lib/sha512.h

   1 /* Declarations of functions and data types used for SHA512 and SHA384 sum
   2    library functions.
   3    Copyright (C) 2005-2006, 2008-2012 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation, either version 3 of the License, or
   8    (at your option) any 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, see <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef SHA512_H
  19 # define SHA512_H 1
  20
  21 # include <stdio.h>
  22
  23 # include "u64.h"
  24
  25 # ifdef __cplusplus
  26 extern "C" {
  27 # endif
  28
  29 /* Structure to save state of computation between the single steps.  */
  30 struct sha512_ctx
  31 {
  32   u64 state[8];
  33
  34   u64 total[2];
  35   size_t buflen;
  36   u64 buffer[32];
  37 };
  38
  39 enum { SHA384_DIGEST_SIZE = 384 / 8 };
  40 enum { SHA512_DIGEST_SIZE = 512 / 8 };
  41
  42 /* Initialize structure containing state of computation. */
  43 extern void sha512_init_ctx (struct sha512_ctx *ctx);
  44 extern void sha384_init_ctx (struct sha512_ctx *ctx);
  45
  46 /* Starting with the result of former calls of this function (or the
  47    initialization function update the context for the next LEN bytes
  48    starting at BUFFER.
  49    It is necessary that LEN is a multiple of 128!!! */
  50 extern void sha512_process_block (const void *buffer, size_t len,
  51                                   struct sha512_ctx *ctx);
  52
  53 /* Starting with the result of former calls of this function (or the
  54    initialization function update the context for the next LEN bytes
  55    starting at BUFFER.
  56    It is NOT required that LEN is a multiple of 128.  */
  57 extern void sha512_process_bytes (const void *buffer, size_t len,
  58                                   struct sha512_ctx *ctx);
  59
  60 /* Process the remaining bytes in the buffer and put result from CTX
  61    in first 64 (48) bytes following RESBUF.  The result is always in little
  62    endian byte order, so that a byte-wise output yields to the wanted
  63    ASCII representation of the message digest.  */
  64 extern void *sha512_finish_ctx (struct sha512_ctx *ctx, void *resbuf);
  65 extern void *sha384_finish_ctx (struct sha512_ctx *ctx, void *resbuf);
  66
  67
  68 /* Put result from CTX in first 64 (48) 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 *sha512_read_ctx (const struct sha512_ctx *ctx, void *resbuf);
  75 extern void *sha384_read_ctx (const struct sha512_ctx *ctx, void *resbuf);
  76
  77
  78 /* Compute SHA512 (SHA384) message digest for bytes read from STREAM.  The
  79    resulting message digest number will be written into the 64 (48) bytes
  80    beginning at RESBLOCK.  */
  81 extern int sha512_stream (FILE *stream, void *resblock);
  82 extern int sha384_stream (FILE *stream, void *resblock);
  83
  84 /* Compute SHA512 (SHA384) message digest for LEN bytes beginning at BUFFER.  The
  85    result is always in little endian byte order, so that a byte-wise
  86    output yields to the wanted ASCII representation of the message
  87    digest.  */
  88 extern void *sha512_buffer (const char *buffer, size_t len, void *resblock);
  89 extern void *sha384_buffer (const char *buffer, size_t len, void *resblock);
  90
  91 # ifdef __cplusplus
  92 }
  93 # endif
  94
  95 #endif