【源码】【通用】EC官方DES加解密java源码

Mr_老冷

对应的js暴露函数是：
encodeDecoder.desEncrypt DES加密​
encodeDecoder.desDecrypt DES解密​
encodeDecoder.des3Encrypt 3DES加密​
encodeDecoder.des3Decrypt 3DES解密

源码:

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import android.util.Base64;

import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.SecureRandom;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class DesUtil {

    private final static String DES = "DES";


    /**
     * Description 根据键值进行加密
     *
     * @param data
     * @param key  加密键byte数组
     * @return
     * @throws Exception
     */
    public static String desCrypt(String data, String key) throws Exception {
        byte[] bt = encrypt(data.getBytes(), key.getBytes());
        return android.util.Base64.encodeToString(bt, 0);
    }

    /**
     * Description 根据键值进行解密
     *
     * @param data
     * @param key  加密键byte数组
     * @return
     * @throws IOException
     * @throws Exception
     */
    public static String desDecrypt(String data, String key) throws Exception {
        if (data == null)
            return null;
        byte[] buf = android.util.Base64.decode(data, Base64.DEFAULT);
        byte[] bt = decrypt(buf, key.getBytes());
        return new String(bt);

    }

    /**
     * Description 根据键值进行加密
     *
     * @param key 加密键byte数组
     * @return
     * @throws Exception
     */
    private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();
        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成加密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }

    /**
     * Description 根据键值进行解密
     *
     * @param data
     * @param key  加密键byte数组
     * @return
     * @throws Exception
     */
    private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }

    public static String des3Crypto(String src, String password) throws Exception {

        DESedeKeySpec deskey = new DESedeKeySpec(password.getBytes());
        SecretKeyFactory skf = SecretKeyFactory.getInstance("DESede");
        Key key = skf.generateSecret(deskey);
        Cipher cipher1 = Cipher.getInstance("DESede/CBC/PKCS5Padding");
        IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());
        cipher1.init(Cipher.ENCRYPT_MODE, key, iv);
        byte[] bbb = cipher1.doFinal(src.getBytes());

        if (bbb != null) {
            bbb = android.util.Base64.encode(bbb, 0);
            return new String(bbb);
        }
        return null;
    }

    public static String des3Decrypt(String src, String password) throws Exception {
        byte[] d = (android.util.Base64.decode(src, 0));
        if (d == null) {
            return null;
        }
        DESedeKeySpec deskey = new DESedeKeySpec(password.getBytes());
        SecretKeyFactory skf = SecretKeyFactory.getInstance("DESede");
        Key key = skf.generateSecret(deskey);
        Cipher cipher1 = Cipher.getInstance("DESede/CBC/PKCS5Padding");
        IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());
        cipher1.init(Cipher.DECRYPT_MODE, key, iv);
        byte[] bbb = cipher1.doFinal(d);
        if (bbb == null) {
            return null;
        }
        return new String(bbb);
    }


}

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