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Annotation of src/usr.bin/ssh/fingerprint.c, Revision 1.6

1.4       markus      1: /*
                      2:  * Copyright (c) 1999 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:
1.1       markus     30: #include "includes.h"
1.6     ! markus     31: RCSID("$Id: fingerprint.c,v 1.5 2000/03/16 20:56:14 markus Exp $");
1.1       markus     32:
                     33: #include "ssh.h"
                     34: #include "xmalloc.h"
1.6     ! markus     35: #include <openssl/md5.h>
1.1       markus     36:
                     37: #define FPRINT "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x"
                     38:
1.3       deraadt    39: /*
                     40:  * Generate key fingerprint in ascii format.
                     41:  * Based on ideas and code from Bjoern Groenvall <bg@sics.se>
                     42:  */
1.1       markus     43: char *
                     44: fingerprint(BIGNUM *e, BIGNUM *n)
                     45: {
1.2       markus     46:        static char retval[80];
                     47:        MD5_CTX md;
                     48:        unsigned char d[16];
1.5       markus     49:        unsigned char *buf;
1.2       markus     50:        int nlen, elen;
1.1       markus     51:
                     52:        nlen = BN_num_bytes(n);
                     53:        elen = BN_num_bytes(e);
                     54:
                     55:        buf = xmalloc(nlen + elen);
                     56:
                     57:        BN_bn2bin(n, buf);
                     58:        BN_bn2bin(e, buf + nlen);
                     59:
                     60:        MD5_Init(&md);
                     61:        MD5_Update(&md, buf, nlen + elen);
                     62:        MD5_Final(d, &md);
                     63:        snprintf(retval, sizeof(retval), FPRINT,
1.3       deraadt    64:            d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7],
                     65:            d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]);
1.1       markus     66:        memset(buf, 0, nlen + elen);
                     67:        xfree(buf);
                     68:        return retval;
                     69: }