1 /* Declaration of functions and data types used for MD5 sum computing 2 library functions. 3 Copyright (C) 1995-1997, 1999-2001, 2004-2006, 2008-2020 Free Software 4 Foundation, Inc. 5 This file is part of the GNU C Library. 6 7 This program is free software; you can redistribute it and/or modify it 8 under the terms of the GNU Lesser General Public License as published by the 9 Free Software Foundation; either version 2.1, or (at your option) any 10 later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU Lesser General Public License for more details. 16 17 You should have received a copy of the GNU Lesser General Public License 18 along with this program; if not, see <https://www.gnu.org/licenses/>. */ 19 20 #ifndef _MD5_H 21 #define _MD5_H 1 22 23 #include <stdio.h> 24 #include <stdint.h> 25 26 # if HAVE_OPENSSL_MD5 27 # include <openssl/md5.h> 28 # endif 29 30 #define MD5_DIGEST_SIZE 16 31 #define MD5_BLOCK_SIZE 64 32 33 #ifndef __GNUC_PREREQ 34 # if defined __GNUC__ && defined __GNUC_MINOR__ 35 # define __GNUC_PREREQ(maj, min) \ 36 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) 37 # else 38 # define __GNUC_PREREQ(maj, min) 0 39 # endif 40 #endif 41 42 #ifndef __THROW 43 # if defined __cplusplus && (__GNUC_PREREQ (2,8) || __clang_major__ >= 4) 44 # define __THROW throw () 45 # else 46 # define __THROW 47 # endif 48 #endif 49 50 #ifndef _LIBC 51 # define __md5_buffer md5_buffer 52 # define __md5_finish_ctx md5_finish_ctx 53 # define __md5_init_ctx md5_init_ctx 54 # define __md5_process_block md5_process_block 55 # define __md5_process_bytes md5_process_bytes 56 # define __md5_read_ctx md5_read_ctx 57 # define __md5_stream md5_stream 58 #endif 59 60 # ifdef __cplusplus 61 extern "C" { 62 # endif 63 64 # if HAVE_OPENSSL_MD5 65 # define GL_OPENSSL_NAME 5 66 # include "gl_openssl.h" 67 # else 68 /* Structure to save state of computation between the single steps. */ 69 struct md5_ctx 70 { 71 uint32_t A; 72 uint32_t B; 73 uint32_t C; 74 uint32_t D; 75 76 uint32_t total[2]; 77 uint32_t buflen; /* ≥ 0, ≤ 128 */ 78 uint32_t buffer[32]; /* 128 bytes; the first buflen bytes are in use */ 79 }; 80 81 /* 82 * The following three functions are build up the low level used in 83 * the functions 'md5_stream' and 'md5_buffer'. 84 */ 85 86 /* Initialize structure containing state of computation. 87 (RFC 1321, 3.3: Step 3) */ 88 extern void __md5_init_ctx (struct md5_ctx *ctx) __THROW; 89 90 /* Starting with the result of former calls of this function (or the 91 initialization function update the context for the next LEN bytes 92 starting at BUFFER. 93 It is necessary that LEN is a multiple of 64!!! */ 94 extern void __md5_process_block (const void *buffer, size_t len, 95 struct md5_ctx *ctx) __THROW; 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 NOT required that LEN is a multiple of 64. */ 101 extern void __md5_process_bytes (const void *buffer, size_t len, 102 struct md5_ctx *ctx) __THROW; 103 104 /* Process the remaining bytes in the buffer and put result from CTX 105 in first 16 bytes following RESBUF. The result is always in little 106 endian byte order, so that a byte-wise output yields to the wanted 107 ASCII representation of the message digest. */ 108 extern void *__md5_finish_ctx (struct md5_ctx *ctx, void *restrict resbuf) 109 __THROW; 110 111 112 /* Put result from CTX in first 16 bytes following RESBUF. The result is 113 always in little endian byte order, so that a byte-wise output yields 114 to the wanted ASCII representation of the message digest. */ 115 extern void *__md5_read_ctx (const struct md5_ctx *ctx, void *restrict resbuf) 116 __THROW; 117 118 119 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The 120 result is always in little endian byte order, so that a byte-wise 121 output yields to the wanted ASCII representation of the message 122 digest. */ 123 extern void *__md5_buffer (const char *buffer, size_t len, 124 void *restrict resblock) __THROW; 125 126 # endif 127 /* Compute MD5 message digest for bytes read from STREAM. 128 STREAM is an open file stream. Regular files are handled more efficiently. 129 The contents of STREAM from its current position to its end will be read. 130 The case that the last operation on STREAM was an 'ungetc' is not supported. 131 The resulting message digest number will be written into the 16 bytes 132 beginning at RESBLOCK. */ 133 extern int __md5_stream (FILE *stream, void *resblock) __THROW; 134 135 136 # ifdef __cplusplus 137 } 138 # endif 139 140 #endif /* md5.h */ 141 142 /* 143 * Hey Emacs! 144 * Local Variables: 145 * coding: utf-8 146 * End: 147 */