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65 lines
1.5 KiB
Objective-C
65 lines
1.5 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 "RootKey.h"
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#import "ChainKey.h"
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#import "RKCK.h"
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#import "TSDerivedSecrets.h"
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#import <Curve25519Kit/Curve25519.h>
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#import <SignalCoreKit/OWSAsserts.h>
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static NSString* const kCoderData = @"kCoderData";
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@implementation RootKey
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+(BOOL)supportsSecureCoding{
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return YES;
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}
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- (void)encodeWithCoder:(NSCoder *)aCoder{
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[aCoder encodeObject:_keyData forKey:kCoderData];
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}
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- (id)initWithCoder:(NSCoder *)aDecoder{
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self = [super init];
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if (self) {
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_keyData = [aDecoder decodeObjectOfClass:[NSData class] forKey:kCoderData];
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}
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return self;
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}
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- (instancetype)initWithData:(NSData *)data{
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self = [super init];
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OWSAssert(data.length == 32);
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if (self) {
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_keyData = data;
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}
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return self;
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}
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- (RKCK *)throws_createChainWithTheirEphemeral:(NSData *)theirEphemeral ourEphemeral:(ECKeyPair *)ourEphemeral
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{
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OWSAssert(theirEphemeral);
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OWSAssert(ourEphemeral);
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NSData *sharedSecret = [Curve25519 throws_generateSharedSecretFromPublicKey:theirEphemeral andKeyPair:ourEphemeral];
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OWSAssert(sharedSecret.length == 32);
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TSDerivedSecrets *secrets =
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[TSDerivedSecrets throws_derivedRatchetedSecretsWithSharedSecret:sharedSecret rootKey:_keyData];
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OWSAssert(secrets);
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RKCK *newRKCK = [[RKCK alloc] initWithRK:[[RootKey alloc] initWithData:secrets.cipherKey]
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CK:[[ChainKey alloc] initWithData:secrets.macKey index:0]];
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return newRKCK;
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}
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@end
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