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Rev | Author | Line No. | Line |
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5191 | serge | 1 | /* Declarations of functions and data types used for SHA1 sum |
2 | library functions. |
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6324 | serge | 3 | Copyright (C) 2000-2015 Free Software Foundation, Inc. |
5191 | serge | 4 | |
5 | This program is free software; you can redistribute it and/or modify it |
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6 | under the terms of the GNU General Public License as published by the |
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7 | Free Software Foundation; either version 3, or (at your option) any |
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8 | later version. |
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9 | |||
10 | This program is distributed in the hope that it will be useful, |
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | GNU General Public License for more details. |
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14 | |||
15 | You should have received a copy of the GNU General Public License |
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16 | along with this program; if not, write to the Free Software Foundation, |
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17 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
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18 | |||
19 | #ifndef SHA1_H |
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20 | # define SHA1_H 1 |
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21 | |||
22 | #include |
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23 | |||
24 | #if defined HAVE_LIMITS_H || _LIBC |
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25 | # include |
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26 | #endif |
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27 | |||
28 | #include "ansidecl.h" |
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29 | |||
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 | |||
37 | #ifdef _LIBC |
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38 | # include |
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39 | typedef u_int32_t sha1_uint32; |
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40 | typedef uintptr_t sha1_uintptr; |
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41 | #elif defined (HAVE_SYS_TYPES_H) && defined (HAVE_STDINT_H) |
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42 | #include |
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43 | #include |
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44 | typedef uint32_t sha1_uint32; |
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45 | typedef uintptr_t sha1_uintptr; |
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46 | #else |
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47 | # define INT_MAX_32_BITS 2147483647 |
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48 | |||
49 | /* If UINT_MAX isn't defined, assume it's a 32-bit type. |
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50 | This should be valid for all systems GNU cares about because |
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51 | that doesn't include 16-bit systems, and only modern systems |
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52 | (that certainly have |
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53 | |||
54 | # ifndef INT_MAX |
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55 | # define INT_MAX INT_MAX_32_BITS |
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56 | # endif |
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57 | |||
58 | # if INT_MAX == INT_MAX_32_BITS |
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59 | typedef unsigned int sha1_uint32; |
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60 | # else |
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61 | # if SHRT_MAX == INT_MAX_32_BITS |
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62 | typedef unsigned short sha1_uint32; |
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63 | # else |
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64 | # if LONG_MAX == INT_MAX_32_BITS |
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65 | typedef unsigned long sha1_uint32; |
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66 | # else |
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67 | /* The following line is intended to evoke an error. |
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68 | Using #error is not portable enough. */ |
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69 | "Cannot determine unsigned 32-bit data type." |
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70 | # endif |
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71 | # endif |
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72 | # endif |
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73 | #endif |
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74 | |||
75 | #ifdef __cplusplus |
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76 | extern "C" { |
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77 | #endif |
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78 | |||
79 | /* Structure to save state of computation between the single steps. */ |
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80 | struct sha1_ctx |
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81 | { |
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82 | sha1_uint32 A; |
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83 | sha1_uint32 B; |
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84 | sha1_uint32 C; |
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85 | sha1_uint32 D; |
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86 | sha1_uint32 E; |
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87 | |||
88 | sha1_uint32 total[2]; |
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89 | sha1_uint32 buflen; |
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90 | sha1_uint32 buffer[32]; |
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91 | }; |
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92 | |||
93 | |||
94 | /* Initialize structure containing state of computation. */ |
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95 | extern void sha1_init_ctx (struct sha1_ctx *ctx); |
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96 | |||
97 | /* Starting with the result of former calls of this function (or the |
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98 | initialization function update the context for the next LEN bytes |
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99 | starting at BUFFER. |
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100 | It is necessary that LEN is a multiple of 64!!! */ |
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101 | extern void sha1_process_block (const void *buffer, size_t len, |
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102 | struct sha1_ctx *ctx); |
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103 | |||
104 | /* Starting with the result of former calls of this function (or the |
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105 | initialization function update the context for the next LEN bytes |
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106 | starting at BUFFER. |
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107 | It is NOT required that LEN is a multiple of 64. */ |
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108 | extern void sha1_process_bytes (const void *buffer, size_t len, |
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109 | struct sha1_ctx *ctx); |
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110 | |||
111 | /* Process the remaining bytes in the buffer and put result from CTX |
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112 | in first 20 bytes following RESBUF. The result is always in little |
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113 | endian byte order, so that a byte-wise output yields to the wanted |
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114 | ASCII representation of the message digest. |
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115 | |||
116 | IMPORTANT: On some systems it is required that RESBUF be correctly |
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117 | aligned for a 32 bits value. */ |
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118 | extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf); |
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119 | |||
120 | |||
121 | /* Put result from CTX in first 20 bytes following RESBUF. The result is |
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122 | always in little endian byte order, so that a byte-wise output yields |
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123 | to the wanted 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 *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf); |
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128 | |||
129 | |||
130 | /* Compute SHA1 message digest for bytes read from STREAM. The |
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131 | resulting message digest number will be written into the 20 bytes |
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132 | beginning at RESBLOCK. */ |
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133 | extern int sha1_stream (FILE *stream, void *resblock); |
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134 | |||
135 | /* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The |
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136 | result is always in little endian byte order, so that a byte-wise |
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137 | output yields to the wanted ASCII representation of the message |
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138 | digest. */ |
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139 | extern void *sha1_buffer (const char *buffer, size_t len, void *resblock); |
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140 | |||
141 | #ifdef __cplusplus |
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142 | } |
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143 | #endif |
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144 | |||
145 | #endif |