static int aes_crypt_cfb128_wrap( void *ctx, mbedtls_operation_t operation,
size_t length, size_t *iv_off, unsigned char *iv,
const unsigned char *input, unsigned char *output )
{
return mbedtls_aes_crypt_cfb128( (mbedtls_aes_context *) ctx, operation, length, iv_off, iv,
input, output );
}
int blufi_aes_decrypt(uint8_t iv8, uint8_t *crypt_data, int crypt_len)
{
int ret;
size_t iv_offset = 0;
uint8_t iv0[16];
memcpy(iv0, blufi_sec->iv, sizeof(blufi_sec->iv));
iv0[0] = iv8; /* set iv8 as the iv0[0] */
ret = mbedtls_aes_crypt_cfb128(&blufi_sec->aes, MBEDTLS_AES_DECRYPT, crypt_len, &iv_offset, iv0, crypt_data, crypt_data);
if (ret) {
return -1;
}
return crypt_len;
}
int AESContext::cryptCFB128(State & state, mbedtls_aes_context * context){
Stack * stack = state.stack;
if (stack->is<LUA_TNUMBER>(1) && stack->is<LUA_TNUMBER>(2) && stack->is<LUA_TSTRING>(3) && stack->is<LUA_TSTRING>(4)){
std::string ivStr = stack->toLString(3);
std::string input = stack->toLString(4);
int length = input.length();
if (((length % 16) == 0) && (ivStr.length() == 16)){
int mode = stack->to<int>(1);
size_t ivOff = stack->to<int>(2);
unsigned char iv[16];
unsigned char * output = new unsigned char[length];
memcpy(iv, ivStr.c_str(), 16);
int result = mbedtls_aes_crypt_cfb128(context, mode, length, &ivOff, iv, reinterpret_cast<const unsigned char *>(input.c_str()), output);
if (result == 0){
stack->push<int>(ivOff);
stack->pushLString(std::string(reinterpret_cast<char*>(iv), 16));
stack->pushLString(std::string(reinterpret_cast<char*>(output), length));
delete[] output;
return 3;
}
else{
stack->push<int>(result);
delete[] output;
return 1;
}
}
else{
stack->push<bool>(false);
return 1;
}
}
return 0;
}
