用bouncycastle实现gost 28147-89算法在java中的加解密

import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.crypto.BufferedBlockCipher;
import org.bouncycastle.crypto.engines.GOST28147Engine;
import org.bouncycastle.crypto.modes.CBCBlockCipher;
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;
import org.bouncycastle.util.encoders.Hex;

import java.nio.charset.StandardCharsets;

public class GOST28147Example {
    public static void main(String[] args) throws Exception {
        // 设置密钥
        byte[] keyBytes = Hex.decode("0123456789abcdef0123456789abcdef");
        KeyParameter key = new KeyParameter(keyBytes);

        // 设置初始向量
        byte[] ivBytes = Hex.decode("0123456789abcdef");
        ParametersWithIV iv = new ParametersWithIV(key, ivBytes);

        // 创建GOST 28147-89算法的实例
        BlockCipher gost28147 = new GOST28147Engine();

        // 使用CBC模式进行加解密
        BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(gost28147));

        // 初始化加密模式
        cipher.init(true, iv);

        // 加密数据
        String plaintext = "Hello, World!";
        byte[] plaintextBytes = plaintext.getBytes(StandardCharsets.UTF_8);
        byte[] ciphertextBytes = new byte[cipher.getOutputSize(plaintextBytes.length)];
        int ciphertextLength = cipher.processBytes(plaintextBytes, 0, plaintextBytes.length, ciphertextBytes, 0);
        cipher.doFinal(ciphertextBytes, ciphertextLength);

        // 打印加密结果
        String ciphertext = new String(Hex.encode(ciphertextBytes), StandardCharsets.UTF_8);
        System.out.println("Ciphertext: " + ciphertext);

        // 初始化解密模式
        cipher.init(false, iv);

        // 解密数据
        byte[] decryptedBytes = new byte[cipher.getOutputSize(ciphertextBytes.length)];
        int decryptedLength = cipher.processBytes(ciphertextBytes, 0, ciphertextBytes.length, decryptedBytes, 0);
        cipher.doFinal(decryptedBytes, decryptedLength);

        // 打印解密结果
        String decryptedText = new String(decryptedBytes, StandardCharsets.UTF_8);
        System.out.println("Decrypted Text: " + decryptedText);
    }
}