70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
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/*
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* Copyright (c) 2007, Cameron Rich
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*
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* 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 are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of the axTLS project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* 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 OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* HMAC implementation - This code was originally taken from RFC2104
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*/
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#include <string.h>
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#include "crypt_md5.h"
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#include "crypt_hmac.h"
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/**
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* Perform HMAC-MD5
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*/
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void hmac_md5(const uint8_t *msg, int length, const uint8_t *key,
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int key_len, uint8_t *digest)
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{
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OVMS_MD5_CTX context;
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int i;
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uint8_t k_ipad[64];
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uint8_t k_opad[64];
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memset(k_ipad, 0, sizeof k_ipad);
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memset(k_opad, 0, sizeof k_opad);
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memcpy(k_ipad, key, key_len);
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memcpy(k_opad, key, key_len);
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for (i = 0; i < 64; i++)
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{
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k_ipad[i] ^= 0x36;
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k_opad[i] ^= 0x5c;
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}
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OVMS_MD5_Init(&context);
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OVMS_MD5_Update(&context, k_ipad, 64);
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OVMS_MD5_Update(&context, msg, length);
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OVMS_MD5_Final(digest,&context);
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OVMS_MD5_Init(&context);
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OVMS_MD5_Update(&context, k_opad, 64);
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OVMS_MD5_Update(&context, digest, 16);
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OVMS_MD5_Final(digest,&context);
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}
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