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82 lines
2.9 KiB
Objective-C
82 lines
2.9 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 "SerializationUtilities.h"
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#import <CommonCrypto/CommonCrypto.h>
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#import <SignalCoreKit/OWSAsserts.h>
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NS_ASSUME_NONNULL_BEGIN
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@implementation SerializationUtilities
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+ (int)highBitsToIntFromByte:(Byte)byte
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{
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return (byte & 0xFF) >> 4;
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}
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+ (int)lowBitsToIntFromByte:(Byte)byte
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{
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return (byte & 0xF);
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}
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+ (Byte)intsToByteHigh:(int)highValue low:(int)lowValue
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{
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return (Byte)((highValue << 4 | lowValue) & 0xFF);
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}
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+ (NSData *)throws_macWithVersion:(int)version
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identityKey:(NSData *)senderIdentityKey
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receiverIdentityKey:(NSData *)receiverIdentityKey
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macKey:(NSData *)macKey
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serialized:(NSData *)serialized
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{
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if (!macKey) {
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@throw [NSException exceptionWithName:NSInvalidArgumentException reason:@"Missing macKey." userInfo:nil];
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}
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if (macKey.length >= SIZE_MAX) {
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@throw [NSException exceptionWithName:NSInvalidArgumentException reason:@"Oversize macKey." userInfo:nil];
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}
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if (!senderIdentityKey) {
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@throw
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[NSException exceptionWithName:NSInvalidArgumentException reason:@"Missing senderIdentityKey" userInfo:nil];
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}
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if (senderIdentityKey.length >= SIZE_MAX) {
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@throw [NSException exceptionWithName:NSInvalidArgumentException
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reason:@"Oversize senderIdentityKey"
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userInfo:nil];
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}
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if (!receiverIdentityKey) {
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@throw [NSException exceptionWithName:NSInvalidArgumentException
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reason:@"Missing receiverIdentityKey"
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userInfo:nil];
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}
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if (receiverIdentityKey.length >= SIZE_MAX) {
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@throw [NSException exceptionWithName:NSInvalidArgumentException
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reason:@"Oversize receiverIdentityKey"
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userInfo:nil];
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}
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if (!serialized) {
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@throw [NSException exceptionWithName:NSInvalidArgumentException reason:@"Missing serialized." userInfo:nil];
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}
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if (serialized.length >= SIZE_MAX) {
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@throw [NSException exceptionWithName:NSInvalidArgumentException reason:@"Oversize serialized." userInfo:nil];
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}
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NSMutableData *_Nullable bufferData = [NSMutableData dataWithLength:CC_SHA256_DIGEST_LENGTH];
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OWSAssert(bufferData);
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CCHmacContext context;
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CCHmacInit(&context, kCCHmacAlgSHA256, [macKey bytes], [macKey length]);
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CCHmacUpdate(&context, [senderIdentityKey bytes], [senderIdentityKey length]);
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CCHmacUpdate(&context, [receiverIdentityKey bytes], [receiverIdentityKey length]);
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CCHmacUpdate(&context, [serialized bytes], [serialized length]);
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CCHmacFinal(&context, bufferData.mutableBytes);
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return [bufferData subdataWithRange:NSMakeRange(0, MAC_LENGTH)];
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}
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@end
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NS_ASSUME_NONNULL_END
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