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46 lines
1023 B
C
46 lines
1023 B
C
#include "includes.h"
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RCSID("$Id: fingerprint.c,v 1.1 1999/11/17 06:29:08 damien Exp $");
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#include "ssh.h"
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#include "xmalloc.h"
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#ifdef HAVE_OPENSSL
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#include <openssl/md5.h>
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#endif
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#ifdef HAVE_SSL
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#include <ssl/md5.h>
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#endif
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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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/* 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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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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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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