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Sm4CbcExample.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.Sm4Cbc;
import org.gmssl.Random;
public class Sm4CbcExample {
public static void main(String[] args) {
Random rng = new Random();
byte[] key = rng.randBytes(Sm4Cbc.KEY_SIZE);
byte[] iv = rng.randBytes(Sm4Cbc.IV_SIZE);
// Encrypted plaintext is "110101200106032443"
byte[] plaintext = "ID:110101200106032443".getBytes();
int plaintextOffset = "ID:".length();
int plaintextLen = plaintext.length - plaintextOffset;
boolean encrypt = true;
boolean decrypt = false;
int i;
System.out.println("SM4-CBC Example");
Sm4Cbc sm4cbc = new Sm4Cbc();
// Encrypt
byte[] ciphertext = new byte[plaintextLen + Sm4Cbc.BLOCK_SIZE]; // Prepare large enough ciphertext buffer
int ciphertextOffset = 0;
int ciphertextLen;
sm4cbc.init(key, iv, encrypt);
ciphertextLen = sm4cbc.update(plaintext, plaintextOffset, plaintextLen, ciphertext, ciphertextOffset);
ciphertextOffset += ciphertextLen;
ciphertextLen += sm4cbc.doFinal(ciphertext, ciphertextOffset);
System.out.print("ciphertext : ");
for (i = 0; i < ciphertextLen; i++) {
System.out.printf("%02x", ciphertext[i]);
}
System.out.print("\n");
// Decrypt
sm4cbc.init(key, iv, decrypt);
byte[] decrypted = new byte[ciphertextLen + Sm4Cbc.BLOCK_SIZE]; // prepare large enough plaintext buffer
int decryptedOffset = 0;
int decryptedLen;
ciphertextOffset = 0;
decryptedLen = sm4cbc.update(ciphertext, ciphertextOffset, ciphertextLen, decrypted, decryptedOffset);
decryptedOffset += decryptedLen;
decryptedLen += sm4cbc.doFinal(decrypted, decryptedOffset);
System.out.print("decrypted : ");
for (i = 0; i < decryptedLen; i++) {
System.out.printf("%02x", decrypted[i]);
}
System.out.print("\n");
}
}