mirror of https://git.matrix.org/git/olm.git
112 lines
3.9 KiB
Objective-C
112 lines
3.9 KiB
Objective-C
/*
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Copyright 2018 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 "OLMPkEncryption.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 OLMPkEncryption ()
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{
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OlmPkEncryption *session;
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}
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@end
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@implementation OLMPkEncryption
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- (void)dealloc {
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olm_clear_pk_encryption(session);
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free(session);
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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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session = (OlmPkEncryption *)malloc(olm_pk_encryption_size());
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olm_pk_encryption(session);
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}
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return self;
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}
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- (void)setRecipientKey:(NSString*)recipientKey {
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NSData *recipientKeyData = [recipientKey dataUsingEncoding:NSUTF8StringEncoding];
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olm_pk_encryption_set_recipient_key(session, recipientKeyData.bytes, recipientKeyData.length);
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}
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- (OLMPkMessage *)encryptMessage:(NSString *)message error:(NSError *__autoreleasing _Nullable *)error {
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NSData *plaintextData = [message dataUsingEncoding:NSUTF8StringEncoding];
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size_t randomLength = olm_pk_encrypt_random_length(session);
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NSMutableData *random = [OLMUtility randomBytesOfLength:randomLength];
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if (!random) {
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return nil;
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}
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size_t ciphertextLength = olm_pk_ciphertext_length(session, plaintextData.length);
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NSMutableData *ciphertext = [NSMutableData dataWithLength:ciphertextLength];
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if (!ciphertext) {
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return nil;
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}
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size_t macLength = olm_pk_mac_length(session);
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NSMutableData *macData = [NSMutableData dataWithLength:macLength];
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if (!macData) {
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return nil;
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}
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size_t ephemeralKeyLength = olm_pk_key_length();
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NSMutableData *ephemeralKeyData = [NSMutableData dataWithLength:ephemeralKeyLength];
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if (!ephemeralKeyData) {
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return nil;
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}
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size_t result = olm_pk_encrypt(session,
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plaintextData.bytes, plaintextData.length,
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ciphertext.mutableBytes, ciphertext.length,
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macData.mutableBytes, macLength,
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ephemeralKeyData.mutableBytes, ephemeralKeyLength,
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random.mutableBytes, randomLength);
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if (result == olm_error()) {
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const char *olm_error = olm_pk_encryption_last_error(session);
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NSString *errorString = [NSString stringWithUTF8String:olm_error];
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NSLog(@"[OLMPkEncryption] encryptMessage: olm_group_encrypt 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_group_encrypt error: %@", errorString]
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}];
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}
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return nil;
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}
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OLMPkMessage *encryptedMessage = [[OLMPkMessage alloc]
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initWithCiphertext:[[NSString alloc] initWithData:ciphertext encoding:NSUTF8StringEncoding]
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mac:[[NSString alloc] initWithData:macData encoding:NSUTF8StringEncoding]
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ephemeralKey:[[NSString alloc] initWithData:ephemeralKeyData encoding:NSUTF8StringEncoding]];
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return encryptedMessage;
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}
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@end
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