--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libcommon/pinentry.c	Thu Feb 11 23:11:57 2021 +0000
@@ -0,0 +1,28 @@
+#include <sys/types.h>
+#include <ctype.h>
+#include <stdio.h>
+
+encode_pin_entry(arg, dest)
+	char *arg;
+	u_char *dest;
+{
+	unsigned n;
+
+	n = 0;
+	while (*arg) {
+		if (!isdigit(*arg)) {
+			fprintf(stderr,
+			"error: PIN argument contains a non-digit character\n");
+			return(-1);
+		}
+		if (n >= 8) {
+			fprintf(stderr, "error: PIN argument is too long\n");
+			return(-1);
+		}
+		*dest++ = *arg++;
+		n++;
+	}
+	for (; n < 8; n++)
+		*dest++ = 0xFF;
+	return(0);
+}