12.14

package com.itheima.test3;



public class DESFactory implements MethodFactory {
    public DES produceMethod() {
        System.out.println("使用DES算法");
        return new DES();
    }
}

 

 

 

package com.itheima.test3;


import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;


import javax.crypto.spec.SecretKeySpec;
import java.security.Key;
import java.security.Security;

public class IDEA implements Method {

    public static final String KEY_ALGORITHM = "IDEA";

    public static final String CIPHER_ALGORITHM = "IDEA/ECB/ISO10126Padding";

    public static byte[] initkey() throws Exception {
        // 加入bouncyCastle支持
        Security.addProvider(new BouncyCastleProvider());

        // 实例化密钥生成器
        KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
        // 初始化密钥生成器，IDEA要求密钥长度为128位
        kg.init(128);
        // 生成密钥
        SecretKey secretKey = kg.generateKey();
        // 获取二进制密钥编码形式
        return secretKey.getEncoded();
    }


    private static Key toKey(byte[] key) throws Exception {
        // 实例化DES密钥
        // 生成密钥
        SecretKey secretKey = new SecretKeySpec(key, KEY_ALGORITHM);
        return secretKey;
    }


    private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
        // 加入bouncyCastle支持
        Security.addProvider(new BouncyCastleProvider());
        // 还原密钥
        Key k = toKey(key);
        // 实例化
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        // 初始化，设置为加密模式
        cipher.init(Cipher.ENCRYPT_MODE, k);
        // 执行操作
        return cipher.doFinal(data);
    }


    private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        // 加入bouncyCastle支持
        Security.addProvider(new BouncyCastleProvider());
        // 还原密钥
        Key k = toKey(key);
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        // 初始化，设置为解密模式
        cipher.init(Cipher.DECRYPT_MODE, k);
        // 执行操作
        return cipher.doFinal(data);
    }

    public static String getKey() {
        String result = null;
        try {
            result = Base64.encodeBase64String(initkey());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    public static String ideaEncrypt(String data, String key) {
        String result = null;
        try {
            byte[] data_en = encrypt(data.getBytes(), Base64.decodeBase64(key));
            result = Base64.encodeBase64String(data_en);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    public static String ideaDecrypt(String data, String key) {
        String result = null;
        try {
            byte[] data_de = decrypt(Base64.decodeBase64(data), Base64.decodeBase64(key));
            ;
            result = new String(data_de);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }