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 #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 49 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. */ 54 55 # ifndef INT_MAX 56 # define INT_MAX INT_MAX_32_BITS 57 # endif 58 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 75 76 #ifdef __cplusplus 77 extern "C" { 78 #endif 79 80 /* Structure to save state of computation between the single steps. */ 81 struct sha1_ctx 82 { 83 sha1_uint32 A; 84 sha1_uint32 B; 85 sha1_uint32 C; 86 sha1_uint32 D; 87 sha1_uint32 E; 88 89 sha1_uint32 total[2]; 90 sha1_uint32 buflen; 91 sha1_uint32 buffer[32]; 92 }; 93 94 95 /* Initialize structure containing state of computation. */ 96 extern void sha1_init_ctx (struct sha1_ctx *ctx); 97 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); 104 105 /* 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); 111 112 /* 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. 116 117 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); 120 121 122 /* 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. 125 126 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); 129 130 131 /* 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); 135 136 /* 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); 141 142 #ifdef __cplusplus 143 } 144 #endif 145 146 #endif 147