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Sm4Example.java
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53 lines (42 loc) · 1.37 KB
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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));
}
}