1 /* Declarations of functions and data types used for SHA1 sum 2 library functions. 3 Copyright (C) 2000-2001, 2003, 2005-2006, 2008-2021 Free Software 4 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, see <https://www.gnu.org/licenses/>. */ 18 19 #ifndef SHA1_H 20 # define SHA1_H 1 21 22 # include <stdio.h> 23 # include <stdint.h> 24 25 # if HAVE_OPENSSL_SHA1 26 # include <openssl/sha.h> 27 # endif 28 29 # ifdef __cplusplus 30 extern "C" { 31 # endif 32 33 #define SHA1_DIGEST_SIZE 20 34 35 # if HAVE_OPENSSL_SHA1 36 # define GL_OPENSSL_NAME 1 37 # include "gl_openssl.h" 38 # else 39 /* Structure to save state of computation between the single steps. */ 40 struct sha1_ctx 41 { 42 uint32_t A; 43 uint32_t B; 44 uint32_t C; 45 uint32_t D; 46 uint32_t E; 47 48 uint32_t total[2]; 49 uint32_t buflen; /* ≥ 0, ≤ 128 */ 50 uint32_t buffer[32]; /* 128 bytes; the first buflen bytes are in use */ 51 }; 52 53 /* Initialize structure containing state of computation. */ 54 extern void sha1_init_ctx (struct sha1_ctx *ctx); 55 56 /* Starting with the result of former calls of this function (or the 57 initialization function update the context for the next LEN bytes 58 starting at BUFFER. 59 It is necessary that LEN is a multiple of 64!!! */ 60 extern void sha1_process_block (const void *buffer, size_t len, 61 struct sha1_ctx *ctx); 62 63 /* Starting with the result of former calls of this function (or the 64 initialization function update the context for the next LEN bytes 65 starting at BUFFER. 66 It is NOT required that LEN is a multiple of 64. */ 67 extern void sha1_process_bytes (const void *buffer, size_t len, 68 struct sha1_ctx *ctx); 69 70 /* Process the remaining bytes in the buffer and put result from CTX 71 in first 20 bytes following RESBUF. The result is always in little 72 endian byte order, so that a byte-wise output yields to the wanted 73 ASCII representation of the message digest. */ 74 extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *restrict resbuf); 75 76 77 /* Put result from CTX in first 20 bytes following RESBUF. The result is 78 always in little endian byte order, so that a byte-wise output yields 79 to the wanted ASCII representation of the message digest. */ 80 extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *restrict resbuf); 81 82 83 /* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The 84 result is always in little endian byte order, so that a byte-wise 85 output yields to the wanted ASCII representation of the message 86 digest. */ 87 extern void *sha1_buffer (const char *buffer, size_t len, 88 void *restrict resblock); 89 90 # endif 91 /* Compute SHA1 message digest for bytes read from STREAM. 92 STREAM is an open file stream. Regular files are handled more efficiently. 93 The contents of STREAM from its current position to its end will be read. 94 The case that the last operation on STREAM was an 'ungetc' is not supported. 95 The resulting message digest number will be written into the 20 bytes 96 beginning at RESBLOCK. */ 97 extern int sha1_stream (FILE *stream, void *resblock); 98 99 100 # ifdef __cplusplus 101 } 102 # endif 103 104 #endif 105 106 /* 107 * Hey Emacs! 108 * Local Variables: 109 * coding: utf-8 110 * End: 111 */ 112