1 /* Declaration of functions and data types used for SHA1 sum computing 2 library functions. 3 Copyright (C) 2008 Red Hat, Inc. 4 This file is part of elfutils. 5 Written by Ulrich Drepper <drepper (at) redhat.com>, 2008. 6 7 This file is free software; you can redistribute it and/or modify 8 it under the terms of either 9 10 * the GNU Lesser General Public License as published by the Free 11 Software Foundation; either version 3 of the License, or (at 12 your option) any later version 13 14 or 15 16 * the GNU General Public License as published by the Free 17 Software Foundation; either version 2 of the License, or (at 18 your option) any later version 19 20 or both in parallel, as here. 21 22 elfutils is distributed in the hope that it will be useful, but 23 WITHOUT ANY WARRANTY; without even the implied warranty of 24 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 25 General Public License for more details. 26 27 You should have received copies of the GNU General Public License and 28 the GNU Lesser General Public License along with this program. If 29 not, see <http://www.gnu.org/licenses/>. */ 30 31 #ifndef _SHA1_H 32 #define _SHA1_H 1 33 34 #include <limits.h> 35 #include <stdint.h> 36 #include <stdio.h> 37 38 #define SHA1_DIGEST_SIZE 20 39 #define SHA1_BLOCK_SIZE 64 40 41 typedef uint32_t sha1_uint32; 42 typedef uintptr_t sha1_uintptr; 43 44 /* Structure to save state of computation between the single steps. */ 45 struct sha1_ctx 46 { 47 sha1_uint32 A; 48 sha1_uint32 B; 49 sha1_uint32 C; 50 sha1_uint32 D; 51 sha1_uint32 E; 52 53 sha1_uint32 total[2]; 54 sha1_uint32 buflen; 55 char buffer[128] __attribute__ ((__aligned__ (__alignof__ (sha1_uint32)))); 56 }; 57 58 /* Initialize structure containing state of computation. */ 59 extern void sha1_init_ctx (struct sha1_ctx *ctx); 60 61 /* Starting with the result of former calls of this function (or the 62 initialization function update the context for the next LEN bytes 63 starting at BUFFER. 64 It is necessary that LEN is a multiple of 64!!! */ 65 extern void sha1_process_block (const void *buffer, size_t len, 66 struct sha1_ctx *ctx); 67 68 /* Starting with the result of former calls of this function (or the 69 initialization function update the context for the next LEN bytes 70 starting at BUFFER. 71 It is NOT required that LEN is a multiple of 64. */ 72 extern void sha1_process_bytes (const void *buffer, size_t len, 73 struct sha1_ctx *ctx); 74 75 /* Process the remaining bytes in the buffer and put result from CTX 76 in first 20 bytes following RESBUF. The result is always in little 77 endian byte order, so that a byte-wise output yields to the wanted 78 ASCII representation of the message digest. 79 80 IMPORTANT: On some systems it is required that RESBUF is correctly 81 aligned for a 32 bits value. */ 82 extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf); 83 84 85 /* Put result from CTX in first 20 bytes following RESBUF. The result is 86 always in little endian byte order, so that a byte-wise output yields 87 to the wanted ASCII representation of the message digest. 88 89 IMPORTANT: On some systems it is required that RESBUF is correctly 90 aligned for a 32 bits value. */ 91 extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf); 92 93 #endif /* sha1.h */ 94
