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1 | /* Declarations of functions and data types used for SHA1 sum |
2 | library functions. | |
fd67aa11 | 3 | Copyright (C) 2000-2024 Free Software Foundation, Inc. |
b68965a0 DD |
4 | |
5 | This program is free software; you can redistribute it and/or modify it | |
6 | under the terms of the GNU General Public License as published by the | |
e4e42b45 | 7 | Free Software Foundation; either version 3, or (at your option) any |
b68965a0 DD |
8 | later version. |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software Foundation, | |
17 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | |
18 | ||
19 | #ifndef SHA1_H | |
20 | # define SHA1_H 1 | |
21 | ||
22 | #include <stdio.h> | |
23 | ||
24 | #if defined HAVE_LIMITS_H || _LIBC | |
25 | # include <limits.h> | |
26 | #endif | |
27 | ||
28 | #include "ansidecl.h" | |
29 | ||
30 | /* The following contortions are an attempt to use the C preprocessor | |
31 | to determine an unsigned integral type that is 32 bits wide. An | |
32 | alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but | |
33 | doing that would require that the configure script compile and *run* | |
34 | the resulting executable. Locally running cross-compiled executables | |
35 | is usually not possible. */ | |
36 | ||
37 | #ifdef _LIBC | |
38 | # include <sys/types.h> | |
39 | typedef u_int32_t sha1_uint32; | |
40 | typedef uintptr_t sha1_uintptr; | |
e5e04ca3 KT |
41 | #elif defined (HAVE_SYS_TYPES_H) && defined (HAVE_STDINT_H) |
42 | #include <stdint.h> | |
43 | #include <sys/types.h> | |
44 | typedef uint32_t sha1_uint32; | |
45 | typedef uintptr_t sha1_uintptr; | |
b68965a0 DD |
46 | #else |
47 | # define INT_MAX_32_BITS 2147483647 | |
48 | ||
49 | /* If UINT_MAX isn't defined, assume it's a 32-bit type. | |
50 | This should be valid for all systems GNU cares about because | |
51 | that doesn't include 16-bit systems, and only modern systems | |
52 | (that certainly have <limits.h>) have 64+-bit integral types. */ | |
53 | ||
54 | # ifndef INT_MAX | |
55 | # define INT_MAX INT_MAX_32_BITS | |
56 | # endif | |
57 | ||
58 | # if INT_MAX == INT_MAX_32_BITS | |
59 | typedef unsigned int sha1_uint32; | |
60 | # else | |
61 | # if SHRT_MAX == INT_MAX_32_BITS | |
62 | typedef unsigned short sha1_uint32; | |
63 | # else | |
64 | # if LONG_MAX == INT_MAX_32_BITS | |
65 | typedef unsigned long sha1_uint32; | |
66 | # else | |
67 | /* The following line is intended to evoke an error. | |
68 | Using #error is not portable enough. */ | |
69 | "Cannot determine unsigned 32-bit data type." | |
70 | # endif | |
71 | # endif | |
72 | # endif | |
73 | #endif | |
74 | ||
75 | #ifdef __cplusplus | |
76 | extern "C" { | |
77 | #endif | |
78 | ||
79 | /* Structure to save state of computation between the single steps. */ | |
80 | struct sha1_ctx | |
81 | { | |
82 | sha1_uint32 A; | |
83 | sha1_uint32 B; | |
84 | sha1_uint32 C; | |
85 | sha1_uint32 D; | |
86 | sha1_uint32 E; | |
87 | ||
88 | sha1_uint32 total[2]; | |
89 | sha1_uint32 buflen; | |
90 | sha1_uint32 buffer[32]; | |
91 | }; | |
92 | ||
93 | ||
94 | /* Initialize structure containing state of computation. */ | |
95 | extern void sha1_init_ctx (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 necessary that LEN is a multiple of 64!!! */ | |
101 | extern void sha1_process_block (const void *buffer, size_t len, | |
102 | struct sha1_ctx *ctx); | |
103 | ||
104 | /* Starting with the result of former calls of this function (or the | |
105 | initialization function update the context for the next LEN bytes | |
106 | starting at BUFFER. | |
107 | It is NOT required that LEN is a multiple of 64. */ | |
108 | extern void sha1_process_bytes (const void *buffer, size_t len, | |
109 | struct sha1_ctx *ctx); | |
110 | ||
4a50820e JJ |
111 | typedef void (*sha1_process_bytes_fn) (const void *, size_t, |
112 | struct sha1_ctx *); | |
113 | ||
114 | /* Return sha1_process_bytes or some hardware optimized version thereof | |
115 | depending on current CPU. */ | |
116 | extern sha1_process_bytes_fn sha1_choose_process_bytes (void); | |
117 | ||
b68965a0 DD |
118 | /* Process the remaining bytes in the buffer and put result from CTX |
119 | in first 20 bytes following RESBUF. The result is always in little | |
120 | endian byte order, so that a byte-wise output yields to the wanted | |
121 | ASCII representation of the message digest. | |
122 | ||
123 | IMPORTANT: On some systems it is required that RESBUF be correctly | |
124 | aligned for a 32 bits value. */ | |
125 | extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf); | |
126 | ||
127 | ||
128 | /* Put result from CTX in first 20 bytes following RESBUF. The result is | |
129 | always in little endian byte order, so that a byte-wise output yields | |
130 | to the wanted ASCII representation of the message digest. | |
131 | ||
132 | IMPORTANT: On some systems it is required that RESBUF is correctly | |
133 | aligned for a 32 bits value. */ | |
134 | extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf); | |
135 | ||
136 | ||
137 | /* Compute SHA1 message digest for bytes read from STREAM. The | |
138 | resulting message digest number will be written into the 20 bytes | |
139 | beginning at RESBLOCK. */ | |
140 | extern int sha1_stream (FILE *stream, void *resblock); | |
141 | ||
142 | /* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The | |
143 | result is always in little endian byte order, so that a byte-wise | |
144 | output yields to the wanted ASCII representation of the message | |
145 | digest. */ | |
146 | extern void *sha1_buffer (const char *buffer, size_t len, void *resblock); | |
147 | ||
148 | #ifdef __cplusplus | |
149 | } | |
150 | #endif | |
151 | ||
152 | #endif |