void CCAESCmac(const void *key,
const uint8_t *data,
size_t dataLength, /* length of data in bytes */
void *macOut) /* MAC written here */
{
uint8_t X[16],Y[16], M_last[16], padded[16];
uint8_t K1[16], K2[16];
int flag;
size_t n;
const struct ccmode_ecb *aesmode = getCipherMode(kCCAlgorithmAES128, kCCModeECB, kCCEncrypt).ecb;
ccecb_ctx_decl(aesmode->size, ctx);
CC_DEBUG_LOG(ASL_LEVEL_ERR, "Entering\n");
// CMacInit
aesmode->init(aesmode, ctx, 16, key);
aesmode->ecb(ctx, 1, Y, X);
ccGenAESSubKey(aesmode, ctx, K1, K2);
// CMacUpdates (all in this case)
n = (dataLength+15) / 16; /* n is number of rounds */
if ( 0 == n ) {
n = 1;
flag = 0;
} else {
if ( (dataLength%16) == 0 ) flag = 1;
else flag = 0;
}
if ( flag ) { /* last block is complete block */
xor_128(&data[16*(n-1)],K1,M_last);
} else {
ccAESCMacPadding(&data[16*(n-1)],padded,dataLength%16);
xor_128(padded,K2,M_last);
}
memset(X, 0, 16);
for (size_t i=0; i<n-1; i++ ) {
xor_128(X,&data[16*i],Y); /* Y := Mi (+) X */
aesmode->ecb(ctx, 1, Y, X);
}
// CMacFinal
xor_128(X,M_last,Y);
aesmode->ecb(ctx, 1, Y, X);
memcpy(macOut, X, 16);
}
configuration_t *clparser(int argc, char ** argv) {
configuration_t *conf;
char *aOpt[] = {"aes128", "aes192", "aes256", "des"};
char *mOpt[] = {"ecb", "cfb", "ofb", "cbc"};
char *stegOpt[] = {"LSB1", "LSB4", "LSBE", "WANTED"};
if((conf = calloc(sizeof(configuration_t),1)) == NULL){
return NULL;
}
parserADT parser = newParser(argc, argv);
setArg(parser, arg_in, "-in", 0, 1, ARG_TYPE1, 0, NULL);
setArg(parser, arg_out, "-out", 0, 1, ARG_TYPE1, 0, NULL);
setArg(parser, arg_porter, "-p", 0, 1, ARG_TYPE1, 0, NULL);
setArg(parser, arg_embed, "-embed", 1, 1, ARG_TYPE0, 0, NULL);
setArg(parser, arg_extract, "-extract", 1, 1, ARG_TYPE0, 0, NULL);
setArg(parser, arg_pass, "-pass", 1, 1, ARG_TYPE1, 0, NULL);
setArg(parser, arg_algorithm, "-a", 1, 1, ARG_TYPE1, SIZE_OF_ARRAY(aOpt), aOpt);
setArg(parser, arg_ciphermode, "-m", 1, 1, ARG_TYPE1, SIZE_OF_ARRAY(mOpt) , mOpt);
setArg(parser, arg_steg, "-steg", 1, 1, ARG_TYPE1, SIZE_OF_ARRAY(stegOpt), stegOpt);
setArg(parser, arg_help, "-h", 1, 1, ARG_TYPE0, 0, NULL); //help
int error = 0;
while(!noMoreArgs(parser) && !error){
switch(getArg(parser)){
case arg_out:
error = !processArg(&conf->targetFile, getValue(parser), "target file");
break;
case arg_in:
error = !processArg(&conf->sourceFile, getValue(parser), "source file");
break;
case arg_porter:
error = !processArg(&conf->carrierFile, getValue(parser), "carrier file");
break;
case arg_embed:
if(conf->embed == steg_notSet){
LOG("embed/extract is embed\n");
conf->embed = steg_embed;
if(conf->encriptation != NULL) {
conf->encriptation->encrypOrDecrypt = encrypOrDecrypt_encrypt;
}
}
else {
printf("embed/extract already set\n");
error = 1;
}
break;
case arg_extract:
if(conf->embed == steg_notSet){
LOG("embed/extract is extract\n");
conf->embed = steg_extract;
if(conf->encriptation != NULL) {
conf->encriptation->encrypOrDecrypt = encrypOrDecrypt_decrypt;
}
} else {
printf("embed/extract already set\n");
error = 1;
}
break;
case arg_pass:
if(!initEncrypt(conf)){
error = 1;
} else {
error = !processArg((char**)&conf->encriptation->passKeyIv.password, getValue(parser), "password");
}
break;
case arg_algorithm:
if(!initEncrypt(conf)){
error = 1;
} else {
algorithm_t alg = getCryptoAlgorithm(getValue(parser));
if(alg != algorithm_none){
setCryptoAlgorithm(conf->encriptation, alg);
} else {
printf("encryptation algorithm not reconized: %s\n", getValue(parser));
error = 1;
}
}
break;
case arg_ciphermode:
if(!initEncrypt(conf)){
error = 1;
} else {
ciphermode_t cipherm = getCipherMode(getValue(parser));
if(cipherm != ciphermode_none){
setCryptoCiphermode(conf->encriptation, cipherm);
} else {
printf("ciphermode not reconized: %s\n", getValue(parser));
error = 1;
}
}
break;
case arg_steg:
if(conf->stegMode != stegMode_none){
printf("steg already set\n");
error = 1;
} else {
stegMode_t mode = getStegMode(getValue(parser));
if(mode == stegMode_none){
printf("steg mode not reconized: %s\n", getValue(parser));
error = 1;
} else {
conf->stegMode = mode;
}
}
break;
case arg_help:
showHelp();
return NULL;
break;
default:
error = 1;
break;
}
}
return conf;
}