gl/md4.h

   1 /* Declarations of functions and data types used for MD4 sum
   2    library functions.
   3    Copyright (C) 2000, 2001, 2003, 2005 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify it
   6    under the terms of the GNU General Public License as published by the
   7    Free Software Foundation; either version 2, or (at your option) any
   8    later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 #ifndef MD4_H
  20 # define MD4_H 1
  21
  22 # include <stdio.h>
  23 # include <stdint.h>
  24
  25 # define MD4_DIGEST_SIZE 16
  26
  27 /* Structure to save state of computation between the single steps.  */
  28 struct md4_ctx
  29 {
  30   uint32_t A;
  31   uint32_t B;
  32   uint32_t C;
  33   uint32_t D;
  34
  35   uint32_t total[2];
  36   uint32_t buflen;
  37   uint32_t buffer[32];
  38 };
  39
  40
  41 /* Initialize structure containing state of computation. */
  42 extern void md4_init_ctx (struct md4_ctx *ctx);
  43
  44 /* Starting with the result of former calls of this function (or the
  45    initialization function update the context for the next LEN bytes
  46    starting at BUFFER.
  47    It is necessary that LEN is a multiple of 64!!! */
  48 extern void md4_process_block (const void *buffer, size_t len,
  49                                struct md4_ctx *ctx);
  50
  51 /* Starting with the result of former calls of this function (or the
  52    initialization function update the context for the next LEN bytes
  53    starting at BUFFER.
  54    It is NOT required that LEN is a multiple of 64.  */
  55 extern void md4_process_bytes (const void *buffer, size_t len,
  56                                struct md4_ctx *ctx);
  57
  58 /* Process the remaining bytes in the buffer and put result from CTX
  59    in first 16 bytes following RESBUF.  The result is always in little
  60    endian byte order, so that a byte-wise output yields to the wanted
  61    ASCII representation of the message digest.
  62
  63    IMPORTANT: On some systems it is required that RESBUF be correctly
  64    aligned for a 32 bits value.  */
  65 extern void *md4_finish_ctx (struct md4_ctx *ctx, void *resbuf);
  66
  67
  68 /* Put result from CTX in first 16 bytes following RESBUF.  The result is
  69    always in little endian byte order, so that a byte-wise output yields
  70    to the wanted ASCII representation of the message digest.
  71
  72    IMPORTANT: On some systems it is required that RESBUF is correctly
  73    aligned for a 32 bits value.  */
  74 extern void *md4_read_ctx (const struct md4_ctx *ctx, void *resbuf);
  75
  76
  77 /* Compute MD4 message digest for bytes read from STREAM.  The
  78    resulting message digest number will be written into the 16 bytes
  79    beginning at RESBLOCK.  */
  80 extern int md4_stream (FILE * stream, void *resblock);
  81
  82 /* Compute MD4 message digest for LEN bytes beginning at BUFFER.  The
  83    result is always in little endian byte order, so that a byte-wise
  84    output yields to the wanted ASCII representation of the message
  85    digest.  */
  86 extern void *md4_buffer (const char *buffer, size_t len, void *resblock);
  87
  88 #endif