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41 results

ecc-mod.c

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  • md5.c 2.18 KiB
    /* md5.c
    
       The MD5 hash function, described in RFC 1321.
    
       Copyright (C) 2001 Niels Möller
    
       This file is part of GNU Nettle.
    
       GNU Nettle is free software: you can redistribute it and/or
       modify it under the terms of either:
    
         * the GNU Lesser General Public License as published by the Free
           Software Foundation; either version 3 of the License, or (at your
           option) any later version.
    
       or
    
         * the GNU General Public License as published by the Free
           Software Foundation; either version 2 of the License, or (at your
           option) any later version.
    
       or both in parallel, as here.
    
       GNU Nettle is distributed in the hope that it will be useful,
       but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       General Public License for more details.
    
       You should have received copies of the GNU General Public License and
       the GNU Lesser General Public License along with this program.  If
       not, see http://www.gnu.org/licenses/.
    */
    
    /* Based on public domain code hacked by Colin Plumb, Andrew Kuchling, and
     * Niels Möller. */
    
    #if HAVE_CONFIG_H
    # include "config.h"
    #endif
    
    #include <assert.h>
    #include <string.h>
    
    #include "md5.h"
    
    #include "macros.h"
    #include "nettle-write.h"
    
    void
    md5_init(struct md5_ctx *ctx)
    {
      const uint32_t iv[_MD5_DIGEST_LENGTH] =
        {
          0x67452301,
          0xefcdab89,
          0x98badcfe,
          0x10325476,
        };
      memcpy(ctx->state, iv, sizeof(ctx->state));
      ctx->count = 0;
      ctx->index = 0;
    }
    
    #define COMPRESS(ctx, data) (_nettle_md5_compress((ctx)->state, (data)))
    
    void
    md5_update(struct md5_ctx *ctx,
    	   size_t length,
    	   const uint8_t *data)
    {
      MD_UPDATE(ctx, length, data, COMPRESS, ctx->count++);
    }
    
    void
    md5_digest(struct md5_ctx *ctx,
    	   size_t length,
    	   uint8_t *digest)
    {
      uint64_t bit_count;
      
      assert(length <= MD5_DIGEST_SIZE);
    
      MD_PAD(ctx, 8, COMPRESS);
    
      /* There are 512 = 2^9 bits in one block */
      bit_count = (ctx->count << 9) | (ctx->index << 3);
    
      LE_WRITE_UINT64(ctx->block + (MD5_BLOCK_SIZE - 8), bit_count);
      _nettle_md5_compress(ctx->state, ctx->block);
    
      _nettle_write_le32(length, digest, ctx->state);
      md5_init(ctx);
    }