lib/md4.h

   1 /* Declarations of functions and data types used for MD4 sum
   2    library functions.
   3    Copyright (C) 2000-2001, 2003, 2005, 2008-2024 Free Software Foundation,
   4    Inc.
   5
   6    This file is free software: you can redistribute it and/or modify
   7    it under the terms of the GNU Lesser General Public License as
   8    published by the Free Software Foundation; either version 2.1 of the
   9    License, or (at your option) any later version.
  10
  11    This file is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public License
  17    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef MD4_H
  20 # define MD4_H 1
  21
  22 # include <stdio.h>
  23 # include <stdint.h>
  24
  25 # ifdef __cplusplus
  26 extern "C" {
  27 # endif
  28
  29 # define MD4_DIGEST_SIZE 16
  30
  31 /* Structure to save state of computation between the single steps.  */
  32 struct md4_ctx
  33 {
  34   uint32_t A;
  35   uint32_t B;
  36   uint32_t C;
  37   uint32_t D;
  38
  39   uint32_t total[2];
  40   uint32_t buflen;
  41   uint32_t buffer[32];
  42 };
  43
  44
  45 /* Initialize structure containing state of computation. */
  46 extern void md4_init_ctx (struct md4_ctx *ctx);
  47
  48 /* Starting with the result of former calls of this function (or the
  49    initialization function update the context for the next LEN bytes
  50    starting at BUFFER.
  51    It is necessary that LEN is a multiple of 64!!! */
  52 extern void md4_process_block (const void *buffer, size_t len,
  53                                struct md4_ctx *ctx);
  54
  55 /* Starting with the result of former calls of this function (or the
  56    initialization function update the context for the next LEN bytes
  57    starting at BUFFER.
  58    It is NOT required that LEN is a multiple of 64.  */
  59 extern void md4_process_bytes (const void *buffer, size_t len,
  60                                struct md4_ctx *ctx);
  61
  62 /* Process the remaining bytes in the buffer and put result from CTX
  63    in first 16 bytes following RESBUF.  The result is always in little
  64    endian byte order, so that a byte-wise output yields to the wanted
  65    ASCII representation of the message digest.  */
  66 extern void *md4_finish_ctx (struct md4_ctx *ctx, void *restrict resbuf);
  67
  68
  69 /* Put result from CTX in first 16 bytes following RESBUF.  The result is
  70    always in little endian byte order, so that a byte-wise output yields
  71    to the wanted ASCII representation of the message digest.  */
  72 extern void *md4_read_ctx (const struct md4_ctx *ctx, void *restrict resbuf);
  73
  74
  75 /* Compute MD4 message digest for LEN bytes beginning at BUFFER.  The
  76    result is always in little endian byte order, so that a byte-wise
  77    output yields to the wanted ASCII representation of the message
  78    digest.  */
  79 extern void *md4_buffer (const char *buffer, size_t len,
  80                          void *restrict resblock);
  81
  82
  83 /* Compute MD4 message digest for bytes read from STREAM.  The
  84    resulting message digest number will be written into the 16 bytes
  85    beginning at RESBLOCK.  */
  86 extern int md4_stream (FILE * stream, void *resblock);
  87
  88
  89 # ifdef __cplusplus
  90 }
  91 # endif
  92
  93 #endif