static void
ccRSACryptorClear(CCRSACryptorRef theKey)
{
CCRSACryptor *key = (CCRSACryptor *) theKey;
if(!key) return;
CC_XZEROMEM(key, sizeof(CCRSACryptor));
CC_XFREE(key, sizeof(CCRSACryptor));
}
struct ccrng_state *
ccDevRandomGetRngState(void)
{
cc_globals_t globals = _cc_globals();
dispatch_once(&globals->dev_random_init, ^{
globals->dev_random.rngtype = rng_devrandom;
globals->dev_random.state.devrandom.devrandom = (struct ccrng_system_state *)CC_XMALLOC(sizeof(struct ccrng_system_state));
globals->dev_random.status=ccrng_system_init(globals->dev_random.state.devrandom.devrandom);
if (globals->dev_random.status<0)
{
CC_XFREE(globals->dev_random.state.devrandom.devrandom,sizeof(struct ccrng_system_state));
globals->dev_random.state.devrandom.devrandom=NULL;
}
});
CCCryptorStatus
CCRSACryptorDecodePayloadPKCS1(
CCRSACryptorRef publicKey,
const void *cipherText,
size_t cipherTextLen,
void *plainText,
size_t *plainTextLen)
{
int tcReturn;
int stat = 0;
CCRSACryptor *publicCryptor = publicKey;
uint8_t *message;
unsigned long messageLen, modulusLen;
CCCryptorStatus retval = kCCSuccess;
modulusLen = CCRSAGetKeySize(publicKey);
messageLen = modulusLen / 8;
if((message = CC_XMALLOC(messageLen)) == NULL) return kCCMemoryFailure;
tcReturn = rsa_exptmod(cipherText, cipherTextLen, message, messageLen, publicCryptor->keyType, &publicCryptor->key);
if(tcReturn) {
retval = kCCDecodeError;
goto out;
}
tcReturn = pkcs_1_v1_5_decode(message, messageLen, LTC_PKCS_1_EME, modulusLen, plainText, plainTextLen, &stat);
if(tcReturn) {
retval = kCCDecodeError;
goto out;
}
if(!stat) {
retval = kCCDecodeError;
goto out;
}
out:
CC_XZEROMEM(message, messageLen);
CC_XFREE(message, messageLen);
return retval;
}
