sm2 with short ciphertext

demos/otp/Makefile

@@ -0,0 +1,5 @@
+all:
+	gcc mkgen.c ../../libcrypto.a -o mkgen
+	gcc tkgen.c ../../libcrypto.a -o tkgen
+clean:
+	rm -fr mkgen tkgen

demos/otp/mkgen.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <libgen.h>
+#include <openssl/rand.h>
+
+int main(int argc, char **argv)
+{
+	unsigned char mk[32];
+	int i;
+
+	RAND_bytes(mk, sizeof(mk));
+	
+	for (i = 0; i < sizeof(mk); i++) {
+		printf("%02x", mk[i]);
+	}
+	printf("\n");
+	
+	return 0;
+}
+

demos/otp/tkgen.c

@@ -0,0 +1,49 @@
+#include <time.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <libgen.h>
+#include <openssl/bn.h>
+#include <openssl/evp.h>
+#include <openssl/otp.h>
+#include <openssl/rand.h>
+
+
+int main(int argc, char **argv)
+{
+	char *prog;
+	char *id;
+	char *mk;
+	int offset;
+	OTP_PARAMS params;
+	unsigned int otp;
+
+	prog = basename(argv[0]);
+
+	if (argc < 3) {
+		printf("usage: %s <event> <key> [<offset>]\n", prog);
+		return 0;
+	}
+
+	id = argv[1];
+	mk = argv[2];
+
+	if (argc > 3)
+		offset = atoi(argv[3]);
+
+	params.type = NID_sm3;
+	params.te = 60;
+	params.option = "end";
+	params.option_size = strlen(params.option);
+	params.otp_digits = 6;
+	params.offset = offset;
+
+	OpenSSL_add_all_algorithms();
+	if (!OTP_generate(&params, id, strlen(id), &otp, (unsigned char *)mk, strlen(mk))) {
+		fprintf(stderr, "failed\n");
+	}
+
+	printf("OTP = %06u\n", otp);	
+	return 0;
+}
+