keychain/trust/TrustedPeers/TPPeerDynamicInfo.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 "TPPeerDynamicInfo.h"
  25 #import "TPUtils.h"
  26
  27 static const NSString *kCircleID = @"circleID";
  28 static const NSString *kClique = @"clique";
  29 static const NSString *kRemovals = @"removals";
  30 static const NSString *kClock = @"clock";
  31
  32
  33 @interface TPPeerDynamicInfo ()
  34
  35 @property (nonatomic, strong) NSString *circleID;
  36 @property (nonatomic, strong) NSString *clique;
  37 @property (nonatomic, assign) TPCounter removals;
  38 @property (nonatomic, assign) TPCounter clock;
  39 @property (nonatomic, strong) NSData *dynamicInfoPList;
  40 @property (nonatomic, strong) NSData *dynamicInfoSig;
  41
  42 @end
  43
  44
  45 @implementation TPPeerDynamicInfo
  46
  47 + (instancetype)dynamicInfoWithCircleID:(NSString *)circleID
  48                                  clique:(NSString *)clique
  49                                removals:(TPCounter)removals
  50                                   clock:(TPCounter)clock
  51                         trustSigningKey:(id<TPSigningKey>)trustSigningKey
  52                                   error:(NSError **)error
  53 {
  54     NSDictionary *dict = @{
  55                            kCircleID: circleID,
  56                            kClique: clique,
  57                            kRemovals: @(removals),
  58                            kClock: @(clock)
  59                            };
  60     NSData *data = [TPUtils serializedPListWithDictionary:dict];
  61     NSData *sig = [trustSigningKey signatureForData:data withError:error];
  62     if (nil == sig) {
  63         return nil;
  64     }
  65     TPPeerDynamicInfo* info = [self dynamicInfoWithPListData:data dynamicInfoSig:sig];
  66     assert(info);
  67     return info;
  68 }
  69
  70 + (instancetype)dynamicInfoWithPListData:(NSData *)dynamicInfoPList
  71                           dynamicInfoSig:(NSData *)dynamicInfoSig
  72 {
  73     id dict = [NSPropertyListSerialization propertyListWithData:dynamicInfoPList
  74                                                         options:NSPropertyListImmutable
  75                                                          format:nil
  76                                                           error:NULL];
  77     if (![dict isKindOfClass:[NSDictionary class]]) {
  78         return nil;
  79     }
  80
  81     TPPeerDynamicInfo* info = [[TPPeerDynamicInfo alloc] init];
  82
  83     if (![dict[kCircleID] isKindOfClass:[NSString class]]) {
  84         return nil;
  85     }
  86     info.circleID = dict[kCircleID];
  87
  88     if (![dict[kClique] isKindOfClass:[NSString class]]) {
  89         return nil;
  90     }
  91     info.clique = dict[kClique];
  92
  93     if (![dict[kRemovals] isKindOfClass:[NSNumber class]]) {
  94         return nil;
  95     }
  96     info.removals = [dict[kRemovals] unsignedLongLongValue];
  97
  98     if (![dict[kClock] isKindOfClass:[NSNumber class]]) {
  99         return nil;
 100     }
 101     info.clock = [dict[kClock] unsignedLongLongValue];
 102
 103     info.dynamicInfoPList = [dynamicInfoPList copy];
 104     info.dynamicInfoSig = [dynamicInfoSig copy];
 105
 106     return info;
 107 }
 108
 109 - (BOOL)isEqualToPeerDynamicInfo:(TPPeerDynamicInfo *)other
 110 {
 111     if (other == self) {
 112         return YES;
 113     }
 114     return [self.dynamicInfoPList isEqualToData:other.dynamicInfoPList]
 115         && [self.dynamicInfoSig isEqualToData:other.dynamicInfoSig];
 116 }
 117
 118 #pragma mark - NSObject
 119
 120 - (BOOL)isEqual:(id)object
 121 {
 122     if (self == object) {
 123         return YES;
 124     }
 125     if (![object isKindOfClass:[TPPeerDynamicInfo class]]) {
 126         return NO;
 127     }
 128     return [self isEqualToPeerDynamicInfo:object];
 129 }
 130
 131 @end