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05697ec1 NB |
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. |
05697ec1 NB |
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 |
05697ec1 NB |
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 | ||
9f9a7d03 N |
23 | #include <stdio.h> |
24 | ||
25 | #if defined HAVE_LIMITS_H || _LIBC | |
26 | # include <limits.h> | |
27 | #endif | |
28 | ||
9f9a7d03 N |
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> | |
38 | typedef u_int32_t sha1_uint32; | |
39 | typedef 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 | |
70 | extern "C" { | |
71 | #endif | |
05697ec1 NB |
72 | |
73 | /* Structure to save state of computation between the single steps. */ | |
74 | struct sha1_ctx | |
75 | { | |
9f9a7d03 N |
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]; | |
05697ec1 NB |
85 | }; |
86 | ||
05697ec1 NB |
87 | /* Initialize structure containing state of computation. */ |
88 | extern 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!!! */ | |
94 | extern 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. */ | |
101 | extern 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. */ | |
111 | extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf); | |
112 | ||
05697ec1 NB |
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. */ | |
119 | extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf); | |
120 | ||
05697ec1 NB |
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. */ | |
124 | extern 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. */ | |
130 | extern void *sha1_buffer (const char *buffer, size_t len, void *resblock); | |
131 | ||
9f9a7d03 N |
132 | #ifdef __cplusplus |
133 | } | |
134 | #endif | |
135 | ||
05697ec1 | 136 | #endif |