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[binutils.git] / include / sha1.h
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1 /* Declarations of functions and data types used for SHA1 sum
2 library functions.
3 Copyright (C) 2000, 2001, 2003, 2005, 2006, 2008
4 Free Software Foundation, Inc.
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
8 Free Software Foundation; either version 2, or (at your option) any
9 later version.
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.
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. */
20 #ifndef SHA1_H
21 # define SHA1_H 1
23 #include <stdio.h>
25 #if defined HAVE_LIMITS_H || _LIBC
26 # include <limits.h>
27 #endif
29 #include "ansidecl.h"
31 /* The following contortions are an attempt to use the C preprocessor
32 to determine an unsigned integral type that is 32 bits wide. An
33 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
34 doing that would require that the configure script compile and *run*
35 the resulting executable. Locally running cross-compiled executables
36 is usually not possible. */
38 #ifdef _LIBC
39 # include <sys/types.h>
40 typedef u_int32_t sha1_uint32;
41 typedef uintptr_t sha1_uintptr;
42 #else
43 # define INT_MAX_32_BITS 2147483647
45 /* If UINT_MAX isn't defined, assume it's a 32-bit type.
46 This should be valid for all systems GNU cares about because
47 that doesn't include 16-bit systems, and only modern systems
48 (that certainly have <limits.h>) have 64+-bit integral types. */
50 # ifndef INT_MAX
51 # define INT_MAX INT_MAX_32_BITS
52 # endif
54 # if INT_MAX == INT_MAX_32_BITS
55 typedef unsigned int sha1_uint32;
56 # else
57 # if SHRT_MAX == INT_MAX_32_BITS
58 typedef unsigned short sha1_uint32;
59 # else
60 # if LONG_MAX == INT_MAX_32_BITS
61 typedef unsigned long sha1_uint32;
62 # else
63 /* The following line is intended to evoke an error.
64 Using #error is not portable enough. */
65 "Cannot determine unsigned 32-bit data type."
66 # endif
67 # endif
68 # endif
69 #endif
71 #ifdef __cplusplus
72 extern "C" {
73 #endif
75 /* Structure to save state of computation between the single steps. */
76 struct sha1_ctx
78 sha1_uint32 A;
79 sha1_uint32 B;
80 sha1_uint32 C;
81 sha1_uint32 D;
82 sha1_uint32 E;
84 sha1_uint32 total[2];
85 sha1_uint32 buflen;
86 sha1_uint32 buffer[32];
90 /* Initialize structure containing state of computation. */
91 extern void sha1_init_ctx (struct sha1_ctx *ctx);
93 /* Starting with the result of former calls of this function (or the
94 initialization function update the context for the next LEN bytes
95 starting at BUFFER.
96 It is necessary that LEN is a multiple of 64!!! */
97 extern void sha1_process_block (const void *buffer, size_t len,
98 struct sha1_ctx *ctx);
100 /* Starting with the result of former calls of this function (or the
101 initialization function update the context for the next LEN bytes
102 starting at BUFFER.
103 It is NOT required that LEN is a multiple of 64. */
104 extern void sha1_process_bytes (const void *buffer, size_t len,
105 struct sha1_ctx *ctx);
107 /* Process the remaining bytes in the buffer and put result from CTX
108 in first 20 bytes following RESBUF. The result is always in little
109 endian byte order, so that a byte-wise output yields to the wanted
110 ASCII representation of the message digest.
112 IMPORTANT: On some systems it is required that RESBUF be correctly
113 aligned for a 32 bits value. */
114 extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf);
117 /* Put result from CTX in first 20 bytes following RESBUF. The result is
118 always in little endian byte order, so that a byte-wise output yields
119 to the wanted ASCII representation of the message digest.
121 IMPORTANT: On some systems it is required that RESBUF is correctly
122 aligned for a 32 bits value. */
123 extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf);
126 /* Compute SHA1 message digest for bytes read from STREAM. The
127 resulting message digest number will be written into the 20 bytes
128 beginning at RESBLOCK. */
129 extern int sha1_stream (FILE *stream, void *resblock);
131 /* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The
132 result is always in little endian byte order, so that a byte-wise
133 output yields to the wanted ASCII representation of the message
134 digest. */
135 extern void *sha1_buffer (const char *buffer, size_t len, void *resblock);
137 #ifdef __cplusplus
139 #endif
141 #endif