/*
* Copyright (C) 2011-2016 Intel Corporation. All rights reserved.
*
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* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
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* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*/
#include "sgx_tcrypto.h"
#include "ippcp.h"
#include "stdlib.h"
#include "string.h"
/* Rijndael AES-GCM
* Parameters:
* Return: sgx_status_t - SGX_SUCCESS or failure as defined sgx_error.h
* Inputs: sgx_aes_gcm_128bit_key_t *p_key - Pointer to key used in encryption/decryption operation
* uint8_t *p_src - Pointer to input stream to be encrypted/decrypted
* uint32_t src_len - Length of input stream to be encrypted/decrypted
* uint8_t *p_iv - Pointer to initialization vector to use
* uint32_t iv_len - Length of initialization vector
* uint8_t *p_aad - Pointer to input stream of additional authentication data
* uint32_t aad_len - Length of additional authentication data stream
* sgx_aes_gcm_128bit_tag_t *p_in_mac - Pointer to expected MAC in decryption process
* Output: uint8_t *p_dst - Pointer to cipher text. Size of buffer should be >= src_len.
* sgx_aes_gcm_128bit_tag_t *p_out_mac - Pointer to MAC generated from encryption process
* NOTE: Wrapper is responsible for confirming decryption tag matches encryption tag */
sgx_status_t sgx_rijndael128GCM_encrypt(const sgx_aes_gcm_128bit_key_t *p_key, const uint8_t *p_src, uint32_t src_len,
uint8_t *p_dst, const uint8_t *p_iv, uint32_t iv_len, const uint8_t *p_aad, uint32_t aad_len,
sgx_aes_gcm_128bit_tag_t *p_out_mac)
{
IppStatus error_code = ippStsNoErr;
IppsAES_GCMState* pState = NULL;
int ippStateSize = 0;
if ((p_key == NULL) || ((src_len > 0) && (p_dst == NULL)) || ((src_len > 0) && (p_src == NULL))
|| (p_out_mac == NULL) || (iv_len != SGX_AESGCM_IV_SIZE) || ((aad_len > 0) && (p_aad == NULL))
|| (p_iv == NULL) || ((p_src == NULL) && (p_aad == NULL)))
{
return SGX_ERROR_INVALID_PARAMETER;
}
error_code = ippsAES_GCMGetSize(&ippStateSize);
if (error_code != ippStsNoErr)
{
return SGX_ERROR_UNEXPECTED;
}
pState = (IppsAES_GCMState*)malloc(ippStateSize);
if (pState == NULL)
{
return SGX_ERROR_OUT_OF_MEMORY;
}
error_code = ippsAES_GCMInit((const Ipp8u *)p_key, SGX_AESGCM_KEY_SIZE, pState, ippStateSize);
if (error_code != ippStsNoErr)
{
// Clear temp State before free.
memset_s(pState, ippStateSize, 0, ippStateSize);
free(pState);
switch (error_code)
{
case ippStsMemAllocErr: return SGX_ERROR_OUT_OF_MEMORY;
case ippStsNullPtrErr:
case ippStsLengthErr: return SGX_ERROR_INVALID_PARAMETER;
default: return SGX_ERROR_UNEXPECTED;
}
}
error_code = ippsAES_GCMStart(p_iv, SGX_AESGCM_IV_SIZE, p_aad, aad_len, pState);
if (error_code != ippStsNoErr)
{
// Clear temp State before free.
memset_s(pState, ippStateSize, 0, ippStateSize);
free(pState);
switch (error_code)
{
case ippStsNullPtrErr:
case ippStsLengthErr: return SGX_ERROR_INVALID_PARAMETER;
default: return SGX_ERROR_UNEXPECTED;
}
}
if (src_len > 0) {
error_code = ippsAES_GCMEncrypt(p_src, p_dst, src_len, pState);
if (error_code != ippStsNoErr)
{
// Clear temp State before free.
memset_s(pState, ippStateSize, 0, ippStateSize);
free(pState);
switch (error_code)
{
case ippStsNullPtrErr: return SGX_ERROR_INVALID_PARAMETER;
default: return SGX_ERROR_UNEXPECTED;
}
}
}
error_code = ippsAES_GCMGetTag((Ipp8u *)p_out_mac, SGX_AESGCM_MAC_SIZE, pState);
if (error_code != ippStsNoErr)
{
// Clear temp State before free.
memset_s(p_dst, src_len, 0, src_len);
memset_s(pState, ippStateSize, 0, ippStateSize);
free(pState);
switch (error_code)
{
case ippStsNullPtrErr:
case ippStsLengthErr: return SGX_ERROR_INVALID_PARAMETER;
default: return SGX_ERROR_UNEXPECTED;
}
}
// Clear temp State before free.
memset_s(pState, ippStateSize, 0, ippStateSize);
free(pState);
return SGX_SUCCESS;
}
sgx_status_t sgx_rijndael128GCM_decrypt(const sgx_aes_gcm_128bit_key_t *p_key, const uint8_t *p_src,
uint32_t src_len, uint8_t *p_dst, const uint8_t *p_iv, uint32_t iv_len,
const uint8_t *p_aad, uint32_t aad_len, const sgx_aes_gcm_128bit_tag_t *p_in_mac)
{
IppStatus error_code = ippStsNoErr;
uint8_t l_tag[SGX_AESGCM_MAC_SIZE];
IppsAES_GCMState* pState = NULL;
int ippStateSize = 0;
if ((p_key == NULL) || ((src_len > 0) && (p_dst == NULL)) || ((src_len > 0) && (p_src == NULL))
|| (p_in_mac == NULL) || (iv_len != SGX_AESGCM_IV_SIZE) || ((aad_len > 0) && (p_aad == NULL))
|| (p_iv == NULL) || ((p_src == NULL) && (p_aad == NULL)))
{
return SGX_ERROR_INVALID_PARAMETER;
}
// Autenthication Tag returned by Decrypt to be compared with Tag created during seal
memset(&l_tag, 0, SGX_AESGCM_MAC_SIZE);
error_code = ippsAES_GCMGetSize(&ippStateSize);
if (error_code != ippStsNoErr)
{
return SGX_ERROR_UNEXPECTED;
}
pState = (IppsAES_GCMState*)malloc(ippStateSize);
if (pState == NULL)
{
return SGX_ERROR_OUT_OF_MEMORY;
}
error_code = ippsAES_GCMInit((const Ipp8u *)p_key, SGX_AESGCM_KEY_SIZE, pState, ippStateSize);
if (error_code != ippStsNoErr)
{
// Clear temp State before free.
memset_s(pState, ippStateSize, 0, ippStateSize);
free(pState);
switch (error_code)
{
case ippStsMemAllocErr: return SGX_ERROR_OUT_OF_MEMORY;
case ippStsNullPtrErr:
case ippStsLengthErr: return SGX_ERROR_INVALID_PARAMETER;
default: return SGX_ERROR_UNEXPECTED;
}
}
error_code = ippsAES_GCMStart(p_iv, SGX_AESGCM_IV_SIZE, p_aad, aad_len, pState);
if (error_code != ippStsNoErr)
{
// Clear temp State before free.
memset_s(pState, ippStateSize, 0, ippStateSize);
free(pState);
switch (error_code)
{
case ippStsNullPtrErr:
case ippStsLengthErr: return SGX_ERROR_INVALID_PARAMETER;
default: return SGX_ERROR_UNEXPECTED;
}
}
if (src_len > 0) {
error_code = ippsAES_GCMDecrypt(p_src, p_dst, src_len, pState);
if (error_code != ippStsNoErr)
{
// Clear temp State before free.
memset_s(pState, ippStateSize, 0, ippStateSize);
free(pState);
switch (error_code)
{
case ippStsNullPtrErr: return SGX_ERROR_INVALID_PARAMETER;
default: return SGX_ERROR_UNEXPECTED;
}
}
}
error_code = ippsAES_GCMGetTag((Ipp8u *)l_tag, SGX_AESGCM_MAC_SIZE, pState);
if (error_code != ippStsNoErr)
{
// Clear temp State before free.
memset_s(p_dst, src_len, 0, src_len);
memset_s(pState, ippStateSize, 0, ippStateSize);
free(pState);
switch (error_code)
{
case ippStsNullPtrErr:
case ippStsLengthErr: return SGX_ERROR_INVALID_PARAMETER;
default: return SGX_ERROR_UNEXPECTED;
}
}
// Clear temp State before free.
memset_s(pState, ippStateSize, 0, ippStateSize);
free(pState);
// Verify current data tag = data tag generated when sealing the data blob
if (consttime_memequal(p_in_mac, &l_tag, SGX_AESGCM_MAC_SIZE) == 0)
{
memset_s(p_dst, src_len, 0, src_len);
memset_s(&l_tag, SGX_AESGCM_MAC_SIZE, 0, SGX_AESGCM_MAC_SIZE);
return SGX_ERROR_MAC_MISMATCH;
}
memset_s(&l_tag, SGX_AESGCM_MAC_SIZE, 0, SGX_AESGCM_MAC_SIZE);
return SGX_SUCCESS;
}