lib/sha1.h

   1 /* Declarations of functions and data types used for SHA1 sum
   2    library functions.
   3    Copyright (C) 2000-2001, 2003, 2005-2006, 2008-2012 Free Software
   4    Foundation, Inc.
   5
   6    This program is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by the
   8    Free Software Foundation; either version 3, or (at your option) any
   9    later version.
  10
  11    This program 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 General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef SHA1_H
  20 # define SHA1_H 1
  21
  22 # include <stdio.h>
  23 # include <stdint.h>
  24
  25 # ifdef __cplusplus
  26 extern "C" {
  27 # endif
  28
  29 #define SHA1_DIGEST_SIZE 20
  30
  31 /* Structure to save state of computation between the single steps.  */
  32 struct sha1_ctx
  33 {
  34   uint32_t A;
  35   uint32_t B;
  36   uint32_t C;
  37   uint32_t D;
  38   uint32_t E;
  39
  40   uint32_t total[2];
  41   uint32_t buflen;
  42   uint32_t buffer[32];
  43 };
  44
  45
  46 /* Initialize structure containing state of computation. */
  47 extern void sha1_init_ctx (struct sha1_ctx *ctx);
  48
  49 /* Starting with the result of former calls of this function (or the
  50    initialization function update the context for the next LEN bytes
  51    starting at BUFFER.
  52    It is necessary that LEN is a multiple of 64!!! */
  53 extern void sha1_process_block (const void *buffer, size_t len,
  54                                 struct sha1_ctx *ctx);
  55
  56 /* Starting with the result of former calls of this function (or the
  57    initialization function update the context for the next LEN bytes
  58    starting at BUFFER.
  59    It is NOT required that LEN is a multiple of 64.  */
  60 extern void sha1_process_bytes (const void *buffer, size_t len,
  61                                 struct sha1_ctx *ctx);
  62
  63 /* Process the remaining bytes in the buffer and put result from CTX
  64    in first 20 bytes following RESBUF.  The result is always in little
  65    endian byte order, so that a byte-wise output yields to the wanted
  66    ASCII representation of the message digest.  */
  67 extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf);
  68
  69
  70 /* Put result from CTX in first 20 bytes following RESBUF.  The result is
  71    always in little endian byte order, so that a byte-wise output yields
  72    to the wanted ASCII representation of the message digest.  */
  73 extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf);
  74
  75
  76 /* Compute SHA1 message digest for bytes read from STREAM.  The
  77    resulting message digest number will be written into the 20 bytes
  78    beginning at RESBLOCK.  */
  79 extern int sha1_stream (FILE *stream, void *resblock);
  80
  81 /* Compute SHA1 message digest for LEN bytes beginning at BUFFER.  The
  82    result is always in little endian byte order, so that a byte-wise
  83    output yields to the wanted ASCII representation of the message
  84    digest.  */
  85 extern void *sha1_buffer (const char *buffer, size_t len, void *resblock);
  86
  87 # ifdef __cplusplus
  88 }
  89 # endif
  90
  91 #endif