Add demos to CMake

demos/src/demo_sm9_encrypt.c

@@ -0,0 +1,47 @@
+/*
+ *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the License); you may
+ *  not use this file except in compliance with the License.
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <gmssl/sm9.h>
+#include <gmssl/error.h>
+
+
+int main(void)
+{
+	SM9_ENC_MASTER_KEY master;
+	SM9_ENC_MASTER_KEY master_public;
+	SM9_ENC_KEY key;
+	const char *id = "Alice";
+	uint8_t buf[512];
+	uint8_t *p = buf;
+	const uint8_t *cp = buf;
+	size_t len;
+	char mbuf[256];
+	size_t mlen;
+	int ret;
+
+	sm9_enc_master_key_generate(&master);
+	sm9_enc_master_key_extract_key(&master, id, strlen(id), &key);
+
+	sm9_enc_master_public_key_to_der(&master, &p, &len);
+	sm9_enc_master_public_key_from_der(&master_public, &cp, &len);
+
+	sm9_encrypt(&master_public, id, strlen(id), (uint8_t *)"hello", strlen("hello"), buf, &len);
+	ret = sm9_decrypt(&key, id, strlen(id), buf, len, (uint8_t *)mbuf, &mlen);
+	if (ret != 1) {
+		fprintf(stderr, "decrypt failed\n");
+		return 1;
+	}
+	mbuf[mlen] = 0;
+	printf("decrypt result: %s\n", mbuf);
+
+	return 0;
+}