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1 /* md5.h - Declaration of functions and data types used for MD5 sum
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2 computing library functions.
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3 Copyright 1995, 1996, 2000 Free Software Foundation, Inc.
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4 NOTE: The canonical source of this file is maintained with the GNU C
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5 Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu.
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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, write to the Free Software Foundation,
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19 Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
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20
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21 #ifndef _MD5_H
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22 #define _MD5_H 1
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23
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24 #include <stdio.h>
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25
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26 #if defined HAVE_LIMITS_H || _LIBC
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27 # include <limits.h>
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28 #endif
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29
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30 #include "ansidecl.h"
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31
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32 /* The following contortions are an attempt to use the C preprocessor
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33 to determine an unsigned integral type that is 32 bits wide. An
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34 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
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35 doing that would require that the configure script compile and *run*
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36 the resulting executable. Locally running cross-compiled executables
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37 is usually not possible. */
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38
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39 #ifdef _LIBC
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40 # include <sys/types.h>
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41 typedef u_int32_t md5_uint32;
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42 typedef uintptr_t md5_uintptr;
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43 #else
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44 # define INT_MAX_32_BITS 2147483647
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45
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46 /* If UINT_MAX isn't defined, assume it's a 32-bit type.
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47 This should be valid for all systems GNU cares about because
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48 that doesn't include 16-bit systems, and only modern systems
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49 (that certainly have <limits.h>) have 64+-bit integral types. */
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50
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51 # ifndef INT_MAX
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52 # define INT_MAX INT_MAX_32_BITS
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53 # endif
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54
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55 # if INT_MAX == INT_MAX_32_BITS
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56 typedef unsigned int md5_uint32;
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57 # else
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58 # if SHRT_MAX == INT_MAX_32_BITS
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59 typedef unsigned short md5_uint32;
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60 # else
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61 # if LONG_MAX == INT_MAX_32_BITS
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62 typedef unsigned long md5_uint32;
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63 # else
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64 /* The following line is intended to evoke an error.
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65 Using #error is not portable enough. */
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66 "Cannot determine unsigned 32-bit data type."
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67 # endif
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68 # endif
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69 # endif
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70 /* We have to make a guess about the integer type equivalent in size
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71 to pointers which should always be correct. */
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72 typedef unsigned long int md5_uintptr;
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73 #endif
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74
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75 #ifdef __cplusplus
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76 extern "C" {
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77 #endif
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78
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79 /* Structure to save state of computation between the single steps. */
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80 struct md5_ctx
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81 {
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82 md5_uint32 A;
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83 md5_uint32 B;
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84 md5_uint32 C;
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85 md5_uint32 D;
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86
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87 md5_uint32 total[2];
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88 md5_uint32 buflen;
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89 char buffer[128] ATTRIBUTE_ALIGNED_ALIGNOF(md5_uint32);
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90 };
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91
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92 /*
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93 * The following three functions are build up the low level used in
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94 * the functions `md5_stream' and `md5_buffer'.
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95 */
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96
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97 /* Initialize structure containing state of computation.
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98 (RFC 1321, 3.3: Step 3) */
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99 extern void md5_init_ctx (struct md5_ctx *ctx);
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100
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101 /* Starting with the result of former calls of this function (or the
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102 initialization function update the context for the next LEN bytes
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103 starting at BUFFER.
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104 It is necessary that LEN is a multiple of 64!!! */
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105 extern void md5_process_block (const void *buffer, size_t len,
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106 struct md5_ctx *ctx);
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107
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108 /* Starting with the result of former calls of this function (or the
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109 initialization function update the context for the next LEN bytes
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110 starting at BUFFER.
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111 It is NOT required that LEN is a multiple of 64. */
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112 extern void md5_process_bytes (const void *buffer, size_t len,
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113 struct md5_ctx *ctx);
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114
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115 /* Process the remaining bytes in the buffer and put result from CTX
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116 in first 16 bytes following RESBUF. The result is always in little
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117 endian byte order, so that a byte-wise output yields to the wanted
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118 ASCII representation of the message digest.
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119
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120 IMPORTANT: On some systems it is required that RESBUF is correctly
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121 aligned for a 32 bits value. */
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122 extern void *md5_finish_ctx (struct md5_ctx *ctx, void *resbuf);
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123
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124
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125 /* Put result from CTX in first 16 bytes following RESBUF. The result is
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126 always in little endian byte order, so that a byte-wise output yields
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127 to the wanted ASCII representation of the message digest.
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128
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129 IMPORTANT: On some systems it is required that RESBUF is correctly
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130 aligned for a 32 bits value. */
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131 extern void *md5_read_ctx (const struct md5_ctx *ctx, void *resbuf);
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132
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133
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134 /* Compute MD5 message digest for bytes read from STREAM. The
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135 resulting message digest number will be written into the 16 bytes
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136 beginning at RESBLOCK. */
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137 extern int md5_stream (FILE *stream, void *resblock);
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138
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139 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
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140 result is always in little endian byte order, so that a byte-wise
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141 output yields to the wanted ASCII representation of the message
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142 digest. */
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143 extern void *md5_buffer (const char *buffer, size_t len, void *resblock);
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144
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145 #ifdef __cplusplus
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146 }
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147 #endif
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148
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149 #endif
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