--- a/uicc/hexstr.c	Sun Feb 07 02:47:51 2021 +0000
+++ b/uicc/hexstr.c	Sun Feb 07 04:00:27 2021 +0000
@@ -20,10 +20,10 @@
 	return(-1);
 }
 
-decode_hex_data_from_string(arg, databuf, maxlen)
+decode_hex_data_from_string(arg, databuf, minlen, maxlen)
 	char *arg;
 	u_char *databuf;
-	unsigned maxlen;
+	unsigned minlen, maxlen;
 {
 	unsigned count;
 
@@ -37,15 +37,15 @@
 			return(-1);
 		}
 		if (count >= maxlen) {
-			fprintf(stderr, "error: hex input data is too long\n");
+			fprintf(stderr, "error: hex string is too long\n");
 			return(-1);
 		}
 		databuf[count] = (decode_hex_digit(arg[0]) << 4) |
 				 decode_hex_digit(arg[1]);
 		arg += 2;
 	}
-	if (!count) {
-		fprintf(stderr, "error: empty hex string argument\n");
+	if (count < minlen) {
+		fprintf(stderr, "error: hex string is too short\n");
 		return(-1);
 	}
 	return(count);