mirror of https://github.com/oxen-io/session-ios
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
65 lines
1.5 KiB
Objective-C
65 lines
1.5 KiB
Objective-C
//
|
|
// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
|
|
//
|
|
|
|
#import "RootKey.h"
|
|
#import "ChainKey.h"
|
|
#import "RKCK.h"
|
|
#import "TSDerivedSecrets.h"
|
|
#import <Curve25519Kit/Curve25519.h>
|
|
#import <SessionProtocolKit/OWSAsserts.h>
|
|
|
|
static NSString* const kCoderData = @"kCoderData";
|
|
|
|
@implementation RootKey
|
|
|
|
+(BOOL)supportsSecureCoding{
|
|
return YES;
|
|
}
|
|
|
|
- (void)encodeWithCoder:(NSCoder *)aCoder{
|
|
[aCoder encodeObject:_keyData forKey:kCoderData];
|
|
}
|
|
|
|
- (id)initWithCoder:(NSCoder *)aDecoder{
|
|
self = [super init];
|
|
|
|
if (self) {
|
|
_keyData = [aDecoder decodeObjectOfClass:[NSData class] forKey:kCoderData];
|
|
}
|
|
|
|
return self;
|
|
}
|
|
|
|
- (instancetype)initWithData:(NSData *)data{
|
|
self = [super init];
|
|
|
|
OWSAssert(data.length == 32);
|
|
|
|
if (self) {
|
|
_keyData = data;
|
|
}
|
|
|
|
return self;
|
|
}
|
|
|
|
- (RKCK *)throws_createChainWithTheirEphemeral:(NSData *)theirEphemeral ourEphemeral:(ECKeyPair *)ourEphemeral
|
|
{
|
|
OWSAssert(theirEphemeral);
|
|
OWSAssert(ourEphemeral);
|
|
|
|
NSData *sharedSecret = [Curve25519 generateSharedSecretFromPublicKey:theirEphemeral andKeyPair:ourEphemeral];
|
|
OWSAssert(sharedSecret.length == 32);
|
|
|
|
TSDerivedSecrets *secrets =
|
|
[TSDerivedSecrets throws_derivedRatchetedSecretsWithSharedSecret:sharedSecret rootKey:_keyData];
|
|
OWSAssert(secrets);
|
|
|
|
RKCK *newRKCK = [[RKCK alloc] initWithRK:[[RootKey alloc] initWithData:secrets.cipherKey]
|
|
CK:[[ChainKey alloc] initWithData:secrets.macKey index:0]];
|
|
|
|
return newRKCK;
|
|
}
|
|
|
|
@end
|