--- a/simtool/grcard2.c	Sun Mar 07 20:24:05 2021 +0000
+++ b/simtool/grcard2.c	Tue Mar 09 02:01:27 2021 +0000
@@ -11,6 +11,8 @@
 #include <sys/types.h>
 #include <stdio.h>
 #include "simresp.h"
+#include "curfile.h"
+#include "file_id.h"
 
 cmd_grcard2_set_pin(argc, argv)
 	char **argv;
@@ -181,3 +183,49 @@
 	}
 	return(0);
 }
+
+static
+select_ef_weki()
+{
+	int rc;
+
+	rc = select_op(DF_GSM);
+	if (rc < 0)
+		return(rc);
+	rc = select_op(0x0001);		/* proprietary EF */
+	if (rc < 0)
+		return(rc);
+	rc = parse_ef_select_response();
+	if (rc < 0)
+		return(rc);
+	if (curfile_structure != 0x00 || curfile_total_size != 35) {
+		fprintf(stderr,
+			"error: EF_WEKI is not a transparent EF of 35 bytes\n");
+		return(-1);
+	}
+	return(0);
+}
+
+cmd_grcard2_set_comp128(argc, argv)
+	char **argv;
+{
+	int rc;
+	unsigned code;
+	u_char magic_byte;
+
+	if (argv[1][0] < '1' || argv[1][0] > '3' || argv[1][1]) {
+		fprintf(stderr, "error: invalid argument\n");
+		return(-1);
+	}
+	code = argv[1][0] - '1';
+	rc = select_ef_weki();
+	if (rc < 0)
+		return(rc);
+	rc = readbin_op(2, 1);
+	if (rc < 0)
+		return(rc);
+	magic_byte = sim_resp_data[0];
+	magic_byte &= 0xFC;
+	magic_byte |= code;
+	return update_bin_op(2, &magic_byte, 1);
+}