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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, 1996, 1997 Free Software Foundation, Inc. |
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4 This file is part of the GNU C Library. |
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5 |
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6 The GNU C Library is free software; you can redistribute it and/or |
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7 modify it under the terms of the GNU Library General Public License as |
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8 published by the Free Software Foundation; either version 2 of the |
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9 License, or (at your option) any later version. |
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10 |
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11 The GNU C Library is distributed in the hope that it will be useful, |
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 Library General Public License for more details. |
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15 |
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16 You should have received a copy of the GNU Library General Public |
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17 License along with the GNU C Library; see the file COPYING.LIB. If not, |
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18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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19 Boston, MA 02111-1307, 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 /* The following contortions are an attempt to use the C preprocessor |
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31 to determine an unsigned integral type that is 32 bits wide. An |
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32 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but |
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33 doing that would require that the configure script compile and *run* |
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34 the resulting executable. Locally running cross-compiled executables |
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35 is usually not possible. */ |
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36 |
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37 #ifdef _LIBC |
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38 # include <sys/types.h> |
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39 typedef u_int32_t md5_uint32; |
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40 #else |
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41 # if defined __STDC__ && __STDC__ |
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42 # define UINT_MAX_32_BITS 4294967295U |
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43 # else |
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44 # define UINT_MAX_32_BITS 0xFFFFFFFF |
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45 # endif |
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46 |
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47 /* If UINT_MAX isn't defined, assume it's a 32-bit type. |
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48 This should be valid for all systems GNU cares about because |
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49 that doesn't include 16-bit systems, and only modern systems |
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50 (that certainly have <limits.h>) have 64+-bit integral types. */ |
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51 |
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52 # ifndef UINT_MAX |
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53 # define UINT_MAX UINT_MAX_32_BITS |
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54 # endif |
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55 |
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56 # if UINT_MAX == UINT_MAX_32_BITS |
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57 typedef unsigned int md5_uint32; |
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58 # else |
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59 # if USHRT_MAX == UINT_MAX_32_BITS |
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60 typedef unsigned short md5_uint32; |
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61 # else |
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62 # if ULONG_MAX == UINT_MAX_32_BITS |
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63 typedef unsigned long md5_uint32; |
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64 # else |
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65 /* The following line is intended to evoke an error. |
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66 Using #error is not portable enough. */ |
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67 "Cannot determine unsigned 32-bit data type." |
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68 # endif |
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69 # endif |
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70 # endif |
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71 #endif |
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72 |
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73 #undef __P |
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74 #if defined (__STDC__) && __STDC__ |
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75 # define __P(x) x |
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76 #else |
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77 # define __P(x) () |
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78 #endif |
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79 |
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80 /* Structure to save state of computation between the single steps. */ |
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81 struct md5_ctx |
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82 { |
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83 md5_uint32 A; |
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84 md5_uint32 B; |
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85 md5_uint32 C; |
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86 md5_uint32 D; |
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87 |
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88 md5_uint32 total[2]; |
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89 md5_uint32 buflen; |
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90 char buffer[128]; |
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91 }; |
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92 |
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93 /* |
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94 * The following three functions are build up the low level used in |
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95 * the functions `md5_stream' and `md5_buffer'. |
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96 */ |
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97 |
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98 /* Initialize structure containing state of computation. |
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99 (RFC 1321, 3.3: Step 3) */ |
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100 extern void __md5_init_ctx __P ((struct md5_ctx *ctx)); |
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101 extern void md5_init_ctx __P ((struct md5_ctx *ctx)); |
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102 |
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103 /* Starting with the result of former calls of this function (or the |
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104 initialization function update the context for the next LEN bytes |
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105 starting at BUFFER. |
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106 It is necessary that LEN is a multiple of 64!!! */ |
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107 extern void __md5_process_block __P ((const void *buffer, size_t len, |
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108 struct md5_ctx *ctx)); |
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109 extern void md5_process_block __P ((const void *buffer, size_t len, |
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110 struct md5_ctx *ctx)); |
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111 |
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112 /* Starting with the result of former calls of this function (or the |
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113 initialization function update the context for the next LEN bytes |
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114 starting at BUFFER. |
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115 It is NOT required that LEN is a multiple of 64. */ |
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116 extern void __md5_process_bytes __P ((const void *buffer, size_t len, |
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117 struct md5_ctx *ctx)); |
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118 extern void md5_process_bytes __P ((const void *buffer, size_t len, |
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119 struct md5_ctx *ctx)); |
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120 |
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121 /* Process the remaining bytes in the buffer and put result from CTX |
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122 in first 16 bytes following RESBUF. The result is always in little |
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123 endian byte order, so that a byte-wise output yields to the wanted |
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124 ASCII representation of the message digest. |
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125 |
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126 IMPORTANT: On some systems it is required that RESBUF is correctly |
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127 aligned for a 32 bits value. */ |
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128 extern void *__md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf)); |
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129 extern void *md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf)); |
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130 |
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131 |
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132 /* Put result from CTX in first 16 bytes following RESBUF. The result is |
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133 always in little endian byte order, so that a byte-wise output yields |
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134 to the wanted ASCII representation of the message digest. |
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135 |
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136 IMPORTANT: On some systems it is required that RESBUF is correctly |
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137 aligned for a 32 bits value. */ |
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138 extern void *__md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf)); |
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139 extern void *md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf)); |
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140 |
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141 |
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142 /* Compute MD5 message digest for bytes read from STREAM. The |
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143 resulting message digest number will be written into the 16 bytes |
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144 beginning at RESBLOCK. */ |
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145 extern int __md5_stream __P ((FILE *stream, void *resblock)); |
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146 |
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147 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The |
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148 result is always in little endian byte order, so that a byte-wise |
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149 output yields to the wanted ASCII representation of the message |
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150 digest. */ |
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151 extern void *__md5_buffer __P ((const char *buffer, size_t len, |
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152 void *resblock)); |
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153 extern void *md5_buffer __P ((const char *buffer, size_t len, |
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154 void *resblock)); |
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155 |
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156 #endif /* md5.h */ |