sha1.h (3223B)
1 /* Declarations of functions and data types used for SHA1 sum 2 library functions. 3 Copyright (C) 2000, 2001, 2003 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 2, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 18 19 #ifndef SHA1_H 20 # define SHA1_H 1 21 22 # include <stdio.h> 23 # include <stdint.h> 24 25 /* Structure to save state of computation between the single steps. */ 26 struct sha_ctx 27 { 28 uint32_t A; 29 uint32_t B; 30 uint32_t C; 31 uint32_t D; 32 uint32_t E; 33 34 uint32_t total[2]; 35 uint32_t buflen; 36 char buffer[128]; 37 }; 38 39 40 /* Initialize structure containing state of computation. */ 41 extern void sha_init_ctx (struct sha_ctx *ctx); 42 43 /* Starting with the result of former calls of this function (or the 44 initialization function update the context for the next LEN bytes 45 starting at BUFFER. 46 It is necessary that LEN is a multiple of 64!!! */ 47 extern void sha_process_block (const void *buffer, size_t len, 48 struct sha_ctx *ctx); 49 50 /* Starting with the result of former calls of this function (or the 51 initialization function update the context for the next LEN bytes 52 starting at BUFFER. 53 It is NOT required that LEN is a multiple of 64. */ 54 extern void sha_process_bytes (const void *buffer, size_t len, 55 struct sha_ctx *ctx); 56 57 /* Process the remaining bytes in the buffer and put result from CTX 58 in first 20 bytes following RESBUF. The result is always in little 59 endian byte order, so that a byte-wise output yields to the wanted 60 ASCII representation of the message digest. 61 62 IMPORTANT: On some systems it is required that RESBUF be correctly 63 aligned for a 32 bits value. */ 64 extern void *sha_finish_ctx (struct sha_ctx *ctx, void *resbuf); 65 66 67 /* Put result from CTX in first 20 bytes following RESBUF. The result is 68 always in little endian byte order, so that a byte-wise output yields 69 to the wanted ASCII representation of the message digest. 70 71 IMPORTANT: On some systems it is required that RESBUF is correctly 72 aligned for a 32 bits value. */ 73 extern void *sha_read_ctx (const struct sha_ctx *ctx, void *resbuf); 74 75 76 /* Compute SHA1 message digest for bytes read from STREAM. The 77 resulting message digest number will be written into the 20 bytes 78 beginning at RESBLOCK. */ 79 extern int sha_stream (FILE *stream, void *resblock); 80 81 /* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The 82 result is always in little endian byte order, so that a byte-wise 83 output yields to the wanted ASCII representation of the message 84 digest. */ 85 extern void *sha_buffer (const char *buffer, size_t len, void *resblock); 86 87 #endif