inline void Mode_BASE::Process(byte* out, const byte* in, word32 sz)
{
if (mode_ == ECB)
ECB_Process(out, in, sz);
else if (mode_ == CBC)
if (dir_ == ENCRYPTION)
CBC_Encrypt(out, in, sz);
else
CBC_Decrypt(out, in, sz);
}
C4Err CBC_DecryptPAD(Cipher_Algorithm algorithm,
uint8_t *key, size_t key_len,
const uint8_t *iv,
const uint8_t *in, size_t in_len,
uint8_t **outData, size_t *outSize)
{
C4Err err = kC4Err_NoErr;
CBC_ContextRef cbc = kInvalidCBC_ContextRef;
uint8_t *buffer = NULL;
size_t buffLen = in_len;
uint8_t bytes2Pad = 0;
/* check Key length and algorithm */
switch(algorithm)
{
case kCipher_Algorithm_AES128:
ValidateParam (key_len == 16); break;
case kCipher_Algorithm_AES192:
ValidateParam (key_len == 24); break;
case kCipher_Algorithm_AES256:
ValidateParam (key_len == 32); break;
case kCipher_Algorithm_2FISH256:
ValidateParam (key_len == 32); break;
default:
RETERR(kC4Err_BadParams);
}
buffer = XMALLOC(buffLen);
err = CBC_Init(algorithm, key, iv, &cbc);CKERR;
err = CBC_Decrypt(cbc, in, buffLen, buffer); CKERR;
bytes2Pad = *(buffer+buffLen-1);
if(bytes2Pad > buffLen)
RETERR(kC4Err_CorruptData);
*outData = buffer;
*outSize = buffLen- bytes2Pad;
done:
if(IsC4Err(err))
{
if(buffer)
{
memset(buffer, buffLen, 0);
XFREE(buffer);
}
}
CBC_Free(cbc);
return err;
}
