.0 alpha:1];
+}
+static UIColor *PSCColorMuted(void) {
+    return [UIColor colorWithRed:0x8b / 255.0 green:0x9a / 255.0 blue:0xab / 255.0 alpha:1];
+}
+static UIColor *PSCColorTeal(void) {
+    return [UIColor colorWithRed:0x5e / 255.0 green:0xea / 255.0 blue:0xd4 / 255.0 alpha:1];
+}
+static UIColor *PSCColorField(void) {
+    return [UIColor colorWithRed:0x0c / 255.0 green:0x11 / 255.0 blue:0x18 / 255.0 alpha:1];
+}
+
+@interface PSCWorkCard : UIView
+@property (nonatomic, strong) UILabel *nameLabel;
+@property (nonatomic, strong) UILabel *metaLabel;
+@property (nonatomic, strong) UIProgressView *progress;
+@property (nonatomic, copy) NSString *deviceKey;
+@end
+
+@implementation PSCWorkCard
+@end
+
+@interface PSCSlaveViewController () <PSCSlaveClientDelegate, UITextFieldDelegate>
+@property (nonatomic, strong) PSCSlaveClient *client;
+@property (nonatomic, strong) UIScrollView *scroll;
+@property (nonatomic, strong) UIStackView *stack;
+@property (nonatomic, strong) UILabel *statusPill;
+@property (nonatomic, strong) UITextField *hostField;
+@property (nonatomic, strong) UITextField *portField;
+@property (nonatomic, strong) UIButton *connectBtn;
+@property (nonatomic, strong) UIButton *disconnectBtn;
+@property (nonatomic, strong) UISwitch *metalSwitch;
+@property (nonatomic, strong) UISwitch *cpuSwitch;
+@property (nonatomic, strong) UILabel *metalNameLabel;
+@property (nonatomic, strong) UILabel *cpuNameLabel;
+@property (nonatomic, strong) UILabel *workersValue;
+@property (nonatomic, strong) UIStepper *workersStepper;
+@property (nonatomic, strong) UIStackView *workStack;
+@property (nonatomic, strong) UITextView *logView;
+@property (nonatomic, strong) NSMutableString *logText;
+@property (nonatomic, assign) BOOL metalReady;
+@end
+
+@implementation PSCSlaveViewController
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+    self.view.backgroundColor = PSCColorBG();
+    self.logText = [NSMutableString string];
+    self.client = [[PSCSlaveClient alloc] init];
+    self.client.delegate = self;
+
+    [self buildUI];
+    [self loadDefaults];
+    [self applyConnectionEnabled:YES];
+
+    NSError *err = nil;
+    BOOL ok = [self.client prepareEngines:&err];
+    self.metalReady = self.client.metalAvailable;
+    self.metalNameLabel.text = self.metalReady ? self.client.metalName : @"Metal GPU unavailable";
+    self.metalSwitch.enabled = self.metalReady;
+    if (!self.metalReady) {
+        self.metalSwitch.on = NO;
+    }
+    unsigned cores = (unsigned)self.client.cpuCores;
+    self.cpuNameLabel.text = [NSString stringWithFormat:@"CPU (%u cores)", cores];
+    self.workersStepper.minimumValue = 1;
+    self.workersStepper.maximumValue = MAX(1, cores);
+    if (self.workersStepper.value < 1 || self.workersStepper.value > cores) {
+        self.workersStepper.value = cores;
+    }
+    self.workersValue.text = [NSString stringWithFormat:@"%.0f", self.workersStepper.value];
+    self.client.cpuWorkers = (NSUInteger)self.workersStepper.value;
+
+    if (ok) {
+        [self appendLog:self.metalReady ? @"Metal and CPU self-tests passed." : @"CPU self-test passed. Metal unavailable."];
+    } else {
+        [self appendLog:[NSString stringWithFormat:@"Engine setup: %@", err.localizedDescription ?: @"failed"]];
+    }
+    [self rebuildDevices];
+    [self rebuildWorkCards:@[]];
+
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(appDidBackground)
+                                                 name:UIApplicationDidEnterBackgroundNotification
+                                               object:nil];
+}
+
+- (void)dealloc {
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
+}
+
+- (void)appDidBackground {
+    if (self.client.isConnected) {
+        [self.client disconnect];
+        [self applyConnectionEnabled:YES];
+        [self appendLog:@"Disconnected (app backgrounded)."];
+    }
+}
+
+- (UILabel *)caption:(NSString *)text {
+    UILabel *label = [[UILabel alloc] init];
+    label.text = text.uppercaseString;
+    label.textColor = PSCColorMuted();
+    label.font = [UIFont systemFontOfSize:11 weight:UIFontWeightBold];
+    return label;
+}
+
+- (UIView *)cardWithTitle:(NSString *)title arranged:(NSArray<UIView *> *)views {
+    UIStackView *inner = [[UIStackView alloc] init];
+    inner.axis = UILayoutConstraintAxisVertical;
+    inner.spacing = 10;
+    UILabel *titleLabel = [[UILabel alloc] init];
+    titleLabel.text = title;
+    titleLabel.textColor = PSCColorText();
+    titleLabel.font = [UIFont systemFontOfSize:15 weight:UIFontWeightSemibold];
+    [inner addArrangedSubview:titleLabel];
+    for (UIView *view in views) {
+        [inner addArrangedSubview:view];
+    }
+    UIView *card = [[UIView alloc] init];
+    card.backgroundColor = PSCColorCard();
+    card.layer.cornerRadius = 12;
+    card.layer.borderWidth = 1;
+    card.layer.borderColor = PSCColorBorder().CGColor;
+    inner.translatesAutoresizingMaskIntoConstraints = NO;
+    [card addSubview:inner];
+    [NSLayoutConstraint activateConstraints:@[
+        [inner.topAnchor constraintEqualToAnchor:card.topAnchor constant:14],
+        [inner.leadingAnchor constraintEqualToAnchor:card.leadingAnchor constant:14],
+        [inner.trailingAnchor constraintEqualToAnchor:card.trailingAnchor constant:-14],
+        [inner.bottomAnchor constraintEqualToAnchor:card.bottomAnchor constant:-14],
+    ]];
+    return card;
+}
+
+- (UITextField *)fieldWithPlaceholder:(NSString *)placeholder keyboard:(UIKeyboardType)keyboard {
+    UITextField *field = [[UITextField alloc] init];
+    field.placeholder = placeholder;
+    field.textColor = PSCColorText();
+    field.keyboardType = keyboard;
+    field.autocapitalizationType = UITextAutocapitalizationTypeNone;
+    field.autocorrectionType = UITextAutocorrectionTypeNo;
+    field.spellCheckingType = UITextSpellCheckingTypeNo;
+    field.delegate = self;
+    field.returnKeyType = UIReturnKeyDone;
+    field.font = [UIFont monospacedSystemFontOfSize:15 weight:UIFontWeightRegular];
+    field.backgroundColor = PSCColorField();
+    field.layer.cornerRadius = 8;
+    field.layer.borderWidth = 1;
+    field.layer.borderColor = PSCColorBorder().CGColor;
+    field.leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 1)];
+    field.leftViewMode = UITextFieldViewModeAlways;
+    field.rightView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 1)];
+    field.rightViewMode = UITextFieldViewModeAlways;
+    field.attributedPlaceholder = [[NSAttributedString alloc]
+        initWithString:placeholder
+            attributes:@{NSForegroundColorAttributeName : PSCColorMuted()}];
+    [field.heightAnchor constraintEqualToConstant:40].active = YES;
+    return field;
+}
+
+- (UIButton *)buttonTitle:(NSString *)title primary:(BOOL)primary action:(SEL)action {
+    UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
+    [btn setTitle:title forState:UIControlStateNormal];
+    btn.titleLabel.font = [UIFont systemFontOfSize:15 weight:UIFontWeightSemibold];
+    btn.layer.cornerRadius = 8;
+    [btn.heightAnchor constraintEqualToConstant:40].active = YES;
+    if (primary) {
+        btn.backgroundColor = PSCColorTeal();
+        [btn setTitleColor:PSCColorBG() forState:UIControlStateNormal];
+    } else {
+        btn.backgroundColor = PSCColorField();
+        btn.layer.borderWidth = 1;
+        btn.layer.borderColor = PSCColorBorder().CGColor;
+        [btn setTitleColor:PSCColorText() forState:UIControlStateNormal];
+    }
+    [btn addTarget:self action:action forControlEvents:UIControlEventTouchUpInside];
+    return btn;
+}
+
+- (UIView *)toggleRowSwitch:(UISwitch *)toggle name:(UILabel *)name {
+    UIStackView *row = [[UIStackView alloc] init];
+    row.axis = UILayoutConstraintAxisHorizontal;
+    row.alignment = UIStackViewAlignmentCenter;
+    row.spacing = 10;
+    name.textColor = PSCColorText();
+    name.font = [UIFont systemFontOfSize:14 weight:UIFontWeightMedium];
+    name.numberOfLines = 2;
+    toggle.onTintColor = PSCColorTeal();
+    [row addArrangedSubview:name];
+    [row addArrangedSubview:toggle];
+    [name setContentHuggingPriority:UILayoutPriorityDefaultLow forAxis:UILayoutConstraintAxisHorizontal];
+    [toggle setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisHorizontal];
+    return row;
+}
+
+- (void)buildUI {
+    self.scroll = [[UIScrollView alloc] init];
+    self.scroll.translatesAutoresizingMaskIntoConstraints = NO;
+    self.scroll.alwaysBounceVertical = YES;
+    self.scroll.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
+    [self.view addSubview:self.scroll];
+
+    self.stack = [[UIStackView alloc] init];
+    self.stack.axis = UILayoutConstraintAxisVertical;
+    self.stack.spacing = 16;
+    self.stack.translatesAutoresizingMaskIntoConstraints = NO;
+    [self.scroll addSubview:self.stack];
+
+    UILayoutGuide *safe = self.view.safeAreaLayoutGuide;
+    [NSLayoutConstraint activateConstraints:@[
+        [self.scroll.topAnchor constraintEqualToAnchor:safe.topAnchor],
+        [self.scroll.leadingAnchor constraintEqualToAnchor:self.view.leadingAnchor],
+        [self.scroll.trailingAnchor constraintEqualToAnchor:self.view.trailingAnchor],
+        [self.scroll.bottomAnchor constraintEqualToAnchor:self.view.bottomAnchor],
+        [self.stack.topAnchor constraintEqualToAnchor:self.scroll.contentLayoutGuide.topAnchor constant:16],
+        [self.stack.leadingAnchor constraintEqualToAnchor:self.scroll.frameLayoutGuide.leadingAnchor constant:16],
+        [self.stack.trailingAnchor constraintEqualToAnchor:self.scroll.frameLayoutGuide.trailingAnchor constant:-16],
+        [self.stack.bottomAnchor constraintEqualToAnchor:self.scroll.contentLayoutGuide.bottomAnchor constant:-24],
+    ]];
+
+    UIStackView *header = [[UIStackView alloc] init];
+    header.axis = UILayoutConstraintAxisHorizontal;
+    header.alignment = UIStackViewAlignmentCenter;
+    header.spacing = 12;
+
+    UIStackView *brand = [[UIStackView alloc] init];
+    brand.axis = UILayoutConstraintAxisVertical;
+    brand.spacing = 2;
+    UILabel *title = [[UILabel alloc] init];
+    title.text = @"DES Cracker";
+    title.textColor = PSCColorTeal();
+    title.font = [UIFont systemFontOfSize:22 weight:UIFontWeightBold];
+    UILabel *sub = [[UILabel alloc] init];
+    sub.text = @"LAN WORKER";
+    sub.textColor = PSCColorMuted();
+    sub.font = [UIFont systemFontOfSize:10 weight:UIFontWeightBold];
+    [brand addArrangedSubview:title];
+    [brand addArrangedSubview:sub];
+
+    self.statusPill = [[UILabel alloc] init];
+    self.statusPill.text = @"Offline";
+    self.statusPill.textAlignment = NSTextAlignmentCenter;
+    self.statusPill.textColor = PSCColorMuted();
+    self.statusPill.font = [UIFont systemFontOfSize:12 weight:UIFontWeightSemibold];
+    self.statusPill.backgroundColor = PSCColorField();
+    self.statusPill.layer.cornerRadius = 12;
+    self.statusPill.layer.masksToBounds = YES;
+    self.statusPill.layer.borderWidth = 1;
+    self.statusPill.layer.borderColor = PSCColorBorder().CGColor;
+    [self.statusPill.widthAnchor constraintGreaterThanOrEqualToConstant:96].active = YES;
+    [self.statusPill.heightAnchor constraintEqualToConstant:28].active = YES;
+    [header addArrangedSubview:brand];
+    [header addArrangedSubview:self.statusPill];
+    [brand setContentHuggingPriority:UILayoutPriorityDefaultLow forAxis:UILayoutConstraintAxisHorizontal];
+
+    self.hostField = [self fieldWithPlaceholder:@"192.168.1.10" keyboard:UIKeyboardTypeNumbersAndPunctuation];
+    self.portField = [self fieldWithPlaceholder:@"9876" keyboard:UIKeyboardTypeNumberPad];
+    [self.portField.widthAnchor constraintEqualToConstant:88].active = YES;
+    UIStackView *hostRow = [[UIStackView alloc] init];
+    hostRow.axis = UILayoutConstraintAxisHorizontal;
+    hostRow.spacing = 8;
+    UIStackView *hostCol = [[UIStackView alloc] init];
+    hostCol.axis = UILayoutConstraintAxisVertical;
+    hostCol.spacing = 4;
+    [hostCol addArrangedSubview:[self caption:@"Master host"]];
+    [hostCol addArrangedSubview:self.hostField];
+    UIStackView *portCol = [[UIStackView alloc] init];
+    portCol.axis = UILayoutConstraintAxisVertical;
+    portCol.spacing = 4;
+    [portCol addArrangedSubview:[self caption:@"Port"]];
+    [portCol addArrangedSubview:self.portField];
+    [hostRow addArrangedSubview:hostCol];
+    [hostRow addArrangedSubview:portCol];
+
+    self.connectBtn = [self buttonTitle:@"Connect" primary:YES action:@selector(connectTapped)];
+    self.disconnectBtn = [self buttonTitle:@"Disconnect" primary:NO action:@selector(disconnectTapped)];
+    UIStackView *btnRow = [[UIStackView alloc] init];
+    btnRow.axis = UILayoutConstraintAxisHorizontal;
+    btnRow.spacing = 8;
+    btnRow.distribution = UIStackViewDistributionFillEqually;
+    [btnRow addArrangedSubview:self.connectBtn];
+    [btnRow addArrangedSubview:self.disconnectBtn];
+
+    UIView *connectCard = [self cardWithTitle:@"Connection" arranged:@[ hostRow, btnRow ]];
+
+    self.metalSwitch = [[UISwitch alloc] init];
+    self.metalSwitch.on = YES;
+    [self.metalSwitch addTarget:self action:@selector(devicesChanged) forControlEvents:UIControlEventValueChanged];
+    self.metalNameLabel = [[UILabel alloc] init];
+    self.metalNameLabel.text = @"Metal GPU";
+    UIView *metalRow = [self toggleRowSwitch:self.metalSwitch name:self.metalNameLabel];
+
+    self.cpuSwitch = [[UISwitch alloc] init];
+    self.cpuSwitch.on = YES;
+    [self.cpuSwitch addTarget:self action:@selector(devicesChanged) forControlEvents:UIControlEventValueChanged];
+    self.cpuNameLabel = [[UILabel alloc] init];
+    self.cpuNameLabel.text = @"CPU";
+    UIView *cpuRow = [self toggleRowSwitch:self.cpuSwitch name:self.cpuNameLabel];
+
+    self.workersStepper = [[UIStepper alloc] init];
+    self.workersStepper.minimumValue = 1;
+    self.workersStepper.maximumValue = 16;
+    self.workersStepper.stepValue = 1;
+    self.workersStepper.value = 4;
+    [self.workersStepper addTarget:self action:@selector(workersChanged) forControlEvents:UIControlEventValueChanged];
+    self.workersValue = [[UILabel alloc] init];
+    self.workersValue.textColor = PSCColorText();
+    self.workersValue.font = [UIFont monospacedDigitSystemFontOfSize:14 weight:UIFontWeightMedium];
+    UIStackView *workerRow = [[UIStackView alloc] init];
+    workerRow.axis = UILayoutConstraintAxisHorizontal;
+    workerRow.alignment = UIStackViewAlignmentCenter;
+    workerRow.spacing = 8;
+    UILabel *workersCaption = [[UILabel alloc] init];
+    workersCaption.text = @"CPU workers";
+    workersCaption.textColor = PSCColorMuted();
+    workersCaption.font = [UIFont systemFontOfSize:13 weight:UIFontWeightMedium];
+    [workerRow addArrangedSubview:workersCaption];
+    [workerRow addArrangedSubview:[[UIView alloc] init]];
+    [workerRow addArrangedSubview:self.workersValue];
+    [workerRow addArrangedSubview:self.workersStepper];
+
+    UILabel *hint = [[UILabel alloc] init];
+    hint.text = @"Block size is set on the master. This device only exposes workers.";
+    hint.textColor = PSCColorMuted();
+    hint.font = [UIFont systemFontOfSize:12];
+    hint.numberOfLines = 0;
+
+    UIView *deviceCard = [self cardWithTitle:@"Devices" arranged:@[ metalRow, cpuRow, workerRow, hint ]];
+
+    self.workStack = [[UIStackView alloc] init];
+    self.workStack.axis = UILayoutConstraintAxisVertical;
+    self.workStack.spacing = 10;
+    UIView *workCard = [self cardWithTitle:@"Assigned work" arranged:@[ self.workStack ]];
+
+    self.logView = [[UITextView alloc] init];
+    self.logView.editable = NO;
+    self.logView.backgroundColor = PSCColorField();
+    self.logView.textColor = PSCColorText();
+    self.logView.font = [UIFont monospacedSystemFontOfSize:11 weight:UIFontWeightRegular];
+    self.logView.layer.cornerRadius = 8;
+    self.logView.layer.borderWidth = 1;
+    self.logView.layer.borderColor = PSCColorBorder().CGColor;
+    self.logView.textContainerInset = UIEdgeInsetsMake(8, 6, 8, 6);
+    [self.logView.heightAnchor constraintEqualToConstant:180].active = YES;
+    UIView *logCard = [self cardWithTitle:@"Log" arranged:@[ self.logView ]];
+
+    [self.stack addArrangedSubview:header];
+    [self.stack addArrangedSubview:connectCard];
+    [self.stack addArrangedSubview:deviceCard];
+    [self.stack addArrangedSubview:workCard];
+    [self.stack addArrangedSubview:logCard];
+}
+
+- (void)loadDefaults {
+    NSUserDefaults *defaults = NSUserDefaults.standardUserDefaults;
+    NSString *host = [defaults stringForKey:kPSCHostKey];
+    self.hostField.text = host.length ? host : @"";
+    NSInteger port = [defaults integerForKey:kPSCPortKey];
+    self.portField.text = port > 0 ? [NSString stringWithFormat:@"%ld", (long)port] : @"9876";
+    if ([defaults objectForKey:kPSCMetalKey] != nil) {
+        self.metalSwitch.on = [defaults boolForKey:kPSCMetalKey];
+    }
+    if ([defaults objectForKey:kPSCCpuKey] != nil) {
+        self.cpuSwitch.on = [defaults boolForKey:kPSCCpuKey];
+    }
+    NSInteger workers = [defaults integerForKey:kPSCWorkersKey];
+    if (workers > 0) {
+        self.workersStepper.value = workers;
+    }
+}
+
+- (void)saveDefaults {
+    NSUserDefaults *defaults = NSUserDefaults.standardUserDefaults;
+    [defaults setObject:self.hostField.text ?: @"" forKey:kPSCHostKey];
+    [defaults setInteger:self.portField.text.integerValue forKey:kPSCPortKey];
+    [defaults setBool:self.metalSwitch.on forKey:kPSCMetalKey];
+    [defaults setBool:self.cpuSwitch.on forKey:kPSCCpuKey];
+    [defaults setInteger:(NSInteger)self.workersStepper.value forKey:kPSCWorkersKey];
+}
+
+- (void)applyConnectionEnabled:(BOOL)canConnect {
+    self.connectBtn.enabled = canConnect;
+    self.connectBtn.alpha = canConnect ? 1 : 0.45;
+    self.disconnectBtn.enabled = !canConnect;
+    self.disconnectBtn.alpha = canConnect ? 0.45 : 1;
+    self.hostField.enabled = canConnect;
+    self.portField.enabled = canConnect;
+}
+
+- (NSArray<PSCComputeDevice *> *)selectedDevices {
+    NSMutableArray<PSCComputeDevice *> *devices = [NSMutableArray array];
+    if (self.metalSwitch.on && self.metalReady) {
+        PSCComputeDevice *gpu = [[PSCComputeDevice alloc] init];
+        gpu.key = @"metal:0";
+        gpu.deviceId = 0;
+        gpu.name = self.client.metalName ?: @"Metal GPU";
+        gpu.type = @"metal";
+        if (self.client.metalMemory > 0) {
+            gpu.memory = @(self.client.metalMemory);
+        }
+        [devices addObject:gpu];
+    }
+    if (self.cpuSwitch.on) {
+        PSCComputeDevice *cpu = [[PSCComputeDevice alloc] init];
+        cpu.key = @"cpu:0";
+        cpu.deviceId = 0;
+        cpu.name = [NSString stringWithFormat:@"CPU (%lu cores)", (unsigned long)self.client.cpuCores];
+        cpu.type = @"cpu";
+        cpu.cores = @(self.client.cpuCores);
+        [devices addObject:cpu];
+    }
+    return devices;
+}
+
+- (void)rebuildDevices {
+    self.client.cpuWorkers = (NSUInteger)self.workersStepper.value;
+    [self.client setDevices:[self selectedDevices]];
+}
+
+- (void)rebuildWorkCards:(NSArray<PSCWorkerSnapshot *> *)workers {
+    for (UIView *view in self.workStack.arrangedSubviews) {
+        [self.workStack removeArrangedSubview:view];
+        [view removeFromSuperview];
+    }
+    if (workers.count == 0) {
+        NSArray *selected = [self selectedDevices];
+        if (selected.count == 0) {
+            UILabel *empty = [[UILabel alloc] init];
+            empty.text = @"Enable Metal and/or CPU to expose workers.";
+            empty.textColor = PSCColorMuted();
+            empty.font = [UIFont systemFontOfSize:13];
+            empty.numberOfLines = 0;
+            [self.workStack addArrangedSubview:empty];
+            return;
+        }
+        NSMutableArray *idle = [NSMutableArray array];
+        for (PSCComputeDevice *device in selected) {
+            PSCWorkerSnapshot *row = [[PSCWorkerSnapshot alloc] init];
+            row.deviceKey = device.key;
+            row.deviceName = device.name;
+            row.deviceType = device.type;
+            row.current = @"idle";
+            [idle addObject:row];
+        }
+        workers = idle;
+    }
+    for (PSCWorkerSnapshot *row in workers) {
+        PSCWorkCard *card = [[PSCWorkCard alloc] init];
+        card.deviceKey = row.deviceKey;
+        UILabel *name = [[UILabel alloc] init];
+        name.text = row.deviceName;
+        name.textColor = PSCColorText();
+        name.font = [UIFont systemFontOfSize:14 weight:UIFontWeightSemibold];
+        UILabel *meta = [[UILabel alloc] init];
+        meta.textColor = PSCColorMuted();
+        meta.font = [UIFont monospacedDigitSystemFontOfSize:12 weight:UIFontWeightRegular];
+        meta.numberOfLines = 2;
+        UIProgressView *progress = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
+        progress.progressTintColor = PSCColorTeal();
+        progress.trackTintColor = PSCColorBorder();
+        card.nameLabel = name;
+        card.metaLabel = meta;
+        card.progress = progress;
+        UIStackView *col = [[UIStackView alloc] initWithArrangedSubviews:@[ name, progress, meta ]];
+        col.axis = UILayoutConstraintAxisVertical;
+        col.spacing = 6;
+        col.translatesAutoresizingMaskIntoConstraints = NO;
+        [card addSubview:col];
+        [NSLayoutConstraint activateConstraints:@[
+            [col.topAnchor constraintEqualToAnchor:card.topAnchor],
+            [col.leadingAnchor constraintEqualToAnchor:card.leadingAnchor],
+            [col.trailingAnchor constraintEqualToAnchor:card.trailingAnchor],
+            [col.bottomAnchor constraintEqualToAnchor:card.bottomAnchor],
+        ]];
+        [self.workStack addArrangedSubview:card];
+        [self applySnapshot:row toCard:card];
+    }
+}
+
+- (void)applySnapshot:(PSCWorkerSnapshot *)row toCard:(PSCWorkCard *)card {
+    card.nameLabel.text = row.deviceName;
+    card.progress.progress = (float)(row.pct / 100.0);
+    NSString *rate = row.busy ? PSCFormatRate(row.rate) : @"—";
+    card.metaLabel.text = [NSString stringWithFormat:@"%@   %@   %ld blocks", row.current, rate, (long)row.completedBlocks];
+}
+
+- (void)connectTapped {
+    [self.view endEditing:YES];
+    NSString *host = [self.hostField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
+    NSInteger port = self.portField.text.integerValue;
+    if (host.length == 0) {
+        [self appendLog:@"Enter the master’s IP address."];
+        return;
+    }
+    if (port <= 0 || port > 65535) {
+        port = kPSCDefaultPort;
+        self.portField.text = [NSString stringWithFormat:@"%ld", (long)port];
+    }
+    if ([self selectedDevices].count == 0) {
+        [self appendLog:@"Enable at least one device before connecting."];
+        return;
+    }
+    [self saveDefaults];
+    [self rebuildDevices];
+    [self applyConnectionEnabled:NO];
+    [self.client connectToHost:host port:port];
+}
+
+- (void)disconnectTapped {
+    [self.client disconnect];
+    [self applyConnectionEnabled:YES];
+}
+
+- (void)devicesChanged {
+    [self saveDefaults];
+    [self rebuildDevices];
+}
+
+- (void)workersChanged {
+    self.workersValue.text = [NSString stringWithFormat:@"%.0f", self.workersStepper.value];
+    [self saveDefaults];
+    [self rebuildDevices];
+}
+
+- (void)appendLog:(NSString *)line {
+    NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
+    fmt.dateFormat = @"HH:mm:ss";
+    NSString *stamp = [fmt stringFromDate:[NSDate date]];
+    [self.logText appendFormat:@"[%@] %@\n", stamp, line];
+    self.logView.text = self.logText;
+    if (self.logView.text.length > 0) {
+        NSRange bottom = NSMakeRange(self.logView.text.length - 1, 1);
+        [self.logView scrollRangeToVisible:bottom];
+    }
+}
+
+- (void)setStatus:(NSString *)status connected:(BOOL)connected {
+    self.statusPill.text = [NSString stringWithFormat:@"  %@  ", status];
+    if (connected) {
+        self.statusPill.textColor = PSCColorBG();
+        self.statusPill.backgroundColor = PSCColorTeal();
+        self.statusPill.layer.borderColor = PSCColorTeal().CGColor;
+    } else {
+        self.statusPill.textColor = PSCColorMuted();
+        self.statusPill.backgroundColor = PSCColorField();
+        self.statusPill.layer.borderColor = PSCColorBorder().CGColor;
+    }
+    if ([status isEqualToString:@"Disconnected"] || [status isEqualToString:@"Offline"]) {
+        [self applyConnectionEnabled:YES];
+    }
+}
+
+- (BOOL)textFieldShouldReturn:(UITextField *)textField {
+    [textField resignFirstResponder];
+    return YES;
+}
+
+#pragma mark - PSCSlaveClientDelegate
+
+- (void)slaveClient:(PSCSlaveClient *)client didChangeStatus:(NSString *)status connected:(BOOL)connected {
+    (void)client;
+    [self setStatus:status connected:connected];
+    [UIApplication sharedApplication].idleTimerDisabled = connected;
+}
+
+- (void)slaveClient:(PSCSlaveClient *)client didLog:(NSString *)line {
+    (void)client;
+    [self appendLog:line];
+}
+
+- (void)slaveClient:(PSCSlaveClient *)client didUpdateWorkers:(NSArray<PSCWorkerSnapshot *> *)workers {
+    (void)client;
+    if (self.workStack.arrangedSubviews.count != workers.count) {
+        [self rebuildWorkCards:workers];
+        return;
+    }
+    for (NSUInteger i = 0; i < workers.count; i++) {
+        UIView *view = self.workStack.arrangedSubviews[i];
+        if (![view isKindOfClass:[PSCWorkCard class]]) {
+            [self rebuildWorkCards:workers];
+            return;
+        }
+        PSCWorkCard *card = (PSCWorkCard *)view;
+        PSCWorkerSnapshot *row = workers[i];
+        if (![card.deviceKey isEqualToString:row.deviceKey]) {
+            [self rebuildWorkCards:workers];
+            return;
+        }
+        [self applySnapshot:row toCard:card];
+    }
+}
+
+- (void)slaveClient:(PSCSlaveClient *)client didHitJob:(NSString *)jobId index:(NSString *)index keyHex:(NSString *)keyHex {
+    (void)client;
+    (void)jobId;
+    [self appendLog:[NSString stringWithFormat:@"HIT index=%@ key=%@", index, keyHex]];
+}
+
+@end
--- a/ios/DESCracker/main.m
+++ b/ios/DESCracker/main.m
@ -0,0 +1,8 @@
+#import <UIKit/UIKit.h>
+#import "AppDelegate.h"
+
+int main(int argc, char *argv[]) {
+    @autoreleasepool {
+        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+    }
+}
--- a/src/net/slave.ts
+++ b/src/net/slave.ts
@ -4,9 +4,19 @@ import type { ComputeDevice } from "../search/nativeRunner";
 import { preferredDevice, runBrute } from "../search/nativeRunner";
 import { localWorkerId, type WorkerRow } from "../search/orchestrator";
 import { formatNumber, formatRate } from "../search/planner";
-import { decodeMsg, encodeMsg, type AssignBlock, type ServerMessage } from "./protocol";
+import { decodeMsg, encodeMsg, type AssignBlock, type ClientMessage, type ServerMessage } from "./protocol";
 import { WebSocket } from "ws";

+const WS_PROGRESS_INTERVAL_MS = 500;
+
+type ProgressPayload = Extract<ClientMessage, { type: "progress" }>;
+
+interface ProgressGate {
+  lastSent: number;
+  timer: NodeJS.Timeout | null;
+  payload: ProgressPayload | null;
+}
+
 export interface SlaveEvents {
  onLog?: (line: string) => void;
  onStatus?: (text: string) => void;
@ -28,6 +38,7 @@ export class SlaveClient {
  private ping: NodeJS.Timeout | null = null;
  private jobs = new Map<string, DeviceJob>();
  private completedBlocks = new Map<string, number>();
+  private progressGates = new Map<string, ProgressGate>();
  private rateStats = new Map<string, { keysDone: bigint; activeMs: number; busyStarted: number | null }>();
  private devices: ComputeDevice[] = [];
  private cpuWorkers = Math.max(1, os.cpus().length);
@ -157,6 +168,7 @@ export class SlaveClient {
    for (const [deviceKey, job] of this.jobs) {
      this.endRate(deviceKey, job.done);
      job.kill();
+      this.clearProgressGate(deviceKey);
    }
    this.jobs.clear();
  }
@ -174,6 +186,66 @@ export class SlaveClient {
    }
  }

+  private progressGate(deviceKey: string): ProgressGate {
+    let gate = this.progressGates.get(deviceKey);
+    if (!gate) {
+      gate = { lastSent: 0, timer: null, payload: null };
+      this.progressGates.set(deviceKey, gate);
+    }
+    return gate;
+  }
+
+  private sendProgress(jobId: string, deviceKey: string, done: bigint, count: bigint, rate: number): void {
+    const gate = this.progressGate(deviceKey);
+    gate.payload = {
+      type: "progress",
+      jobId,
+      deviceKey,
+      done: done.toString(),
+      count: count.toString(),
+      rate,
+    };
+    const wait = WS_PROGRESS_INTERVAL_MS - (Date.now() - gate.lastSent);
+    if (wait <= 0) {
+      this.flushProgress(deviceKey);
+      return;
+    }
+    if (!gate.timer) {
+      gate.timer = setTimeout(() => {
+        gate.timer = null;
+        this.flushProgress(deviceKey);
+      }, wait);
+    }
+  }
+
+  private flushProgress(deviceKey: string): void {
+    const gate = this.progressGates.get(deviceKey);
+    if (!gate?.payload) {
+      return;
+    }
+    const payload = gate.payload;
+    const live = this.jobs.get(deviceKey);
+    if (!live || live.jobId !== payload.jobId) {
+      gate.payload = null;
+      return;
+    }
+    gate.payload = null;
+    gate.lastSent = Date.now();
+    this.send(payload);
+  }
+
+  private clearProgressGate(deviceKey: string): void {
+    const gate = this.progressGates.get(deviceKey);
+    if (!gate) {
+      return;
+    }
+    if (gate.timer) {
+      clearTimeout(gate.timer);
+      gate.timer = null;
+    }
+    gate.payload = null;
+  }
+
  private emitWorkers(): void {
    const host = os.hostname();
    const rows: WorkerRow[] = this.devices.map((device) => {
@ -250,6 +322,7 @@ export class SlaveClient {
      this.events.onLog?.(`No device ${block.deviceKey}; using ${device.name}`);
    }
    this.jobs.get(device.key)?.kill();
+    this.clearProgressGate(device.key);
    this.events.onLog?.(
      `Assigned ${device.name}  len=${block.keyLen} pad=0x${block.padByte.toString(16).padStart(2, "0")} ` +
        `start=${block.start} count=${block.count}`,
@ -276,14 +349,7 @@ export class SlaveClient {
            live.count = count;
            live.rate = rate;
          }
-          this.send({
-            type: "progress",
-            jobId: block.jobId,
-            deviceKey: device.key,
-            done: done.toString(),
-            count: count.toString(),
-            rate,
-          });
+          this.sendProgress(block.jobId, device.key, done, count, rate);
          this.events.onProgress?.(block.jobId, done, count, rate);
          this.updateStatus();
          this.emitWorkers();
@ -319,6 +385,7 @@ export class SlaveClient {
        this.jobs.delete(device.key);
        this.endRate(device.key, BigInt(block.count));
        this.completedBlocks.set(device.key, (this.completedBlocks.get(device.key) ?? 0) + 1);
+        this.clearProgressGate(device.key);
        this.send({
          type: "block_complete",
          jobId: block.jobId,
@ -335,6 +402,7 @@ export class SlaveClient {
        const live = this.jobs.get(device.key);
        this.endRate(device.key, live?.done ?? 0n);
        this.jobs.delete(device.key);
+        this.clearProgressGate(device.key);
      }
      this.send({ type: "error", jobId: block.jobId, message });
      this.events.onLog?.(message);
--- a/src/search/orchestrator.ts
+++ b/src/search/orchestrator.ts
@ -72,30 +72,53 @@ export interface WorkerRow {
  busy: boolean;
 }

+interface KeyRange {
+  start: bigint;
+  count: bigint;
+}
+
+interface ReservedBlock extends KeyRange {
+  workerId: string;
+}
+
 class BlockAllocator {
  private next = 0n;
-  private inflight = new Map<string, { start: bigint; count: bigint }>();
-  private retries: Array<{ start: bigint; count: bigint }> = [];
+  private inflight = new Map<string, ReservedBlock>();
+  private retries: KeyRange[] = [];
  completed = 0n;

  constructor(readonly space: bigint) {}

-  take(blockSize: bigint): { jobId: string; start: bigint; count: bigint } | null {
+  private leftover(): bigint {
+    return this.next >= this.space ? 0n : this.space - this.next;
+  }
+
+  /** Next unallocated slice, reserved for `workerId` until complete/fail. */
+  take(
+    workerId: string,
+    blockSize: bigint,
+    otherIdle = 0,
+  ): { jobId: string; start: bigint; count: bigint } | null {
    const queued = this.retries.shift();
    if (queued) {
      const jobId = randomUUID();
-      this.inflight.set(jobId, queued);
+      this.inflight.set(jobId, { ...queued, workerId });
      return { jobId, ...queued };
    }
-    if (this.next >= this.space) {
+    const leftover = this.leftover();
+    if (leftover <= 0n) {
      return null;
    }
-    const size = blockSize < 1n ? 1n : blockSize;
+    const wanted = blockSize < 1n ? 1n : blockSize;
+    let count = wanted < leftover ? wanted : leftover;
+    if (count === leftover && otherIdle > 0 && leftover > 1n) {
+      const share = leftover / BigInt(otherIdle + 1);
+      count = share > 0n ? share : 1n;
+    }
    const start = this.next;
-    const count = size < this.space - start ? size : this.space - start;
    this.next += count;
    const jobId = randomUUID();
-    this.inflight.set(jobId, { start, count });
+    this.inflight.set(jobId, { start, count, workerId });
    return { jobId, start, count };
  }

@ -114,7 +137,7 @@ class BlockAllocator {
      return;
    }
    this.inflight.delete(jobId);
-    this.retries.push(block);
+    this.retries.push({ start: block.start, count: block.count });
  }

  get finished(): boolean {
@ -194,6 +217,7 @@ export class MasterSearch {
  private stageTotal = 1n;
  private stage: StageJob | null = null;
  private dispatch: (() => void) | null = null;
+  private feedWorker: ((worker: TrackedWorker) => boolean) | null = null;
  private stageAlloc: BlockAllocator | null = null;

  constructor(
@ -252,6 +276,7 @@ export class MasterSearch {
      }
      this.unsub = [];
      this.dispatch = null;
+      this.feedWorker = null;
    }

    const elapsed = (Date.now() - this.started) / 1000;
@ -350,6 +375,9 @@ export class MasterSearch {
      }
      this.stageAlloc?.complete(jobId);
      this.emitProgress();
+      if (tracked) {
+        this.feedWorker?.(tracked);
+      }
      this.dispatch?.();
    };
    this.server.events.onDropped = (slave, jobId) => {
@ -410,39 +438,41 @@ export class MasterSearch {
      }
    };

-    const dispatch = () => {
-      if (this.cancel) {
-        checkDone();
-        return;
-      }
+    const idleWorkers = (): TrackedWorker[] => {
+      const idle: TrackedWorker[] = [];
      for (const device of this.params.devices) {
        if (!localIdle.has(device.key)) {
          continue;
        }
        const worker = this.roster.get(localWorkerId(device.key));
-        if (!worker) {
-          continue;
+        if (worker && !worker.busy) {
+          idle.push(worker);
        }
-        const block = alloc.take(this.sizeFor(worker));
-        if (!block) {
-          break;
-        }
-        localIdle.delete(device.key);
-        this.startLocal(device, job, block, data, firstCt, alloc, localIdle, dispatch, checkDone);
      }
      if (this.server) {
        for (const remote of this.server.idleWorkers()) {
          const worker = this.roster.get(remoteWorkerId(remote.slaveId, remote.device.key));
-          if (!worker) {
-            continue;
+          if (worker && !worker.busy) {
+            idle.push(worker);
          }
-          const block = alloc.take(this.sizeFor(worker));
+        }
+      }
+      return idle;
+    };
+
+    const feedWorker = (worker: TrackedWorker): boolean => {
+      if (this.cancel || worker.busy) {
+        return false;
+      }
+      const others = idleWorkers().filter((w) => w.id !== worker.id).length;
+      const block = alloc.take(worker.id, this.sizeFor(worker), others);
      if (!block) {
-            break;
+        return false;
      }
-          const ok = this.server.assign(remote.slaveId, remote.device.key, {
+      if (worker.slaveId && this.server) {
+        const ok = this.server.assign(worker.slaveId, worker.deviceKey, {
          jobId: block.jobId,
-            deviceKey: remote.device.key,
+          deviceKey: worker.deviceKey,
          start: block.start.toString(),
          count: block.count.toString(),
          keyLen: job.length,
@ -450,19 +480,37 @@ export class MasterSearch {
          padByte: job.pad,
          target: PAD_CT.toString("hex"),
          fills: FILL_HEX,
-            cpuWorkers: remote.device.type === "cpu" ? this.params.cpuWorkersFor(worker.id) : undefined,
+          cpuWorkers: worker.deviceType === "cpu" ? this.params.cpuWorkersFor(worker.id) : undefined,
        });
        if (!ok) {
          alloc.fail(block.jobId);
-          } else {
+          return false;
+        }
        worker.jobId = block.jobId;
        worker.busy = true;
        worker.done = 0n;
        worker.count = block.count;
        worker.rate = 0;
        beginWork(worker);
+        return true;
      }
+      const device = this.params.devices.find((d) => d.key === worker.deviceKey);
+      if (!device || !localIdle.has(device.key)) {
+        alloc.fail(block.jobId);
+        return false;
      }
+      localIdle.delete(device.key);
+      this.startLocal(device, job, block, data, firstCt, alloc, localIdle, checkDone);
+      return true;
+    };
+
+    const dispatch = () => {
+      if (this.cancel) {
+        checkDone();
+        return;
+      }
+      for (const worker of idleWorkers()) {
+        feedWorker(worker);
      }
      this.emitProgress();
      const hasRemote = !!this.server && this.server.listWorkers().length > 0;
@ -480,10 +528,12 @@ export class MasterSearch {
      checkDone();
    };

+    this.feedWorker = feedWorker;
    this.dispatch = dispatch;
    dispatch();
    await finished;
    this.dispatch = null;
+    this.feedWorker = null;
    this.stageAlloc = null;
    this.stageCompleted = job.space;
    this.emitProgress();
@ -497,7 +547,6 @@ export class MasterSearch {
    firstCt: Buffer,
    alloc: BlockAllocator,
    localIdle: Set<string>,
-    dispatch: () => void,
    checkDone: () => void,
  ): void {
    const id = localWorkerId(device.key);
@ -576,7 +625,10 @@ export class MasterSearch {
        }
        this.stageCompleted = alloc.completed;
        this.emitProgress();
-        dispatch();
+        if (keepDevice && live && !this.cancel) {
+          this.feedWorker?.(live);
+        }
+        this.dispatch?.();
        checkDone();
      });
  }