Print all the existing keys in the iOS keychain

KeychainPrinter.m

+ (void)showKeychainKeys {
    NSMutableDictionary *query = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                                          (__bridge id)kCFBooleanTrue, (__bridge id)kSecReturnAttributes,
                                                          (__bridge id)kSecMatchLimitAll, (__bridge id)kSecMatchLimit,
                                                          nil];

    NSArray *secItemClasses = [NSArray arrayWithObjects:
                                           (__bridge id)kSecClassGenericPassword,
                                           (__bridge id)kSecClassInternetPassword,
                                           (__bridge id)kSecClassCertificate,
                                           (__bridge id)kSecClassKey,
                                           (__bridge id)kSecClassIdentity,
                                           nil];

    for (id secItemClass in secItemClasses) {
        [query setObject:secItemClass forKey:(__bridge id)kSecClass];

        CFTypeRef result = NULL;
        SecItemCopyMatching((__bridge CFDictionaryRef)query, &result);
        NSLog(@"RESULT %@", (__bridge id)result);
        if (result != NULL) CFRelease(result);
    }
}