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78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/*
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* Copyright 2006 Kai Blin
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*
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* This file implements RFC 2104 (HMAC) for the MD5 provider.
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* It is needed for NTLMv2 signing and sealing.
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*/
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#include "hmac_md5.h"
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void HMACMD5Init(HMAC_MD5_CTX *ctx, const unsigned char *key, unsigned int key_len)
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{
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int i;
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unsigned char inner_padding[64];
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unsigned char temp_key[16];
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if(key_len > 64)
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{
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MD5_CTX temp_ctx;
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MD5Init(&temp_ctx);
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MD5Update(&temp_ctx, key, key_len);
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MD5Final(&temp_ctx);
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memcpy(temp_key, temp_ctx.digest, 16);
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key = temp_key;
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key_len = 16;
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}
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memset(inner_padding, 0, 64);
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memset(ctx->outer_padding, 0, 64);
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memcpy(inner_padding, key, key_len);
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memcpy(ctx->outer_padding, key, key_len);
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for(i = 0; i < 64; ++i)
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{
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inner_padding[i] ^= 0x36;
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ctx->outer_padding[i] ^= 0x5c;
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}
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MD5Init(&(ctx->ctx));
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MD5Update(&(ctx->ctx), inner_padding, 64);
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}
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void HMACMD5Update(HMAC_MD5_CTX *ctx, const unsigned char *data, unsigned int data_len)
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{
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MD5Update(&(ctx->ctx), data, data_len);
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}
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void HMACMD5Final(HMAC_MD5_CTX *ctx, unsigned char *digest)
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{
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MD5_CTX outer_ctx;
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unsigned char inner_digest[16];
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MD5Final(&(ctx->ctx));
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memcpy(inner_digest, ctx->ctx.digest, 16);
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MD5Init(&outer_ctx);
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MD5Update(&outer_ctx, ctx->outer_padding, 64);
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MD5Update(&outer_ctx, inner_digest, 16);
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MD5Final(&outer_ctx);
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memcpy(digest, outer_ctx.digest, 16);
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}
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