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Sm4Example.java

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/*

* Copyright 2014-2023 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

*/

import org.gmssl.Sm4;

import org.gmssl.Random;

import java.util.Arrays;

public class Sm4Example {

public static void main(String[] args) {

Random rng = new Random();

byte[] key = rng.randBytes(Sm4.KEY_SIZE);

byte[] plaintext1 = rng.randBytes(Sm4.BLOCK_SIZE);

byte[] ciphertext = new byte[Sm4.BLOCK_SIZE];

byte[] plaintext2 = new byte[Sm4.BLOCK_SIZE];

Sm4 sm4enc = new Sm4(key, true);

sm4enc.encrypt(plaintext1, 0, ciphertext, 0);

Sm4 sm4dec = new Sm4(key, false);

sm4dec.encrypt(ciphertext, 0, plaintext2, 0);

System.out.println("Sm4 Example");

int i;

System.out.print("Plaintext : ");

for (i = 0; i < plaintext1.length; i++) {

System.out.printf("%02x", plaintext1[i]);

}

System.out.print("\n");

System.out.print("Ciphertext : ");

for (i = 0; i < ciphertext.length; i++) {

System.out.printf("%02x", ciphertext[i]);

}

System.out.print("\n");

System.out.print("Plaintext : ");

for (i = 0; i < plaintext2.length; i++) {

System.out.printf("%02x", plaintext2[i]);

}

System.out.print("\n");

System.out.println("Decryption success : " + Arrays.equals(plaintext1, plaintext2));

}

}