1 /* Declarations of functions and data types used for SHA1 sum 2 library functions. 3 Copyright (C) 2000-2016 Free Software Foundation, Inc. 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 7 Free Software Foundation; either version 3, or (at your option) any 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; 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; 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); 110 111 /* Process the remaining bytes in the buffer and put result from CTX 112 in first 20 bytes following RESBUF. The result is always in little 113 endian byte order, so that a byte-wise output yields to the wanted 114 ASCII representation of the message digest. 115 116 IMPORTANT: On some systems it is required that RESBUF be correctly 117 aligned for a 32 bits value. */ 118 extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf); 119 120 121 /* Put result from CTX in first 20 bytes following RESBUF. The result is 122 always in little endian byte order, so that a byte-wise output yields 123 to the wanted ASCII representation of the message digest. 124 125 IMPORTANT: On some systems it is required that RESBUF is correctly 126 aligned for a 32 bits value. */ 127 extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf); 128 129 130 /* Compute SHA1 message digest for bytes read from STREAM. The 131 resulting message digest number will be written into the 20 bytes 132 beginning at RESBLOCK. */ 133 extern int sha1_stream (FILE *stream, void *resblock); 134 135 /* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The 136 result is always in little endian byte order, so that a byte-wise 137 output yields to the wanted ASCII representation of the message 138 digest. */ 139 extern void *sha1_buffer (const char *buffer, size_t len, void *resblock); 140 141 #ifdef __cplusplus 142 } 143 #endif 144 145 #endif 146
