mirror of
https://github.com/intel/linux-sgx
synced 2026-06-08 14:49:32 +00:00
Li, Xun
112 lines
4.1 KiB
C++
112 lines
4.1 KiB
C++
/*
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* Copyright (C) 2011-2018 Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "sgx_ecp_types.h"
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#include "ecp_interface.h"
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#include "stdlib.h"
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#include "string.h"
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#ifndef ERROR_BREAK
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#define ERROR_BREAK(x) if(x != ippStsNoErr){break;}
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#endif
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#ifndef NULL_BREAK
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#define NULL_BREAK(x) if(!x){break;}
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#endif
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#ifndef SAFE_FREE
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#define SAFE_FREE(ptr) {if (NULL != (ptr)) {free(ptr); (ptr)=NULL;}}
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#endif
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#define MAC_KEY_SIZE 16
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#define EC_DERIVATION_BUFFER_SIZE(label_length) ((label_length) +4)
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sgx_status_t derive_key(
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const sgx_ec256_dh_shared_t* shared_key,
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const char* label,
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uint32_t label_length,
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sgx_ec_key_128bit_t* derived_key)
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{
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sgx_status_t se_ret = SGX_SUCCESS;
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uint8_t cmac_key[MAC_KEY_SIZE];
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sgx_ec_key_128bit_t key_derive_key;
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if (!shared_key || !derived_key || !label)
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{
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return SGX_ERROR_INVALID_PARAMETER;
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}
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/*check integer overflow */
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if (label_length > EC_DERIVATION_BUFFER_SIZE(label_length))
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{
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return SGX_ERROR_INVALID_PARAMETER;
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}
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memset(cmac_key, 0, MAC_KEY_SIZE);
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se_ret = sgx_rijndael128_cmac_msg((sgx_cmac_128bit_key_t *)cmac_key,
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(uint8_t*)shared_key,
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sizeof(sgx_ec256_dh_shared_t),
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(sgx_cmac_128bit_tag_t *)&key_derive_key);
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if (SGX_SUCCESS != se_ret)
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{
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memset_s(&key_derive_key, sizeof(key_derive_key), 0, sizeof(key_derive_key));
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INTERNAL_SGX_ERROR_CODE_CONVERTOR(se_ret);
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return se_ret;
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}
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/* derivation_buffer = counter(0x01) || label || 0x00 || output_key_len(0x0080) */
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uint32_t derivation_buffer_length = EC_DERIVATION_BUFFER_SIZE(label_length);
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uint8_t *p_derivation_buffer = (uint8_t *)malloc(derivation_buffer_length);
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if (p_derivation_buffer == NULL)
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{
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return SGX_ERROR_OUT_OF_MEMORY;
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}
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memset(p_derivation_buffer, 0, derivation_buffer_length);
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/*counter = 0x01 */
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p_derivation_buffer[0] = 0x01;
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/*label*/
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memcpy(&p_derivation_buffer[1], label, label_length);
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/*output_key_len=0x0080*/
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uint16_t *key_len = (uint16_t *)&p_derivation_buffer[derivation_buffer_length - 2];
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*key_len = 0x0080;
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se_ret = sgx_rijndael128_cmac_msg((sgx_cmac_128bit_key_t *)&key_derive_key,
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p_derivation_buffer,
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derivation_buffer_length,
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(sgx_cmac_128bit_tag_t *)derived_key);
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memset_s(&key_derive_key, sizeof(key_derive_key), 0, sizeof(key_derive_key));
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free(p_derivation_buffer);
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if(SGX_SUCCESS != se_ret)
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{
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INTERNAL_SGX_ERROR_CODE_CONVERTOR(se_ret);
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}
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return se_ret;
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}
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