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annotate lib/md5.h @ 17255:d81be792518a

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update from texinfo
author Karl Berry <karl@freefriends.org>
date Tue, 01 Jan 2013 15:51:49 -0800
parents e542fd46ad6f
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1 /* Declaration of functions and data types used for MD5 sum computing
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2 library functions.
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3 Copyright (C) 1995-1997, 1999-2001, 2004-2006, 2008-2013 Free Software
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4 Foundation, Inc.
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5 This file is part of the GNU C Library.
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6
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7 This program is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 This program is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with this program; if not, see <http://www.gnu.org/licenses/>. */
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19
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20 #ifndef _MD5_H
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21 #define _MD5_H 1
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22
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23 #include <stdio.h>
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24 #include <stdint.h>
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25
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26 #define MD5_DIGEST_SIZE 16
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27 #define MD5_BLOCK_SIZE 64
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28
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29 #ifndef __GNUC_PREREQ
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30 # if defined __GNUC__ && defined __GNUC_MINOR__
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31 # define __GNUC_PREREQ(maj, min) \
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32 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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33 # else
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34 # define __GNUC_PREREQ(maj, min) 0
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35 # endif
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36 #endif
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37
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38 #ifndef __THROW
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39 # if defined __cplusplus && __GNUC_PREREQ (2,8)
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40 # define __THROW throw ()
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41 # else
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42 # define __THROW
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43 # endif
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44 #endif
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45
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46 #ifndef _LIBC
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47 # define __md5_buffer md5_buffer
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48 # define __md5_finish_ctx md5_finish_ctx
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49 # define __md5_init_ctx md5_init_ctx
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50 # define __md5_process_block md5_process_block
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51 # define __md5_process_bytes md5_process_bytes
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52 # define __md5_read_ctx md5_read_ctx
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53 # define __md5_stream md5_stream
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54 #endif
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55
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56 # ifdef __cplusplus
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57 extern "C" {
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58 # endif
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59
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60 /* Structure to save state of computation between the single steps. */
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61 struct md5_ctx
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62 {
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63 uint32_t A;
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64 uint32_t B;
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65 uint32_t C;
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66 uint32_t D;
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67
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68 uint32_t total[2];
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69 uint32_t buflen;
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70 uint32_t buffer[32];
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71 };
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72
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73 /*
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74 * The following three functions are build up the low level used in
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75 * the functions 'md5_stream' and 'md5_buffer'.
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76 */
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77
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78 /* Initialize structure containing state of computation.
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79 (RFC 1321, 3.3: Step 3) */
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80 extern void __md5_init_ctx (struct md5_ctx *ctx) __THROW;
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81
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82 /* Starting with the result of former calls of this function (or the
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83 initialization function update the context for the next LEN bytes
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84 starting at BUFFER.
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85 It is necessary that LEN is a multiple of 64!!! */
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86 extern void __md5_process_block (const void *buffer, size_t len,
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87 struct md5_ctx *ctx) __THROW;
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88
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89 /* Starting with the result of former calls of this function (or the
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90 initialization function update the context for the next LEN bytes
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91 starting at BUFFER.
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92 It is NOT required that LEN is a multiple of 64. */
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93 extern void __md5_process_bytes (const void *buffer, size_t len,
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94 struct md5_ctx *ctx) __THROW;
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95
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96 /* Process the remaining bytes in the buffer and put result from CTX
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97 in first 16 bytes following RESBUF. The result is always in little
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98 endian byte order, so that a byte-wise output yields to the wanted
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99 ASCII representation of the message digest. */
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100 extern void *__md5_finish_ctx (struct md5_ctx *ctx, void *resbuf) __THROW;
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101
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102
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103 /* Put result from CTX in first 16 bytes following RESBUF. The result is
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104 always in little endian byte order, so that a byte-wise output yields
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105 to the wanted ASCII representation of the message digest. */
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106 extern void *__md5_read_ctx (const struct md5_ctx *ctx, void *resbuf) __THROW;
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107
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108
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109 /* Compute MD5 message digest for bytes read from STREAM. The
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110 resulting message digest number will be written into the 16 bytes
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111 beginning at RESBLOCK. */
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112 extern int __md5_stream (FILE *stream, void *resblock) __THROW;
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113
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114 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
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115 result is always in little endian byte order, so that a byte-wise
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116 output yields to the wanted ASCII representation of the message
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117 digest. */
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118 extern void *__md5_buffer (const char *buffer, size_t len,
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119 void *resblock) __THROW;
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120
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121 # ifdef __cplusplus
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122 }
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123 # endif
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124
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125 #endif /* md5.h */