70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
/*
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* Copyright (c) 1999 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Markus Friedl.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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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("$Id: fingerprint.c,v 1.6 2000/04/12 09:39:10 markus Exp $");
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#include "ssh.h"
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#include "xmalloc.h"
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#include <openssl/md5.h>
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#define FPRINT "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x"
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/*
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* Generate key fingerprint in ascii format.
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* Based on ideas and code from Bjoern Groenvall <bg@sics.se>
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*/
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char *
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fingerprint(BIGNUM *e, BIGNUM *n)
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{
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static char retval[80];
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MD5_CTX md;
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unsigned char d[16];
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unsigned char *buf;
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int nlen, elen;
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nlen = BN_num_bytes(n);
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elen = BN_num_bytes(e);
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buf = xmalloc(nlen + elen);
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BN_bn2bin(n, buf);
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BN_bn2bin(e, buf + nlen);
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MD5_Init(&md);
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MD5_Update(&md, buf, nlen + elen);
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MD5_Final(d, &md);
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snprintf(retval, sizeof(retval), FPRINT,
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d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7],
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d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]);
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memset(buf, 0, nlen + elen);
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xfree(buf);
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return retval;
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}
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