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-rw-r--r--fingerprint.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/fingerprint.c b/fingerprint.c
new file mode 100644
index 00000000..c319fa23
--- /dev/null
+++ b/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;
+}