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 Red Hat elfutils. 5 Written by Ulrich Drepper <drepper (at) redhat.com>, 2008. 6 7 Red Hat elfutils is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by the 9 Free Software Foundation; version 2 of the License. 10 11 Red Hat elfutils is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License along 17 with Red Hat elfutils; if not, write to the Free Software Foundation, 18 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 19 20 Red Hat elfutils is an included package of the Open Invention Network. 21 An included package of the Open Invention Network is a package for which 22 Open Invention Network licensees cross-license their patents. No patent 23 license is granted, either expressly or impliedly, by designation as an 24 included package. Should you wish to participate in the Open Invention 25 Network licensing program, please visit www.openinventionnetwork.com 26 <http://www.openinventionnetwork.com>. */ 27 28 #ifndef _SHA1_H 29 #define _SHA1_H 1 30 31 #include <limits.h> 32 #include <stdint.h> 33 #include <stdio.h> 34 35 #define SHA1_DIGEST_SIZE 20 36 #define SHA1_BLOCK_SIZE 64 37 38 typedef uint32_t sha1_uint32; 39 typedef uintptr_t sha1_uintptr; 40 41 /* Structure to save state of computation between the single steps. */ 42 struct sha1_ctx 43 { 44 sha1_uint32 A; 45 sha1_uint32 B; 46 sha1_uint32 C; 47 sha1_uint32 D; 48 sha1_uint32 E; 49 50 sha1_uint32 total[2]; 51 sha1_uint32 buflen; 52 char buffer[128] __attribute__ ((__aligned__ (__alignof__ (sha1_uint32)))); 53 }; 54 55 /* Initialize structure containing state of computation. */ 56 extern void sha1_init_ctx (struct sha1_ctx *ctx); 57 58 /* Starting with the result of former calls of this function (or the 59 initialization function update the context for the next LEN bytes 60 starting at BUFFER. 61 It is necessary that LEN is a multiple of 64!!! */ 62 extern void sha1_process_block (const void *buffer, size_t len, 63 struct sha1_ctx *ctx); 64 65 /* Starting with the result of former calls of this function (or the 66 initialization function update the context for the next LEN bytes 67 starting at BUFFER. 68 It is NOT required that LEN is a multiple of 64. */ 69 extern void sha1_process_bytes (const void *buffer, size_t len, 70 struct sha1_ctx *ctx); 71 72 /* Process the remaining bytes in the buffer and put result from CTX 73 in first 20 bytes following RESBUF. The result is always in little 74 endian byte order, so that a byte-wise output yields to the wanted 75 ASCII representation of the message digest. 76 77 IMPORTANT: On some systems it is required that RESBUF is correctly 78 aligned for a 32 bits value. */ 79 extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf); 80 81 82 /* Put result from CTX in first 20 bytes following RESBUF. The result is 83 always in little endian byte order, so that a byte-wise output yields 84 to the wanted ASCII representation of the message digest. 85 86 IMPORTANT: On some systems it is required that RESBUF is correctly 87 aligned for a 32 bits value. */ 88 extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf); 89 90 #endif /* sha1.h */ 91
