lgl/md2.h

   1 /* Declarations of functions and data types used for MD2 sum
   2    library functions.
   3    Copyright (C) 2000, 2001, 2003, 2005, 2008 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 Lesser General Public License as published by the
   7    Free Software Foundation; either version 2.1, 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 Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser 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 MD2_H
  20 # define MD2_H 1
  21
  22 # include <stdio.h>
  23 # include <stddef.h>
  24
  25 # define MD2_DIGEST_SIZE 16
  26
  27 /* Structure to save state of computation between the single steps.  */
  28 struct md2_ctx
  29 {
  30   unsigned char chksum[16], X[48], buf[16];
  31   size_t curlen;
  32 };
  33
  34
  35 /* Initialize structure containing state of computation. */
  36 extern void md2_init_ctx (struct md2_ctx *ctx);
  37
  38 /* Starting with the result of former calls of this function (or the
  39    initialization function update the context for the next LEN bytes
  40    starting at BUFFER.
  41    It is NOT required that LEN is a multiple of 64.  */
  42 extern void md2_process_block (const void *buffer, size_t len,
  43                                struct md2_ctx *ctx);
  44
  45 /* Starting with the result of former calls of this function (or the
  46    initialization function update the context for the next LEN bytes
  47    starting at BUFFER.
  48    It is NOT required that LEN is a multiple of 64.  */
  49 extern void md2_process_bytes (const void *buffer, size_t len,
  50                                struct md2_ctx *ctx);
  51
  52 /* Process the remaining bytes in the buffer and put result from CTX
  53    in first 16 bytes following RESBUF.  The result is always in little
  54    endian byte order, so that a byte-wise output yields to the wanted
  55    ASCII representation of the message digest.  */
  56 extern void *md2_finish_ctx (struct md2_ctx *ctx, void *resbuf);
  57
  58
  59 /* Put result from CTX in first 16 bytes following RESBUF.  The result is
  60    always in little endian byte order, so that a byte-wise output yields
  61    to the wanted ASCII representation of the message digest.  */
  62 extern void *md2_read_ctx (const struct md2_ctx *ctx, void *resbuf);
  63
  64
  65 /* Compute MD2 message digest for bytes read from STREAM.  The
  66    resulting message digest number will be written into the 16 bytes
  67    beginning at RESBLOCK.  */
  68 extern int md2_stream (FILE *stream, void *resblock);
  69
  70 /* Compute MD2 message digest for LEN bytes beginning at BUFFER.  The
  71    result is always in little endian byte order, so that a byte-wise
  72    output yields to the wanted ASCII representation of the message
  73    digest.  */
  74 extern void *md2_buffer (const char *buffer, size_t len, void *resblock);
  75
  76 #endif