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5191 | serge | 1 | /* Declarations of functions and data types used for SHA1 sum |
2 | library functions. |
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3 | Copyright (C) 2000, 2001, 2003, 2005, 2006, 2008, 2010 |
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4 | Free Software Foundation, Inc. |
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5 | |||
6 | This program is free software; you can redistribute it and/or modify it |
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7 | under the terms of the GNU General Public License as published by the |
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8 | Free Software Foundation; either version 3, or (at your option) any |
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9 | later version. |
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10 | |||
11 | This program 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 |
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14 | GNU General Public License for more details. |
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15 | |||
16 | You should have received a copy of the GNU General Public License |
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17 | along with this program; if not, write to the Free Software Foundation, |
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18 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
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19 | |||
20 | #ifndef SHA1_H |
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21 | # define SHA1_H 1 |
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22 | |||
23 | #include |
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24 | |||
25 | #if defined HAVE_LIMITS_H || _LIBC |
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26 | # include |
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27 | #endif |
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28 | |||
29 | #include "ansidecl.h" |
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30 | |||
31 | /* The following contortions are an attempt to use the C preprocessor |
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32 | to determine an unsigned integral type that is 32 bits wide. An |
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33 | alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but |
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34 | doing that would require that the configure script compile and *run* |
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35 | the resulting executable. Locally running cross-compiled executables |
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36 | is usually not possible. */ |
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37 | |||
38 | #ifdef _LIBC |
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39 | # include |
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40 | typedef u_int32_t sha1_uint32; |
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41 | typedef uintptr_t sha1_uintptr; |
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42 | #elif defined (HAVE_SYS_TYPES_H) && defined (HAVE_STDINT_H) |
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43 | #include |
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44 | #include |
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45 | typedef uint32_t sha1_uint32; |
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46 | typedef uintptr_t sha1_uintptr; |
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47 | #else |
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48 | # define INT_MAX_32_BITS 2147483647 |
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49 | |||
50 | /* If UINT_MAX isn't defined, assume it's a 32-bit type. |
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51 | This should be valid for all systems GNU cares about because |
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52 | that doesn't include 16-bit systems, and only modern systems |
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53 | (that certainly have |
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54 | |||
55 | # ifndef INT_MAX |
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56 | # define INT_MAX INT_MAX_32_BITS |
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57 | # endif |
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58 | |||
59 | # if INT_MAX == INT_MAX_32_BITS |
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60 | typedef unsigned int sha1_uint32; |
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61 | # else |
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62 | # if SHRT_MAX == INT_MAX_32_BITS |
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63 | typedef unsigned short sha1_uint32; |
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64 | # else |
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65 | # if LONG_MAX == INT_MAX_32_BITS |
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66 | typedef unsigned long sha1_uint32; |
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67 | # else |
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68 | /* The following line is intended to evoke an error. |
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69 | Using #error is not portable enough. */ |
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70 | "Cannot determine unsigned 32-bit data type." |
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71 | # endif |
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72 | # endif |
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73 | # endif |
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74 | #endif |
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75 | |||
76 | #ifdef __cplusplus |
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77 | extern "C" { |
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78 | #endif |
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79 | |||
80 | /* Structure to save state of computation between the single steps. */ |
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81 | struct sha1_ctx |
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82 | { |
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83 | sha1_uint32 A; |
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84 | sha1_uint32 B; |
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85 | sha1_uint32 C; |
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86 | sha1_uint32 D; |
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87 | sha1_uint32 E; |
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88 | |||
89 | sha1_uint32 total[2]; |
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90 | sha1_uint32 buflen; |
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91 | sha1_uint32 buffer[32]; |
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92 | }; |
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93 | |||
94 | |||
95 | /* Initialize structure containing state of computation. */ |
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96 | extern void sha1_init_ctx (struct sha1_ctx *ctx); |
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97 | |||
98 | /* Starting with the result of former calls of this function (or the |
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99 | initialization function update the context for the next LEN bytes |
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100 | starting at BUFFER. |
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101 | It is necessary that LEN is a multiple of 64!!! */ |
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102 | extern void sha1_process_block (const void *buffer, size_t len, |
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103 | struct sha1_ctx *ctx); |
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104 | |||
105 | /* Starting with the result of former calls of this function (or the |
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106 | initialization function update the context for the next LEN bytes |
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107 | starting at BUFFER. |
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108 | It is NOT required that LEN is a multiple of 64. */ |
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109 | extern void sha1_process_bytes (const void *buffer, size_t len, |
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110 | struct sha1_ctx *ctx); |
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111 | |||
112 | /* Process the remaining bytes in the buffer and put result from CTX |
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113 | in first 20 bytes following RESBUF. The result is always in little |
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114 | endian byte order, so that a byte-wise output yields to the wanted |
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115 | ASCII representation of the message digest. |
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116 | |||
117 | IMPORTANT: On some systems it is required that RESBUF be correctly |
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118 | aligned for a 32 bits value. */ |
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119 | extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf); |
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120 | |||
121 | |||
122 | /* Put result from CTX in first 20 bytes following RESBUF. The result is |
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123 | always in little endian byte order, so that a byte-wise output yields |
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124 | to the wanted ASCII representation of the message digest. |
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125 | |||
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 *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf); |
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129 | |||
130 | |||
131 | /* Compute SHA1 message digest for bytes read from STREAM. The |
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132 | resulting message digest number will be written into the 20 bytes |
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133 | beginning at RESBLOCK. */ |
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134 | extern int sha1_stream (FILE *stream, void *resblock); |
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135 | |||
136 | /* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The |
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137 | result is always in little endian byte order, so that a byte-wise |
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138 | output yields to the wanted ASCII representation of the message |
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139 | digest. */ |
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140 | extern void *sha1_buffer (const char *buffer, size_t len, void *resblock); |
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141 | |||
142 | #ifdef __cplusplus |
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143 | } |
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144 | #endif |
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145 | |||
146 | #endif |