94 lines
3.1 KiB
Objective-C
94 lines
3.1 KiB
Objective-C
//
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// SignalKeyingStorage.m
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// Signal
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//
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// Created by Frederic Jacobs on 09/07/14.
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// Copyright (c) 2014 Open Whisper Systems. All rights reserved.
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//
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#import "Constraints.h"
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#import "CryptoTools.h"
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#import "SignalKeyingStorage.h"
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#import "TSStorageManager.h"
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#import "Util.h"
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#define SignalKeyingCollection @"SignalKeyingCollection"
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#define SIGNALING_MAC_KEY_LENGTH 20
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#define SIGNALING_CIPHER_KEY_LENGTH 16
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#define SAVED_PASSWORD_LENGTH 18
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#define SIGNALING_EXTRA_KEY_LENGTH 4
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@implementation SignalKeyingStorage
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+ (void)generateServerAuthPassword {
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[self storeString:[[CryptoTools generateSecureRandomData:SAVED_PASSWORD_LENGTH] encodedAsBase64]
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forKey:SAVED_PASSWORD_KEY];
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}
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+ (void)generateSignaling {
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[self storeData:[CryptoTools generateSecureRandomData:SIGNALING_MAC_KEY_LENGTH] forKey:SIGNALING_MAC_KEY];
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[self storeData:[CryptoTools generateSecureRandomData:SIGNALING_CIPHER_KEY_LENGTH] forKey:SIGNALING_CIPHER_KEY];
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[self storeData:[CryptoTools generateSecureRandomData:SIGNALING_EXTRA_KEY_LENGTH] forKey:SIGNALING_EXTRA_KEY];
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}
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+ (int64_t)getAndIncrementOneTimeCounter {
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__block int64_t oldCounter;
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oldCounter = [[self stringForKey:PASSWORD_COUNTER_KEY] longLongValue];
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int64_t newCounter = (oldCounter == INT64_MAX) ? INT64_MIN : (oldCounter + 1);
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[self storeString:[@(newCounter) stringValue] forKey:PASSWORD_COUNTER_KEY];
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return newCounter;
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}
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+ (NSData *)signalingCipherKey {
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return [self dataForKey:SIGNALING_CIPHER_KEY andVerifyLength:SIGNALING_CIPHER_KEY_LENGTH];
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}
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+ (NSData *)signalingMacKey {
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return [self dataForKey:SIGNALING_MAC_KEY andVerifyLength:SIGNALING_MAC_KEY_LENGTH];
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}
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+ (NSData *)signalingExtraKey {
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return [self dataForKey:SIGNALING_EXTRA_KEY andVerifyLength:SIGNALING_EXTRA_KEY_LENGTH];
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}
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+ (NSString *)serverAuthPassword {
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NSString *password = [self stringForKey:SAVED_PASSWORD_KEY];
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NSData *data = [password decodedAsBase64Data];
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if (data.length != SAVED_PASSWORD_LENGTH) {
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DDLogError(@"The server password has incorrect length. Is %lu but should be %d",
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(unsigned long)data.length,
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SAVED_PASSWORD_LENGTH);
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}
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return password;
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}
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#pragma mark Keychain wrapper methods
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+ (void)storeData:(NSData *)data forKey:(NSString *)key {
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[TSStorageManager.sharedManager setObject:data forKey:key inCollection:SignalKeyingCollection];
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}
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+ (NSData *)dataForKey:(NSString *)key andVerifyLength:(uint)length {
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NSData *data = [self dataForKey:key];
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if (data.length != length) {
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DDLogError(@"Length of data not matching. Got %lu, expected %u", (unsigned long)data.length, length);
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}
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return data;
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}
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+ (NSData *)dataForKey:(NSString *)key {
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return [TSStorageManager.sharedManager dataForKey:key inCollection:SignalKeyingCollection];
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}
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+ (NSString *)stringForKey:(NSString *)key {
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return [TSStorageManager.sharedManager stringForKey:key inCollection:SignalKeyingCollection];
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}
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+ (void)storeString:(NSString *)string forKey:(NSString *)key {
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[TSStorageManager.sharedManager setObject:string forKey:key inCollection:SignalKeyingCollection];
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}
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@end
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