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5191 | serge | 1 | /* md5.h - Declaration of functions and data types used for MD5 sum |
2 | computing library functions. |
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6324 | serge | 3 | Copyright (C) 1995-2015 Free Software Foundation, Inc. |
5191 | serge | 4 | NOTE: The canonical source of this file is maintained with the GNU C |
5 | Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu. |
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6 | |||
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 | |||
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 | |||
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 | |||
21 | #ifndef _MD5_H |
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22 | #define _MD5_H 1 |
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23 | |||
24 | #include |
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25 | |||
26 | #if defined HAVE_LIMITS_H || _LIBC |
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27 | # include |
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28 | #endif |
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29 | |||
30 | #include "ansidecl.h" |
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31 | |||
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 | |||
39 | #ifdef _LIBC |
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40 | # include |
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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 | #elif defined (HAVE_SYS_TYPES_H) && defined (HAVE_STDINT_H) |
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44 | #include |
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45 | #include |
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46 | typedef uint32_t md5_uint32; |
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47 | typedef uintptr_t md5_uintptr; |
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48 | #else |
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49 | # define INT_MAX_32_BITS 2147483647 |
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50 | |||
51 | /* If UINT_MAX isn't defined, assume it's a 32-bit type. |
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52 | This should be valid for all systems GNU cares about because |
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53 | that doesn't include 16-bit systems, and only modern systems |
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54 | (that certainly have |
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55 | |||
56 | # ifndef INT_MAX |
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57 | # define INT_MAX INT_MAX_32_BITS |
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58 | # endif |
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59 | |||
60 | # if INT_MAX == INT_MAX_32_BITS |
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61 | typedef unsigned int md5_uint32; |
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62 | # else |
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63 | # if SHRT_MAX == INT_MAX_32_BITS |
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64 | typedef unsigned short md5_uint32; |
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65 | # else |
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66 | # if LONG_MAX == INT_MAX_32_BITS |
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67 | typedef unsigned long md5_uint32; |
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68 | # else |
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69 | /* The following line is intended to evoke an error. |
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70 | Using #error is not portable enough. */ |
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71 | "Cannot determine unsigned 32-bit data type." |
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72 | # endif |
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73 | # endif |
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74 | # endif |
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75 | /* We have to make a guess about the integer type equivalent in size |
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76 | to pointers which should always be correct. */ |
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77 | typedef unsigned long int md5_uintptr; |
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78 | #endif |
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79 | |||
80 | #ifdef __cplusplus |
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81 | extern "C" { |
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82 | #endif |
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83 | |||
84 | /* Structure to save state of computation between the single steps. */ |
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85 | struct md5_ctx |
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86 | { |
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87 | md5_uint32 A; |
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88 | md5_uint32 B; |
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89 | md5_uint32 C; |
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90 | md5_uint32 D; |
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91 | |||
92 | md5_uint32 total[2]; |
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93 | md5_uint32 buflen; |
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94 | char buffer[128] ATTRIBUTE_ALIGNED_ALIGNOF(md5_uint32); |
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95 | }; |
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96 | |||
97 | /* |
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98 | * The following three functions are build up the low level used in |
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99 | * the functions `md5_stream' and `md5_buffer'. |
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100 | */ |
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101 | |||
102 | /* Initialize structure containing state of computation. |
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103 | (RFC 1321, 3.3: Step 3) */ |
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104 | extern void md5_init_ctx (struct md5_ctx *ctx); |
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105 | |||
106 | /* Starting with the result of former calls of this function (or the |
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107 | initialization function update the context for the next LEN bytes |
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108 | starting at BUFFER. |
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109 | It is necessary that LEN is a multiple of 64!!! */ |
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110 | extern void md5_process_block (const void *buffer, size_t len, |
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111 | struct md5_ctx *ctx); |
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112 | |||
113 | /* Starting with the result of former calls of this function (or the |
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114 | initialization function update the context for the next LEN bytes |
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115 | starting at BUFFER. |
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116 | It is NOT required that LEN is a multiple of 64. */ |
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117 | extern void md5_process_bytes (const void *buffer, size_t len, |
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118 | struct md5_ctx *ctx); |
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119 | |||
120 | /* Process the remaining bytes in the buffer and put result from CTX |
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121 | in first 16 bytes following RESBUF. The result is always in little |
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122 | endian byte order, so that a byte-wise output yields to the wanted |
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123 | ASCII representation of the message digest. |
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124 | |||
125 | IMPORTANT: On some systems it is required that RESBUF is correctly |
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126 | aligned for a 32 bits value. */ |
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127 | extern void *md5_finish_ctx (struct md5_ctx *ctx, void *resbuf); |
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128 | |||
129 | |||
130 | /* Put result from CTX in first 16 bytes following RESBUF. The result is |
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131 | always in little endian byte order, so that a byte-wise output yields |
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132 | to the wanted ASCII representation of the message digest. |
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133 | |||
134 | IMPORTANT: On some systems it is required that RESBUF is correctly |
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135 | aligned for a 32 bits value. */ |
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136 | extern void *md5_read_ctx (const struct md5_ctx *ctx, void *resbuf); |
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137 | |||
138 | |||
139 | /* Compute MD5 message digest for bytes read from STREAM. The |
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140 | resulting message digest number will be written into the 16 bytes |
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141 | beginning at RESBLOCK. */ |
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142 | extern int md5_stream (FILE *stream, void *resblock); |
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143 | |||
144 | /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The |
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145 | result is always in little endian byte order, so that a byte-wise |
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146 | output yields to the wanted ASCII representation of the message |
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147 | digest. */ |
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148 | extern void *md5_buffer (const char *buffer, size_t len, void *resblock); |
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149 | |||
150 | #ifdef __cplusplus |
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151 | } |
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152 | #endif |
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153 | |||
154 | #endif |