desede加密 cbc模式 加密解密工具类 java

desede加密是des的一个加强版 所以实际跟des同key同iv的结果是不一样的 线上没有相关资料我就发一下

import org.apache.tomcat.util.codec.binary.Base64;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class DESedeUtil {

    /**
     * 密钥算法
     */
    private static final String KEY_ALGORITHM = "DESede";

    /**
     * 加密/解密算法 / 工作模式 / 填充方式
     * Java 6支持PKCS5Padding填充方式
     * Bouncy Castle支持PKCS7Padding填充方式
     */
    private static final String CIPHER_ALGORITHM = "DESede/CBC/PKCS5Padding";

    /**
     * 生成密钥
     *
     * @return 密钥
     * @throws Exception
     */
    public static String generateKey() throws Exception {
        //实例化密钥生成器
        KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
        //DESede 要求密钥长度为 112位或168位
        kg.init(168);
        //生成密钥
        SecretKey secretKey = kg.generateKey();
        //获得密钥的字符串形式
        return Base64.encodeBase64String(secretKey.getEncoded());
    }

    /**
     * des加密
     *
     * @param source 源字符串
     * @param key    密钥
     * @return 加密后的密文
     * @throws Exception
     */
    public static String encrypt(String source, String key, String iv) throws Exception {
        byte[] sourceBytes = source.getBytes("UTF-8");
        byte[] keyBytes = Base64.decodeBase64(key);
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes());
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(keyBytes, KEY_ALGORITHM), ivParameterSpec);
        byte[] decrypted = cipher.doFinal(sourceBytes);
        return Base64.encodeBase64String(decrypted);
    }

    /**
     * des解密
     *
     * @param encryptStr 密文
     * @param key        密钥
     * @return 源字符串
     * @throws Exception
     */
    public static String decrypt(String encryptStr, String key, String iv) throws Exception {
        byte[] sourceBytes = Base64.decodeBase64(encryptStr);
        byte[] keyBytes = Base64.decodeBase64(key);
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes());
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(keyBytes, KEY_ALGORITHM), ivParameterSpec);
        byte[] decoded = cipher.doFinal(sourceBytes);
        return new String(decoded, "UTF-8");
    }

}