keychain/trust/TrustedPeersTests/TPDummySigningKey.m

   1 /*
   2  * Copyright (c) 2017 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #import "TPDummySigningKey.h"
  25
  26 @interface TPDummySigningKey ()
  27 @property (nonatomic, strong) NSData *publicKey;
  28 @end
  29
  30
  31 @implementation TPDummySigningKey
  32
  33 - (instancetype)initWithPublicKeyData:(NSData *)publicKey
  34 {
  35     self = [super init];
  36     if (self) {
  37         _publicKey = publicKey;
  38         _privateKeyIsAvailable = YES;
  39     }
  40     return self;
  41 }
  42
  43 - (NSData *)signatureForData:(NSData *)data withError:(NSError **)error
  44 {
  45     if (self.privateKeyIsAvailable) {
  46         return [self signatureForData:data];
  47     } else {
  48         if (error) {
  49             *error = [NSError errorWithDomain:@"TPDummySigningKey" code:1 userInfo:nil];
  50         }
  51         return nil;
  52     }
  53 }
  54
  55 - (NSData *)signatureForData:(NSData *)data
  56 {
  57     // A really dumb hash that is just good enough for unit tests.
  58     NSUInteger hash = [self.publicKey hash] ^ [data hash];
  59     return [NSData dataWithBytes:&hash length:sizeof(hash)];
  60 }
  61
  62 - (BOOL)checkSignature:(NSData *)sig matchesData:(NSData *)data
  63 {
  64     return [sig isEqualToData:[self signatureForData:data]];
  65 }
  66
  67 @end
  68
  69
  70 @implementation TPDummySigningKeyFactory
  71
  72 - (id <TPSigningKey>)keyWithPublicKeyData:(NSData *)publicKey
  73 {
  74     if (0 == publicKey.length) {
  75         return nil;
  76     }
  77     return [[TPDummySigningKey alloc] initWithPublicKeyData:publicKey];
  78 }
  79
  80 + (instancetype) dummySigningKeyFactory
  81 {
  82     return [[TPDummySigningKeyFactory alloc] init];
  83 }
  84
  85 @end