121 lines
3.3 KiB
Objective-C
121 lines
3.3 KiB
Objective-C
/*
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Copyright 2016 Chris Ballinger
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Copyright 2016 OpenMarket Ltd
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Copyright 2016 Vector Creations Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#import "OLMUtility.h"
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#include "olm/olm.h"
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NSString *const OLMErrorDomain = @"org.matrix.olm";
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@interface OLMUtility()
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@property (nonatomic) OlmUtility *utility;
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@end
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@implementation OLMUtility
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- (void) dealloc {
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olm_clear_utility(_utility);
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free(_utility);
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}
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- (BOOL) initializeUtilityMemory {
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size_t utilitySize = olm_utility_size();
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_utility = malloc(utilitySize);
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NSParameterAssert(_utility != nil);
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if (!_utility) {
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return NO;
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}
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_utility = olm_utility(_utility);
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NSParameterAssert(_utility != nil);
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if (!_utility) {
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return NO;
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}
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return YES;
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}
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- (instancetype) init {
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self = [super init];
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if (!self) {
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return nil;
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}
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BOOL success = [self initializeUtilityMemory];
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if (!success) {
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return nil;
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}
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return self;
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}
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- (NSString *)sha256:(NSData *)message {
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size_t length = olm_sha256_length(_utility);
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NSMutableData *shaData = [NSMutableData dataWithLength:length];
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if (!shaData) {
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return nil;
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}
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size_t result = olm_sha256(_utility, message.bytes, message.length, shaData.mutableBytes, shaData.length);
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if (result == olm_error()) {
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const char *error = olm_utility_last_error(_utility);
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NSLog(@"olm_sha256 error: %s", error);
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return nil;
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}
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NSString *sha = [[NSString alloc] initWithData:shaData encoding:NSUTF8StringEncoding];
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return sha;
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}
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- (BOOL)verifyEd25519Signature:(NSString*)signature key:(NSString*)key message:(NSData*)message error:(NSError**)error {
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NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];
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NSData *signatureData = [signature dataUsingEncoding:NSUTF8StringEncoding];
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size_t result = olm_ed25519_verify(_utility,
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keyData.bytes, keyData.length,
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message.bytes, message.length,
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(void*)signatureData.bytes, signatureData.length
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);
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if (result == olm_error()) {
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if (error) {
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NSDictionary *userInfo = @{NSLocalizedFailureReasonErrorKey: [NSString stringWithUTF8String:olm_utility_last_error(_utility)]};
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// @TODO
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*error = [[NSError alloc] initWithDomain:@"OLMKitErrorDomain" code:0 userInfo:userInfo];
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}
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return NO;
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}
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else {
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return YES;
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}
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}
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+ (NSMutableData*) randomBytesOfLength:(NSUInteger)length {
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NSMutableData *randomData = [NSMutableData dataWithLength:length];
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if (!randomData) {
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return nil;
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}
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int result = SecRandomCopyBytes(kSecRandomDefault, randomData.length, randomData.mutableBytes);
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if (result != 0) {
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return nil;
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}
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return randomData;
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}
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@end
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