f4401cd869
alter des.h to be friendly with openssl/des.h (you can include both in the same file) make libkrb to depend on libdes. bump major. massage various portioin of heimdal to be friendly with openssl 0.9.7b.
117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
/* $NetBSD: mac.c,v 1.6 2003/07/24 14:16:56 itojun Exp $ */
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/*
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* Copyright (c) 2001 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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RCSID("$OpenBSD: mac.c,v 1.5 2002/05/16 22:02:50 markus Exp $");
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__RCSID("$NetBSD: mac.c,v 1.6 2003/07/24 14:16:56 itojun Exp $");
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#include <openssl/hmac.h>
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#include "xmalloc.h"
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#include "getput.h"
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#include "log.h"
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#include "cipher.h"
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#include "kex.h"
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#include "mac.h"
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struct {
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char *name;
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const EVP_MD * (*mdfunc)(void);
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int truncatebits; /* truncate digest if != 0 */
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} macs[] = {
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{ "hmac-sha1", EVP_sha1, 0, },
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{ "hmac-sha1-96", EVP_sha1, 96 },
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{ "hmac-md5", EVP_md5, 0 },
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{ "hmac-md5-96", EVP_md5, 96 },
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{ "hmac-ripemd160", EVP_ripemd160, 0 },
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{ "hmac-ripemd160@openssh.com", EVP_ripemd160, 0 },
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{ NULL, NULL, 0 }
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};
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int
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mac_init(Mac *mac, char *name)
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{
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int i;
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for (i = 0; macs[i].name; i++) {
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if (strcmp(name, macs[i].name) == 0) {
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if (mac != NULL) {
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mac->md = (*macs[i].mdfunc)();
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mac->key_len = mac->mac_len = EVP_MD_size(mac->md);
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if (macs[i].truncatebits != 0)
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mac->mac_len = macs[i].truncatebits/8;
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}
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debug2("mac_init: found %s", name);
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return (0);
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}
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}
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debug2("mac_init: unknown %s", name);
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return (-1);
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}
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u_char *
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mac_compute(Mac *mac, u_int32_t seqno, u_char *data, int datalen)
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{
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HMAC_CTX c;
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static u_char m[EVP_MAX_MD_SIZE];
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u_char b[4];
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if (mac->key == NULL)
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fatal("mac_compute: no key");
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if (mac->mac_len > sizeof(m))
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fatal("mac_compute: mac too long");
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HMAC_Init(&c, mac->key, mac->key_len, mac->md);
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PUT_32BIT(b, seqno);
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HMAC_Update(&c, b, sizeof(b));
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HMAC_Update(&c, data, datalen);
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HMAC_Final(&c, m, NULL);
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HMAC_cleanup(&c);
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return (m);
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}
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/* XXX copied from ciphers_valid */
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#define MAC_SEP ","
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int
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mac_valid(const char *names)
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{
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char *maclist, *cp, *p;
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if (names == NULL || strcmp(names, "") == 0)
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return (0);
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maclist = cp = xstrdup(names);
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for ((p = strsep(&cp, MAC_SEP)); p && *p != '\0';
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(p = strsep(&cp, MAC_SEP))) {
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if (mac_init(NULL, p) < 0) {
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debug("bad mac %s [%s]", p, names);
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xfree(maclist);
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return (0);
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} else {
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debug3("mac ok: %s [%s]", p, names);
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}
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}
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debug3("macs ok: [%s]", names);
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xfree(maclist);
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return (1);
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}
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