Add demos to CMake

demos/src/demo_sm4_cbc_padding.c

@@ -0,0 +1,105 @@
+/*
+ *  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/sm4.h>
+#include <gmssl/rand.h>
+
+
+int main(void)
+{
+	SM4_KEY sm4_key;
+	unsigned char key[16];
+	unsigned char iv[16];
+	unsigned char mbuf[32] = {
+		0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,
+		0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,
+		0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,
+		0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,
+	};
+	unsigned char cbuf[32] = {0};
+	unsigned char pbuf[32] = {0};
+	size_t mlen1 = 20, mlen2 = 16;
+	size_t clen1, clen2;
+	size_t plen1, plen2;
+	int i;
+
+	rand_bytes(key, sizeof(key));
+	rand_bytes(iv, sizeof(iv));
+
+	printf("key: ");
+	for (i = 0; i < sizeof(key); i++) {
+		printf("%02X", key[i]);
+	}
+	printf("\n");
+
+	printf("iv: ");
+	for (i = 0; i < sizeof(iv); i++) {
+		printf("%02X", iv[i]);
+	}
+	printf("\n");
+
+
+	printf("sm4_cbc_pading encrypt %zu bytes\n", mlen1);
+
+	printf("plaintext: ");
+	for (i = 0; i < mlen1; i++) {
+		printf("%02X", mbuf[i]);
+	}
+	printf("\n");
+
+	sm4_set_encrypt_key(&sm4_key, key);
+	sm4_cbc_padding_encrypt(&sm4_key, iv, mbuf, mlen1, cbuf, &clen1);
+
+	printf("ciphertext: ");
+	for (i = 0; i < clen1; i++) {
+		printf("%02X", cbuf[i]);
+	}
+	printf("\n");
+
+	sm4_set_decrypt_key(&sm4_key, key);
+	sm4_cbc_padding_decrypt(&sm4_key, iv, cbuf, clen1, pbuf, &plen1);
+
+	printf("decrypted: ");
+	for (i = 0; i < plen1; i++) {
+		printf("%02X", pbuf[i]);
+	}
+	printf("\n");
+
+	printf("sm4_cbc_pading encrypt %zu bytes\n", mlen2);
+
+	printf("plaintext: ");
+	for (i = 0; i < mlen2; i++) {
+		printf("%02X", mbuf[i]);
+	}
+	printf("\n");
+
+	sm4_set_encrypt_key(&sm4_key, key);
+	sm4_cbc_padding_encrypt(&sm4_key, iv, mbuf, mlen2, cbuf, &clen2);
+
+	printf("ciphertext: ");
+	for (i = 0; i < clen2; i++) {
+		printf("%02X", cbuf[i]);
+	}
+	printf("\n");
+
+	sm4_set_decrypt_key(&sm4_key, key);
+	sm4_cbc_padding_decrypt(&sm4_key, iv, cbuf, clen2, pbuf, &plen2);
+
+	printf("decrypted: ");
+	for (i = 0; i < plen2; i++) {
+		printf("%02X", pbuf[i]);
+	}
+	printf("\n");
+
+
+	return 0;
+}