md5.h

   1 /* md5.h
   2  *
   3  * The MD5 hash function, described in RFC 1321.
   4  */
   5
   6 /* nettle, low-level cryptographics library
   7  *
   8  * Copyright (C) 2001 Niels Möller
   9  *
  10  * The nettle library is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or (at your
  13  * option) any later version.
  14  *
  15  * The nettle library is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  17  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  18  * License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with the nettle library; see the file COPYING.LIB.  If not, write to
  22  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  23  * MA 02111-1301, USA.
  24  */
  25
  26 #ifndef NETTLE_MD5_H_INCLUDED
  27 #define NETTLE_MD5_H_INCLUDED
  28
  29 #include "nettle-types.h"
  30
  31 #ifdef __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 /* Name mangling */
  36 #define md5_init nettle_md5_init
  37 #define md5_update nettle_md5_update
  38 #define md5_digest nettle_md5_digest
  39
  40 #define MD5_DIGEST_SIZE 16
  41 #define MD5_DATA_SIZE 64
  42
  43 /* Digest is kept internally as 4 32-bit words. */
  44 #define _MD5_DIGEST_LENGTH 4
  45
  46 struct md5_ctx
  47 {
  48   uint32_t state[_MD5_DIGEST_LENGTH];
  49   uint64_t count;               /* Block count */
  50   uint8_t block[MD5_DATA_SIZE]; /* Block buffer */
  51   unsigned index;               /* Into buffer */
  52 };
  53
  54 void
  55 md5_init(struct md5_ctx *ctx);
  56
  57 void
  58 md5_update(struct md5_ctx *ctx,
  59            size_t length,
  60            const uint8_t *data);
  61
  62 void
  63 md5_digest(struct md5_ctx *ctx,
  64            size_t length,
  65            uint8_t *digest);
  66
  67 /* Internal compression function. STATE points to 4 uint32_t words,
  68    and DATA points to 64 bytes of input data, possibly unaligned. */
  69 void
  70 _nettle_md5_compress(uint32_t *state, const uint8_t *data);
  71
  72 #ifdef __cplusplus
  73 }
  74 #endif
  75
  76 #endif /* NETTLE_MD5_H_INCLUDED */