1 files changed, 39 insertions, 0 deletions
diff --git a/usr.bin/ssh/fingerprint.c b/usr.bin/ssh/fingerprint.c
new file mode 100644
index 00000000000..c319fa2301f
--- /dev/null
+++ b/usr.bin/ssh/fingerprint.c
@@ -0,0 +1,39 @@
+#include "includes.h"
+RCSID("$Id: fingerprint.c,v 1.1 1999/11/16 22:49:28 markus Exp $");
+
+#include "ssh.h"
+#include "xmalloc.h"
+#include <ssl/md5.h>
+
+#define FPRINT "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x"
+
+/* Generate key fingerprint in ascii format.
+   Based on ideas and code from Bjoern Groenvall <bg@sics.se> */
+
+char *
+fingerprint(BIGNUM *e, BIGNUM *n)
+{
+	static char     retval[80];
+	MD5_CTX         md;
+	unsigned char   d[16];
+	char           *buf;
+	int             nlen, elen;
+
+	nlen = BN_num_bytes(n);
+	elen = BN_num_bytes(e);
+
+	buf = xmalloc(nlen + elen);
+
+	BN_bn2bin(n, buf);
+	BN_bn2bin(e, buf + nlen);
+
+	MD5_Init(&md);
+	MD5_Update(&md, buf, nlen + elen);
+	MD5_Final(d, &md);
+	snprintf(retval, sizeof(retval), FPRINT,
+		 d[0], d[1], d[2],  d[3],  d[4],  d[5],  d[6],  d[7],
+		 d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]);
+	memset(buf, 0, nlen + elen);
+	xfree(buf);
+	return retval;
+}