1 /* 2 * Copyright (c) 2000 Markus Friedl. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25 #include "includes.h" 26 RCSID("$OpenBSD: hmac.c,v 1.4 2000/09/07 20:27:51 deraadt Exp $"); 27 28 #include "xmalloc.h" 29 #include "ssh.h" 30 #include "getput.h" 31 32 #include <openssl/hmac.h> 33 34 unsigned char * 35 hmac( 36 EVP_MD *evp_md, 37 unsigned int seqno, 38 unsigned char *data, int datalen, 39 unsigned char *key, int keylen) 40 { 41 HMAC_CTX c; 42 static unsigned char m[EVP_MAX_MD_SIZE]; 43 unsigned char b[4]; 44 45 if (key == NULL) 46 fatal("hmac: no key"); 47 HMAC_Init(&c, key, keylen, evp_md); 48 PUT_32BIT(b, seqno); 49 HMAC_Update(&c, b, sizeof b); 50 HMAC_Update(&c, data, datalen); 51 HMAC_Final(&c, m, NULL); 52 HMAC_cleanup(&c); 53 return(m); 54 } 55