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 * 3. All advertising materials mentioning features or use of this software 13 * must display the following acknowledgement: 14 * This product includes software developed by Markus Friedl. 15 * 4. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include "includes.h" 31 RCSID("$Id: hmac.c,v 1.2 2000/04/12 09:39:10 markus Exp $"); 32 33 #include "xmalloc.h" 34 #include "ssh.h" 35 #include "getput.h" 36 37 #include <openssl/hmac.h> 38 39 unsigned char * 40 hmac( 41 EVP_MD *evp_md, 42 unsigned int seqno, 43 unsigned char *data, int datalen, 44 unsigned char *key, int keylen) 45 { 46 HMAC_CTX c; 47 static unsigned char m[EVP_MAX_MD_SIZE]; 48 unsigned char b[4]; 49 50 if (key == NULL) 51 fatal("hmac: no key"); 52 HMAC_Init(&c, key, keylen, evp_md); 53 PUT_32BIT(b, seqno); 54 HMAC_Update(&c, b, sizeof b); 55 HMAC_Update(&c, data, datalen); 56 HMAC_Final(&c, m, NULL); 57 HMAC_cleanup(&c); 58 return(m); 59 } 60