103 lines
3.5 KiB
Objective-C
103 lines
3.5 KiB
Objective-C
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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#import "OWSPrimaryStorage+PreKeyStore.h"
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#import "OWSPrimaryStorage+keyFromIntLong.h"
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#import "TSStorageKeys.h"
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#import "YapDatabaseConnection+OWS.h"
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#import <AxolotlKit/AxolotlExceptions.h>
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#import <AxolotlKit/SessionBuilder.h>
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#import <SignalCoreKit/Cryptography.h>
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#define OWSPrimaryStoragePreKeyStoreCollection @"TSStorageManagerPreKeyStoreCollection"
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#define TSNextPrekeyIdKey @"TSStorageInternalSettingsNextPreKeyId"
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#define BATCH_SIZE 100
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@implementation OWSPrimaryStorage (PreKeyStore)
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- (NSArray<PreKeyRecord *> *)generatePreKeyRecords;
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{
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NSMutableArray *preKeyRecords = [NSMutableArray array];
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@synchronized(self)
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{
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int preKeyId = [self nextPreKeyId];
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OWSLogInfo(@"building %d new preKeys starting from preKeyId: %d", BATCH_SIZE, preKeyId);
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for (int i = 0; i < BATCH_SIZE; i++) {
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ECKeyPair *keyPair = [Curve25519 generateKeyPair];
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PreKeyRecord *record = [[PreKeyRecord alloc] initWithId:preKeyId keyPair:keyPair];
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[preKeyRecords addObject:record];
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preKeyId++;
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}
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[self.dbReadWriteConnection setInt:preKeyId
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forKey:TSNextPrekeyIdKey
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inCollection:TSStorageInternalSettingsCollection];
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}
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return preKeyRecords;
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}
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- (void)storePreKeyRecords:(NSArray<PreKeyRecord *> *)preKeyRecords
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{
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for (PreKeyRecord *record in preKeyRecords) {
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[self.dbReadWriteConnection setObject:record
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forKey:[self keyFromInt:record.Id]
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inCollection:OWSPrimaryStoragePreKeyStoreCollection];
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}
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}
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- (PreKeyRecord *)loadPreKey:(int)preKeyId
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{
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PreKeyRecord *preKeyRecord = [self.dbReadConnection preKeyRecordForKey:[self keyFromInt:preKeyId]
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inCollection:OWSPrimaryStoragePreKeyStoreCollection];
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if (!preKeyRecord) {
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OWSRaiseException(InvalidKeyIdException, @"No pre key found matching key id");
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} else {
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return preKeyRecord;
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}
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}
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- (void)storePreKey:(int)preKeyId preKeyRecord:(PreKeyRecord *)record
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{
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[self.dbReadWriteConnection setObject:record
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forKey:[self keyFromInt:preKeyId]
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inCollection:OWSPrimaryStoragePreKeyStoreCollection];
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}
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- (BOOL)containsPreKey:(int)preKeyId
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{
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PreKeyRecord *preKeyRecord = [self.dbReadConnection preKeyRecordForKey:[self keyFromInt:preKeyId]
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inCollection:OWSPrimaryStoragePreKeyStoreCollection];
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return (preKeyRecord != nil);
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}
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- (void)removePreKey:(int)preKeyId
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{
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[self.dbReadWriteConnection removeObjectForKey:[self keyFromInt:preKeyId]
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inCollection:OWSPrimaryStoragePreKeyStoreCollection];
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}
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- (int)nextPreKeyId
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{
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int lastPreKeyId =
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[self.dbReadConnection intForKey:TSNextPrekeyIdKey inCollection:TSStorageInternalSettingsCollection];
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if (lastPreKeyId < 1) {
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// One-time prekey ids must be > 0 and < kPreKeyOfLastResortId.
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lastPreKeyId = 1 + arc4random_uniform(kPreKeyOfLastResortId - (BATCH_SIZE + 1));
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} else if (lastPreKeyId > kPreKeyOfLastResortId - BATCH_SIZE) {
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// We want to "overflow" to 1 when we reach the "prekey of last resort" id
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// to avoid biasing towards higher values.
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lastPreKeyId = 1;
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}
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OWSCAssertDebug(lastPreKeyId > 0 && lastPreKeyId < kPreKeyOfLastResortId);
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return lastPreKeyId;
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}
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@end
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