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/*
Copyright (C) 2019-Present SKALE Labs
This file is part of sgxwallet.
sgxwallet is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
sgxwallet is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with sgxwallet. If not, see <https://www.gnu.org/licenses/>.
@file AESUtils.c
@author Stan Kladko
@date 2020
*/
#include "sgx_trts.h"
#include "sgx_tcrypto.h"
#include "stdlib.h"
#include <string.h>
#include "AESUtils.h"
int AES_encrypt(char *message, uint8_t *encr_message, uint64_t encrLen) {
if (!message) {
LOG_ERROR("Null message in AES_encrypt");
return -1;
}
if (!encr_message) {
LOG_ERROR("Null encr message in AES_encrypt");
return -2;
}
auto len = strlen(message);
if (len + SGX_AESGCM_MAC_SIZE + SGX_AESGCM_IV_SIZE > encrLen ) {
LOG_ERROR("Output buffer too small");
return -3;
}
sgx_read_rand(encr_message + SGX_AESGCM_MAC_SIZE, SGX_AESGCM_IV_SIZE);
auto msgLen = strlen(message);
sgx_status_t status = sgx_rijndael128GCM_encrypt(&AES_key, (uint8_t*)message, strlen(message),
encr_message + SGX_AESGCM_MAC_SIZE + SGX_AESGCM_IV_SIZE,
encr_message + SGX_AESGCM_MAC_SIZE, SGX_AESGCM_IV_SIZE,
NULL, 0,
(sgx_aes_gcm_128bit_tag_t *) encr_message);
return status;
}
int AES_decrypt(uint8_t *encr_message, uint64_t length, char *message, uint64_t msgLen) {
if (!message) {
LOG_ERROR("Null message in AES_encrypt");
return -1;
}
if (!encr_message) {
LOG_ERROR("Null encr message in AES_encrypt");
return -2;
}
if (length < SGX_AESGCM_MAC_SIZE + SGX_AESGCM_IV_SIZE) {
LOG_ERROR("length < SGX_AESGCM_MAC_SIZE - SGX_AESGCM_IV_SIZE");
return -1;
}
uint64_t len = length - SGX_AESGCM_MAC_SIZE - SGX_AESGCM_IV_SIZE;
if (msgLen < len) {
LOG_ERROR("Output buffer not large enough");
return -2;
}
sgx_status_t status = sgx_rijndael128GCM_decrypt(&AES_key,
encr_message + SGX_AESGCM_MAC_SIZE + SGX_AESGCM_IV_SIZE, len,
message,
encr_message + SGX_AESGCM_MAC_SIZE, SGX_AESGCM_IV_SIZE,
NULL, 0,
(sgx_aes_gcm_128bit_tag_t *)encr_message);
return status;
}