mirror of https://git.matrix.org/git/olm.git
126 lines
4.2 KiB
Objective-C
126 lines
4.2 KiB
Objective-C
/*
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Copyright 2019 New Vector 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 "OLMPkSigning.h"
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#include "olm/olm.h"
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#include "olm/pk.h"
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#include "OLMUtility.h"
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@interface OLMPkSigning ()
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{
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OlmPkSigning *sign;
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}
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@end
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@implementation OLMPkSigning
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- (void)dealloc {
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olm_clear_pk_signing(sign);
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free(sign);
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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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sign = (OlmPkSigning *)malloc(olm_pk_signing_size());
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olm_pk_signing(sign);
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}
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return self;
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}
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- (NSString *)doInitWithSeed:(NSData *)seed error:(NSError *__autoreleasing _Nullable *)error {
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size_t publicKeyLength = olm_pk_signing_public_key_length();
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NSMutableData *publicKeyData = [NSMutableData dataWithLength:publicKeyLength];
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if (!publicKeyData) {
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return nil;
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}
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NSMutableData *mutableSeed = [NSMutableData dataWithData:seed];
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size_t result = olm_pk_signing_key_from_seed(sign,
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publicKeyData.mutableBytes, publicKeyLength,
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mutableSeed.mutableBytes, mutableSeed.length);
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if (result == olm_error()) {
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const char *olm_error = olm_pk_signing_last_error(sign);
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NSString *errorString = [NSString stringWithUTF8String:olm_error];
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NSLog(@"[OLMPkSigning] doInitWithSeed: olm_pk_signing_key_from_seed error: %@", errorString);
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if (error && olm_error && errorString) {
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*error = [NSError errorWithDomain:OLMErrorDomain
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code:0
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userInfo:@{
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NSLocalizedDescriptionKey: errorString,
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NSLocalizedFailureReasonErrorKey: [NSString stringWithFormat:@"olm_pk_signing_key_from_seed error: %@", errorString]
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}];
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}
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return nil;
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}
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[mutableSeed resetBytesInRange:NSMakeRange(0, mutableSeed.length)];
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NSString *publicKey = [[NSString alloc] initWithData:publicKeyData encoding:NSUTF8StringEncoding];
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return publicKey;
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}
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- (NSString *)sign:(NSString *)message error:(NSError *__autoreleasing _Nullable *)error {
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NSData *messageData = [message dataUsingEncoding:NSUTF8StringEncoding];
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size_t signatureLength = olm_pk_signature_length();
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NSMutableData *signatureData = [NSMutableData dataWithLength:signatureLength];
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if (!signatureData) {
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return nil;
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}
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size_t result = olm_pk_sign(sign,
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messageData.bytes, messageData.length,
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signatureData.mutableBytes, signatureLength);
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if (result == olm_error()) {
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const char *olm_error = olm_pk_signing_last_error(sign);
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NSString *errorString = [NSString stringWithUTF8String:olm_error];
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NSLog(@"[OLMPkSigning] sign: olm_pk_sign error: %@", errorString);
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if (error && olm_error && errorString) {
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*error = [NSError errorWithDomain:OLMErrorDomain
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code:0
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userInfo:@{
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NSLocalizedDescriptionKey: errorString,
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NSLocalizedFailureReasonErrorKey: [NSString stringWithFormat:@"olm_pk_sign error: %@", errorString]
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}];
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}
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return nil;
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}
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NSString *signature = [[NSString alloc] initWithData:signatureData encoding:NSUTF8StringEncoding];
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return signature;
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}
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+ (NSData *)generateSeed {
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size_t seedLength = olm_pk_signing_seed_length();
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NSMutableData *seed = [OLMUtility randomBytesOfLength:seedLength];
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if (!seed) {
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return nil;
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}
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return seed;
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}
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@end
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