diff -Nur skey-1.1.5.orig/skey.c skey-1.1.5/skey.c
--- skey-1.1.5.orig/skey.c	2004-11-12 23:09:02.382529123 +0100
+++ skey-1.1.5/skey.c	2004-11-12 23:23:09.864378849 +0100
@@ -46,6 +46,17 @@
 	char	passwd[SKEY_MAX_PW_LEN+1], key[SKEY_BINKEY_SIZE];
 	char	buf[33], *seed, *slash, *t;
 
+	/* If we were called as otp-METHOD, set algorithm based on that */
+	if ((slash = strrchr(argv[0], '/')))
+	    slash++;
+	else
+	    slash = argv[0];
+	if (strncmp(slash, "otp-", 4) == 0) {
+		slash += 4;
+		if (skey_set_algorithm(slash) == NULL)
+			errx(1, "Unknown hash algorithm %s", slash);
+	}
+
 	while ((i = getopt(argc, argv, "fn:p:t:x")) != -1) {
 		switch(i) {
 			case 'f':
diff -Nur skey-1.1.5.orig/skey.1 skey-1.1.5/skey.1
--- skey-1.1.5.orig/skey.1	2004-11-12 23:09:02.375530148 +0100
+++ skey-1.1.5/skey.1	2004-11-12 23:41:43.298268426 +0100
@@ -6,7 +6,7 @@
 .Dt SKEY 1
 .Os
 .Sh NAME
-.Nm skey
+.Nm skey, otp-md4, otp-md5, otp-sha1
 .Nd respond to an OTP challenge
 .Sh SYNOPSIS
 .Nm
@@ -27,13 +27,24 @@
 .Pp
 .Em S/Key
 uses 64 bits of information, transformed by the
-.Tn MD4
+.Tn MD5
 algorithm into 6 English words.
 The user supplies the words to authenticate himself to programs like
 .Xr login 1
 or
 .Xr ftpd 8 .
 .Pp
+When
+.Nm skey
+is invoked as
+.Nm otp-method ,
+.Nm skey
+will use
+.Ar method
+as the hash function where
+.Ar method
+is currently one of md4, md5, or sha1.
+.Pp
 Example use of the
 .Em S/Key
 program