--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/simtool/grcard2.c	Sun Feb 07 02:29:07 2021 +0000
@@ -0,0 +1,55 @@
+/*
+ * I, Mother Mychaela, am hoping to get some SIM cards from Grcard
+ * that follow the protocol which the Osmocom community has nicknamed
+ * GrcardSIM2:
+ *
+ * https://osmocom.org/projects/cellular-infrastructure/wiki/GrcardSIM2
+ *
+ * I haven't got these cards yet and may not get them for a long time,
+ * hence the following code has been written blindly, untested.
+ * If anyone in the community happens to have a sysmoSIM-GR2 card
+ * that was once (aeons ago) sold by Sysmocom, please test this code!
+ */
+
+#include <sys/types.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <pcsclite.h>
+#include <winscard.h>
+#include "globals.h"
+
+cmd_grcard2_set_pin(argc, argv)
+	char **argv;
+{
+	u_char cmd[13];
+	int rc;
+
+	/* Grcard2 proprietary command APDU */
+	cmd[0] = 0xA0;
+	cmd[1] = 0xD4;
+	cmd[2] = 0x3A;
+	switch (argv[0][15]) {
+	case '1':
+		cmd[3] = 0x01;
+		break;
+	case '2':
+		cmd[3] = 0x02;
+		break;
+	default:
+		fprintf(stderr, "BUG in grcard2-set-pinN command\n");
+		return(-1);
+	}
+	cmd[4] = 8;
+	rc = encode_pin_entry(argv[1], cmd + 5);
+	if (rc < 0)
+		return(rc);
+	rc = apdu_exchange(cmd, 13);
+	if (rc < 0)
+		return(rc);
+	if (sim_resp_sw != 0x9000) {
+		fprintf(stderr, "bad SW response: %04X\n", sim_resp_sw);
+		return(-1);
+	}
+	return(0);
+}