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1/* Declarations of functions and data types used for SHA1 sum
2 library functions.
6a1cde4d 3 Copyright (C) 2000, 2001, 2003, 2005, 2006, 2008
9f9a7d03 4 Free Software Foundation, Inc.
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5
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
6a1cde4d 8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
19
20#ifndef SHA1_H
21# define SHA1_H 1
22
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23#include <stdio.h>
24
25#if defined HAVE_LIMITS_H || _LIBC
26# include <limits.h>
27#endif
28
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29/* The following contortions are an attempt to use the C preprocessor
30 to determine an unsigned integral type that is 32 bits wide. An
31 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
32 doing that would require that the configure script compile and *run*
33 the resulting executable. Locally running cross-compiled executables
34 is usually not possible. */
35
36#ifdef _LIBC
37# include <sys/types.h>
38typedef u_int32_t sha1_uint32;
39typedef uintptr_t sha1_uintptr;
40#else
41# define INT_MAX_32_BITS 2147483647
42
43/* If UINT_MAX isn't defined, assume it's a 32-bit type.
44 This should be valid for all systems GNU cares about because
45 that doesn't include 16-bit systems, and only modern systems
46 (that certainly have <limits.h>) have 64+-bit integral types. */
47
48# ifndef INT_MAX
49# define INT_MAX INT_MAX_32_BITS
50# endif
51
52# if INT_MAX == INT_MAX_32_BITS
53 typedef unsigned int sha1_uint32;
54# else
55# if SHRT_MAX == INT_MAX_32_BITS
56 typedef unsigned short sha1_uint32;
57# else
58# if LONG_MAX == INT_MAX_32_BITS
59 typedef unsigned long sha1_uint32;
60# else
61 /* The following line is intended to evoke an error.
62 Using #error is not portable enough. */
63 "Cannot determine unsigned 32-bit data type."
64# endif
65# endif
66# endif
67#endif
68
69#ifdef __cplusplus
70extern "C" {
71#endif
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72
73/* Structure to save state of computation between the single steps. */
74struct sha1_ctx
75{
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76 sha1_uint32 A;
77 sha1_uint32 B;
78 sha1_uint32 C;
79 sha1_uint32 D;
80 sha1_uint32 E;
81
82 sha1_uint32 total[2];
83 sha1_uint32 buflen;
84 sha1_uint32 buffer[32];
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85};
86
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87/* Initialize structure containing state of computation. */
88extern void sha1_init_ctx (struct sha1_ctx *ctx);
89
90/* Starting with the result of former calls of this function (or the
91 initialization function update the context for the next LEN bytes
92 starting at BUFFER.
93 It is necessary that LEN is a multiple of 64!!! */
94extern void sha1_process_block (const void *buffer, size_t len,
95 struct sha1_ctx *ctx);
96
97/* Starting with the result of former calls of this function (or the
98 initialization function update the context for the next LEN bytes
99 starting at BUFFER.
100 It is NOT required that LEN is a multiple of 64. */
101extern void sha1_process_bytes (const void *buffer, size_t len,
102 struct sha1_ctx *ctx);
103
104/* Process the remaining bytes in the buffer and put result from CTX
105 in first 20 bytes following RESBUF. The result is always in little
106 endian byte order, so that a byte-wise output yields to the wanted
107 ASCII representation of the message digest.
108
109 IMPORTANT: On some systems it is required that RESBUF be correctly
110 aligned for a 32 bits value. */
111extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf);
112
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113/* Put result from CTX in first 20 bytes following RESBUF. The result is
114 always in little endian byte order, so that a byte-wise output yields
115 to the wanted ASCII representation of the message digest.
116
117 IMPORTANT: On some systems it is required that RESBUF is correctly
118 aligned for a 32 bits value. */
119extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf);
120
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121/* Compute SHA1 message digest for bytes read from STREAM. The
122 resulting message digest number will be written into the 20 bytes
123 beginning at RESBLOCK. */
124extern int sha1_stream (FILE *stream, void *resblock);
125
126/* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The
127 result is always in little endian byte order, so that a byte-wise
128 output yields to the wanted ASCII representation of the message
129 digest. */
130extern void *sha1_buffer (const char *buffer, size_t len, void *resblock);
131
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132#ifdef __cplusplus
133}
134#endif
135
05697ec1 136#endif