Java AES 256 CBC PKCS7 Demo

JavaAes256CbcPkcs7Demo.java

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.spec.AlgorithmParameterSpec;
import java.util.Base64;

public class JavaAes256CbcPkcs7Demo {

    private static final byte[] keys = new byte[]{0x2e, 0x59, 0x46, (byte) 0x93, 0x2e, (byte) 0xf2, (byte) 0x8b, (byte) 0xed, (byte) 0xcf, (byte) 0xb3, (byte) 0xc4, (byte) 0xda, (byte) 0xc2, 0x53, (byte) 0xe8, (byte) 0xbd, 0x1a, 0x33, 0x17, (byte) 0xf3, 0x35, (byte) 0xca, 0x24, 0x40, (byte) 0xa5, 0x6c, 0x5f, 0x11, 0x11, (byte) 0xfa, 0x2e, 0x1b};
    private static final byte[] ivs = new byte[]{(byte) 0xfa, 0x7a, (byte) 0xeb, (byte) 0xcf, 0x29, 0x71, (byte) 0x8d, 0x7b, 0x5a, 0x67, (byte) 0xe4, 0x1d, 0x5c, (byte) 0x8f, 0x79, (byte) 0xa3};

    public static void main(String[] args) {
        System.out.println(encrypt("abcd123!"));
        System.out.println(decrypt("HAXyVME3JVLYSzivsHDMHA=="));
    }

    // 加密
    public static String encrypt(String strToEncrypt) {
        try {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            SecretKeySpec secretKeySpec = new SecretKeySpec(keys, "AES");
            AlgorithmParameterSpec paramSpec = new IvParameterSpec(ivs);
            cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, paramSpec);

            return Base64.getEncoder()
                    .encodeToString(cipher.doFinal(strToEncrypt.getBytes(StandardCharsets.UTF_8)));
        } catch (Exception e) {
            System.out.println("Error while encrypting: " + e.toString());
        }
        return null;
    }

    // 解密
    public static String decrypt(String strToDecrypt) {
        try {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            SecretKeySpec secretKeySpec = new SecretKeySpec(keys, "AES");
            AlgorithmParameterSpec paramSpec = new IvParameterSpec(ivs);
            cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, paramSpec);

            return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
        } catch (Exception e) {
            System.out.println("Error while decrypting: " + e.toString());
        }
        return null;
    }
}