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1 /* Declarations of functions and data types used for SHA1 sum
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2 library functions.
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3 Copyright (C) 2000, 2001, 2003, 2005, 2006, 2008
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4 Free Software Foundation, Inc.
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5
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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 2, or (at your option) any
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9 later version.
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10
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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
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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
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20 #ifndef SHA1_H
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21 # define SHA1_H 1
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22
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23 #include <stdio.h>
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24
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25 #if defined HAVE_LIMITS_H || _LIBC
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26 # include <limits.h>
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27 #endif
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28
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29 #include "ansidecl.h"
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30
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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
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38 #ifdef _LIBC
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39 # include <sys/types.h>
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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 #else
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43 # define INT_MAX_32_BITS 2147483647
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44
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45 /* If UINT_MAX isn't defined, assume it's a 32-bit type.
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46 This should be valid for all systems GNU cares about because
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47 that doesn't include 16-bit systems, and only modern systems
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48 (that certainly have <limits.h>) have 64+-bit integral types. */
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49
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50 # ifndef INT_MAX
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51 # define INT_MAX INT_MAX_32_BITS
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52 # endif
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53
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54 # if INT_MAX == INT_MAX_32_BITS
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55 typedef unsigned int sha1_uint32;
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56 # else
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57 # if SHRT_MAX == INT_MAX_32_BITS
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58 typedef unsigned short sha1_uint32;
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59 # else
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60 # if LONG_MAX == INT_MAX_32_BITS
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61 typedef unsigned long sha1_uint32;
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62 # else
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63 /* The following line is intended to evoke an error.
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64 Using #error is not portable enough. */
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65 "Cannot determine unsigned 32-bit data type."
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66 # endif
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67 # endif
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68 # endif
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69 #endif
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70
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71 #ifdef __cplusplus
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72 extern "C" {
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73 #endif
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74
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75 /* Structure to save state of computation between the single steps. */
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76 struct sha1_ctx
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77 {
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78 sha1_uint32 A;
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79 sha1_uint32 B;
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80 sha1_uint32 C;
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81 sha1_uint32 D;
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82 sha1_uint32 E;
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83
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84 sha1_uint32 total[2];
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85 sha1_uint32 buflen;
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86 sha1_uint32 buffer[32];
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87 };
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88
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89
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90 /* Initialize structure containing state of computation. */
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91 extern void sha1_init_ctx (struct sha1_ctx *ctx);
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92
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93 /* Starting with the result of former calls of this function (or the
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94 initialization function update the context for the next LEN bytes
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95 starting at BUFFER.
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96 It is necessary that LEN is a multiple of 64!!! */
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97 extern void sha1_process_block (const void *buffer, size_t len,
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98 struct sha1_ctx *ctx);
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99
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100 /* Starting with the result of former calls of this function (or the
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101 initialization function update the context for the next LEN bytes
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102 starting at BUFFER.
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103 It is NOT required that LEN is a multiple of 64. */
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104 extern void sha1_process_bytes (const void *buffer, size_t len,
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105 struct sha1_ctx *ctx);
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106
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107 /* Process the remaining bytes in the buffer and put result from CTX
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108 in first 20 bytes following RESBUF. The result is always in little
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109 endian byte order, so that a byte-wise output yields to the wanted
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110 ASCII representation of the message digest.
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111
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112 IMPORTANT: On some systems it is required that RESBUF be correctly
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113 aligned for a 32 bits value. */
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114 extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf);
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115
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116
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117 /* Put result from CTX in first 20 bytes following RESBUF. The result is
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118 always in little endian byte order, so that a byte-wise output yields
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119 to the wanted ASCII representation of the message digest.
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120
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121 IMPORTANT: On some systems it is required that RESBUF is correctly
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122 aligned for a 32 bits value. */
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123 extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf);
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124
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125
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126 /* Compute SHA1 message digest for bytes read from STREAM. The
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127 resulting message digest number will be written into the 20 bytes
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128 beginning at RESBLOCK. */
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129 extern int sha1_stream (FILE *stream, void *resblock);
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130
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131 /* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The
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132 result is always in little endian byte order, so that a byte-wise
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133 output yields to the wanted ASCII representation of the message
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134 digest. */
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135 extern void *sha1_buffer (const char *buffer, size_t len, void *resblock);
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136
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137 #ifdef __cplusplus
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138 }
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139 #endif
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140
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141 #endif
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