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. 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 8 Free Software Foundation; either version 3, or (at your option) any 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 23 #include <stdio.h> 24 25 #if defined HAVE_LIMITS_H || _LIBC 26 # include <limits.h> 27 #endif 28 29 #include "ansidecl.h" 30 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. */ 37 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 44 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. */ 49 50 # ifndef INT_MAX 51 # define INT_MAX INT_MAX_32_BITS 52 # endif 53 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 70 71 #ifdef __cplusplus 72 extern "C" { 73 #endif 74 75 /* Structure to save state of computation between the single steps. */ 76 struct sha1_ctx 77 { 78 sha1_uint32 A; 79 sha1_uint32 B; 80 sha1_uint32 C; 81 sha1_uint32 D; 82 sha1_uint32 E; 83 84 sha1_uint32 total[2]; 85 sha1_uint32 buflen; 86 sha1_uint32 buffer[32]; 87 }; 88 89 90 /* Initialize structure containing state of computation. */ 91 extern void sha1_init_ctx (struct sha1_ctx *ctx); 92 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); 99 100 /* 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); 106 107 /* 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. 111 112 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); 115 116 117 /* 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. 120 121 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); 124 125 126 /* 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); 130 131 /* 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); 136 137 #ifdef __cplusplus 138 } 139 #endif 140 141 #endif 142