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// Copyright 2005-2012 The MumbleKit Developers. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
/*
* This code implements OCB-AES128.
* In the US, OCB is covered by patents. The inventor has given a license
* to all programs distributed under the GPL.
* Mumble is BSD (revised) licensed, meaning you can use the code in a
* closed-source program. If you do, you'll have to either replace
* OCB with something else or get yourself a license.
*/
#import "MKCryptState.h"
#include "CryptState.h"
using namespace MumbleClient;
@interface MKCryptState () {
CryptState *_cs;
}
@end
@implementation MKCryptState
- (id) init {
self = [super init];
if (self == nil)
return nil;
_cs = new CryptState;
return self;
}
- (void) dealloc {
delete _cs;
[super dealloc];
}
- (BOOL) valid {
return (BOOL)_cs->isValid();
}
- (void) generateKey {
_cs->genKey();
}
- (void) setKey:(NSData *)key eiv:(NSData *)enc div:(NSData *)dec {
NSAssert([key length] == AES_BLOCK_SIZE, @"key length not AES_BLOCK_SIZE");
NSAssert([enc length] == AES_BLOCK_SIZE, @"enc length not AES_BLOCK_SIZE");
NSAssert([dec length] == AES_BLOCK_SIZE, @"dec length not AES_BLOCK_SIZE");
_cs->setKey((const unsigned char *)[key bytes], (const unsigned char *)[enc bytes], (const unsigned char *)[dec bytes]);
}
- (void) setDecryptIV:(NSData *)dec {
NSAssert([dec length] == AES_BLOCK_SIZE, @"dec length not AES_BLOCK_SIZE");
_cs->setDecryptIV((const unsigned char *)[dec bytes]);
}
- (NSData *) encryptData:(NSData *)data {
if ([data length] > UINT_MAX) {
return nil;
}
NSMutableData *crypted = [[NSMutableData alloc] initWithLength:[data length]+4];
_cs->encrypt((const unsigned char *)[data bytes], (unsigned char *)[crypted mutableBytes], (unsigned int)[data length]);
return [crypted autorelease];
}
- (NSData *) decryptData:(NSData *)data {
if (!([data length] > 4))
return nil;
if ([data length] > UINT_MAX) {
return nil;
}
NSMutableData *plain = [[NSMutableData alloc] initWithLength:[data length]-4];
if (_cs->decrypt((const unsigned char *)[data bytes], (unsigned char *)[plain mutableBytes], (unsigned int)[data length])) {
return [plain autorelease];
} else {
[plain release];
return nil;
}
}
@end
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