gcc/
[official-gcc.git] / include / sha1.h
blob4da5c37f38674a392dbe84627a6c2908ec851ae6
1 /* Declarations of functions and data types used for SHA1 sum
2 library functions.
3 Copyright (C) 2000, 2001, 2003, 2005, 2006, 2008, 2010
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 3, 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 #elif defined (HAVE_SYS_TYPES_H) && defined (HAVE_STDINT_H)
43 #include <stdint.h>
44 #include <sys/types.h>
45 typedef uint32_t sha1_uint32;
46 typedef uintptr_t sha1_uintptr;
47 #else
48 # define INT_MAX_32_BITS 2147483647
50 /* If UINT_MAX isn't defined, assume it's a 32-bit type.
51 This should be valid for all systems GNU cares about because
52 that doesn't include 16-bit systems, and only modern systems
53 (that certainly have <limits.h>) have 64+-bit integral types. */
55 # ifndef INT_MAX
56 # define INT_MAX INT_MAX_32_BITS
57 # endif
59 # if INT_MAX == INT_MAX_32_BITS
60 typedef unsigned int sha1_uint32;
61 # else
62 # if SHRT_MAX == INT_MAX_32_BITS
63 typedef unsigned short sha1_uint32;
64 # else
65 # if LONG_MAX == INT_MAX_32_BITS
66 typedef unsigned long sha1_uint32;
67 # else
68 /* The following line is intended to evoke an error.
69 Using #error is not portable enough. */
70 "Cannot determine unsigned 32-bit data type."
71 # endif
72 # endif
73 # endif
74 #endif
76 #ifdef __cplusplus
77 extern "C" {
78 #endif
80 /* Structure to save state of computation between the single steps. */
81 struct sha1_ctx
83 sha1_uint32 A;
84 sha1_uint32 B;
85 sha1_uint32 C;
86 sha1_uint32 D;
87 sha1_uint32 E;
89 sha1_uint32 total[2];
90 sha1_uint32 buflen;
91 sha1_uint32 buffer[32];
95 /* Initialize structure containing state of computation. */
96 extern void sha1_init_ctx (struct sha1_ctx *ctx);
98 /* Starting with the result of former calls of this function (or the
99 initialization function update the context for the next LEN bytes
100 starting at BUFFER.
101 It is necessary that LEN is a multiple of 64!!! */
102 extern void sha1_process_block (const void *buffer, size_t len,
103 struct sha1_ctx *ctx);
105 /* Starting with the result of former calls of this function (or the
106 initialization function update the context for the next LEN bytes
107 starting at BUFFER.
108 It is NOT required that LEN is a multiple of 64. */
109 extern void sha1_process_bytes (const void *buffer, size_t len,
110 struct sha1_ctx *ctx);
112 /* Process the remaining bytes in the buffer and put result from CTX
113 in first 20 bytes following RESBUF. The result is always in little
114 endian byte order, so that a byte-wise output yields to the wanted
115 ASCII representation of the message digest.
117 IMPORTANT: On some systems it is required that RESBUF be correctly
118 aligned for a 32 bits value. */
119 extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf);
122 /* Put result from CTX in first 20 bytes following RESBUF. The result is
123 always in little endian byte order, so that a byte-wise output yields
124 to the wanted ASCII representation of the message digest.
126 IMPORTANT: On some systems it is required that RESBUF is correctly
127 aligned for a 32 bits value. */
128 extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf);
131 /* Compute SHA1 message digest for bytes read from STREAM. The
132 resulting message digest number will be written into the 20 bytes
133 beginning at RESBLOCK. */
134 extern int sha1_stream (FILE *stream, void *resblock);
136 /* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The
137 result is always in little endian byte order, so that a byte-wise
138 output yields to the wanted ASCII representation of the message
139 digest. */
140 extern void *sha1_buffer (const char *buffer, size_t len, void *resblock);
142 #ifdef __cplusplus
144 #endif
146 #endif