EmbeddedOSSupport.m

/**
 * EmbeddedOSSupport.m
 * Support for embedded OS operations (T2 chip, biometrics)
 *
 * Uses private frameworks:
 * - BiometricKit
 * - NearField (for NFC/Secure Element)
 */

#import "EmbeddedOSSupport.h"

// Private framework class declarations
@class BKDeviceManager;
@class BKDevice;
@class BKDeviceDescriptor;
@class NFHardwareManager;
@class NFSecureElementManagerSession;

@implementation EmbeddedOSSupport

- (void)clearEmbeddedSystem {
    // Clear NFC Secure Element applets
    Class NFHardwareManagerClass = NSClassFromString(@"NFHardwareManager");
    if (NFHardwareManagerClass) {
        id hwManager = [NFHardwareManagerClass performSelector:@selector(sharedManager)];

        // Get Secure Element session
        Class NFSESessionClass = NSClassFromString(@"NFSecureElementManagerSession");
        if (NFSESessionClass) {
            id session = [[NFSESessionClass alloc] init];

            // Clear all applets - uses completion handler
            SEL clearSelector = NSSelectorFromString(@"clearAllAppletsWithCompletion:");
            if ([session respondsToSelector:clearSelector]) {
                void (^completion)(NFSecureElementManagerSession *, NSError *) =
                    ^(NFSecureElementManagerSession *sess, NSError *error) {
                        if (error) {
                            NSLog(@"Error clearing applets: %@", error);
                        } else {
                            NSLog(@"ClearingAllApplets completed");
                        }
                    };

                NSMethodSignature *sig = [session methodSignatureForSelector:clearSelector];
                NSInvocation *inv = [NSInvocation invocationWithMethodSignature:sig];
                [inv setTarget:session];
                [inv setSelector:clearSelector];
                [inv setArgument:&completion atIndex:2];
                [inv invoke];
            }
        }
    }
}

- (NSError *)disableBiometricID {
    // Use BiometricKit to disable biometric authentication
    Class BKDeviceManagerClass = NSClassFromString(@"BKDeviceManager");
    if (!BKDeviceManagerClass) {
        return [NSError errorWithDomain:@"EmbeddedOSSupport"
                                   code:-1
                               userInfo:@{NSLocalizedDescriptionKey: @"BiometricKit not available"}];
    }

    id deviceManager = [BKDeviceManagerClass performSelector:@selector(sharedManager)];

    // Get device descriptor for biometric device
    Class BKDeviceDescriptorClass = NSClassFromString(@"BKDeviceDescriptor");
    id descriptor = [[BKDeviceDescriptorClass alloc] init];

    // Get the device
    SEL deviceSelector = NSSelectorFromString(@"deviceForDescriptor:");
    if ([deviceManager respondsToSelector:deviceSelector]) {
        id device = [deviceManager performSelector:deviceSelector withObject:descriptor];

        if (device) {
            // Disable biometry on the device
            SEL disableSelector = NSSelectorFromString(@"disableBiometry");
            if ([device respondsToSelector:disableSelector]) {
                [device performSelector:disableSelector];
                return nil; // Success
            }
        }
    }

    return [NSError errorWithDomain:@"EmbeddedOSSupport"
                               code:-2
                           userInfo:@{NSLocalizedDescriptionKey: @"Couldn't disable biometry"}];
}

- (NSNumber *)bioLockState {
    // Check biometric lock state using LocalAuthentication or BiometricKit
    Class BKDeviceManagerClass = NSClassFromString(@"BKDeviceManager");
    if (!BKDeviceManagerClass) {
        return nil;
    }

    id deviceManager = [BKDeviceManagerClass performSelector:@selector(sharedManager)];

    // Get bioLock state
    SEL stateSelector = NSSelectorFromString(@"bioLockState");
    if ([deviceManager respondsToSelector:stateSelector]) {
        id state = [deviceManager performSelector:stateSelector];
        if ([state isKindOfClass:[NSNumber class]]) {
            return state;
        }
    }

    return nil;
}

@end