Add more SM4 modes

tests/sm4_xtstest.c

@@ -0,0 +1,64 @@
+/*
+ *  Copyright 2014-2024 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 <stdint.h>
+#include <gmssl/sm4.h>
+#include <gmssl/hex.h>
+#include <gmssl/rand.h>
+#include <gmssl/error.h>
+
+
+static int test_sm4_xts(void)
+{
+	SM4_KEY sm4_key1;
+	SM4_KEY sm4_key2;
+	uint8_t key[32];
+	size_t len[] = { 16, 16+2, 32, 48+8, 64 };
+	uint8_t plaintext[16 * 4];
+	uint8_t encrypted[sizeof(plaintext)];
+	uint8_t decrypted[sizeof(plaintext)];
+	size_t tweak = 0x12345678;
+	size_t i;
+
+	rand_bytes(key, sizeof(key));
+	rand_bytes(plaintext, sizeof(plaintext));
+
+	for (i = 0; i < sizeof(len)/sizeof(len[0]); i++) {
+
+		sm4_set_encrypt_key(&sm4_key1, key);
+		sm4_set_encrypt_key(&sm4_key2, key + 16);
+		sm4_xts_encrypt(&sm4_key1, &sm4_key2, tweak, plaintext, len[i], encrypted);
+
+		sm4_set_decrypt_key(&sm4_key1, key);
+		sm4_set_encrypt_key(&sm4_key2, key + 16);
+		sm4_xts_decrypt(&sm4_key1, &sm4_key2, tweak, encrypted, len[i], decrypted);
+
+		if (memcmp(decrypted, plaintext, len[i]) != 0) {
+			error_print();
+			return -1;
+		}
+	}
+
+	printf("%s() ok\n", __FUNCTION__);
+	return 1;
+}
+
+int main(void)
+{
+	if (test_sm4_xts() != 1) goto err;
+	printf("%s all tests passed\n", __FILE__);
+	return 0;
+err:
+	error_print();
+	return 1;
+}