1 /* 2 * sha1.h 3 * 4 * interface to the Secure Hash Algorithm v.1 (SHA-1), specified in 5 * FIPS 180-1 6 * 7 * David A. McGrew 8 * Cisco Systems, Inc. 9 */ 10 11 /* 12 * 13 * Copyright (c) 2001-2006, Cisco Systems, Inc. 14 * All rights reserved. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 20 * Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 23 * Redistributions in binary form must reproduce the above 24 * copyright notice, this list of conditions and the following 25 * disclaimer in the documentation and/or other materials provided 26 * with the distribution. 27 * 28 * Neither the name of the Cisco Systems, Inc. nor the names of its 29 * contributors may be used to endorse or promote products derived 30 * from this software without specific prior written permission. 31 * 32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 35 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 36 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 37 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 38 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 39 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 41 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 42 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 43 * OF THE POSSIBILITY OF SUCH DAMAGE. 44 * 45 */ 46 47 #ifndef SHA1_H 48 #define SHA1_H 49 50 #include "err.h" 51 #include "datatypes.h" 52 53 typedef struct { 54 uint32_t H[5]; /* state vector */ 55 uint32_t M[16]; /* message buffer */ 56 int octets_in_buffer; /* octets of message in buffer */ 57 uint32_t num_bits_in_msg; /* total number of bits in message */ 58 } sha1_ctx_t; 59 60 /* 61 * sha1(&ctx, msg, len, output) hashes the len octets starting at msg 62 * into the SHA1 context, then writes the result to the 20 octets at 63 * output 64 * 65 */ 66 67 void 68 sha1(const uint8_t *message, int octets_in_msg, uint32_t output[5]); 69 70 /* 71 * sha1_init(&ctx) initializes the SHA1 context ctx 72 * 73 * sha1_update(&ctx, msg, len) hashes the len octets starting at msg 74 * into the SHA1 context 75 * 76 * sha1_final(&ctx, output) performs the final processing of the SHA1 77 * context and writes the result to the 20 octets at output 78 * 79 */ 80 81 void 82 sha1_init(sha1_ctx_t *ctx); 83 84 void 85 sha1_update(sha1_ctx_t *ctx, const uint8_t *M, int octets_in_msg); 86 87 void 88 sha1_final(sha1_ctx_t *ctx, uint32_t output[5]); 89 90 /* 91 * The sha1_core function is INTERNAL to SHA-1, but it is declared 92 * here because it is also used by the cipher SEAL 3.0 in its key 93 * setup algorithm. 94 */ 95 96 /* 97 * sha1_core(M, H) computes the core sha1 compression function, where M is 98 * the next part of the message and H is the intermediate state {H0, 99 * H1, ...} 100 * 101 * this function does not do any of the padding required in the 102 * complete sha1 function 103 */ 104 105 void 106 sha1_core(const uint32_t M[16], uint32_t hash_value[5]); 107 108 #endif /* SHA1_H */ 109
