mirror of
https://github.com/intel/linux-sgx
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lzha101
82 lines
3.2 KiB
C++
82 lines
3.2 KiB
C++
/*
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* Copyright (C) 2011-2021 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_sha256_128.h"
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/*
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** SHA256-128 implementation:
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** out-length := number of bits to output
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** prefix := SHA-256(out-length)
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** digest := SHA-256(prefix || m)
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** output := truncate(digest, out-length), always return first out-length bits
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*/
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sgx_status_t SGXAPI sgx_sha256_128_msg(const uint8_t *p_src, uint32_t src_len, sgx_sha256_128_hash_t *p_hash)
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{
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uint32_t outlength = 128; /*number of bits to output */
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uint32_t sha256_128_digest_length;
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sgx_status_t ret;
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sgx_sha256_hash_t digest = {0};
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uint8_t* digest_buffer = NULL;
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/* check potential overflow and NULL pointer */
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if( (UINT32_MAX-src_len) < sizeof(sgx_sha256_hash_t) || !p_hash || !p_src)
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return SGX_ERROR_INVALID_PARAMETER;
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sha256_128_digest_length = (uint32_t)sizeof(sgx_sha256_hash_t)+ src_len;
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digest_buffer = (uint8_t*)malloc(sha256_128_digest_length);
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if(!digest_buffer)
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return SGX_ERROR_OUT_OF_MEMORY;
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memset(digest_buffer, 0, sha256_128_digest_length);
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/* get prefix := SHA-256(out-length) */
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ret = sgx_sha256_msg((const uint8_t*)&outlength, sizeof(uint32_t), (sgx_sha256_hash_t*)digest_buffer);
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if(SGX_SUCCESS != ret)
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goto clean_up;
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/* get digest := SHA-256(prefix || m) */
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memcpy(digest_buffer+sizeof(sgx_sha256_hash_t), p_src, src_len); /* copy m to digest_buffer */
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ret = sgx_sha256_msg((const uint8_t*)digest_buffer, sha256_128_digest_length, &digest);
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if(SGX_SUCCESS != ret)
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goto clean_up;
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/* output truncated hash
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return the first 128 bits */
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memcpy(p_hash, &digest, sizeof(sgx_sha256_128_hash_t));
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clean_up:
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if(digest_buffer)
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free(digest_buffer);
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return ret;
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}
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