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encrypt,decrypt interface implements by symmetric,asymmetric,digester
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package top.jfunc.common.crypto.symmetric;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import top.jfunc.common.crypto.CryptoException;
import top.jfunc.common.crypto.KeyCrypto;
import top.jfunc.common.utils.CharsetUtil;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.SecureRandom;

/**
 * 原AESUtil
 * @author xiongshiyan at 2018/7/10
 */
public class AesCrypto implements KeyCrypto {
    private String seed;
    public AesCrypto(String seed){
        this.seed = seed;
    }
    public AesCrypto(){}

    @Override
    public KeyCrypto setKey(String key) {
        this.seed = key;
        return this;
    }

    @Override
    public byte[] encrypt(byte[] src) {
        try {
            //1.构造密钥生成器，指定为AES算法,不区分大小写
            KeyGenerator keygen = KeyGenerator.getInstance("AES");
            //2.根据ecnodeRules规则初始化密钥生成器
            SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );
            secureRandom.setSeed(this.seed.getBytes(CharsetUtil.UTF_8));
            //生成一个128位的随机源,根据传入的字节数组,不能超过128，否则抛出异常，是因为美国对软件出口的限制
            keygen.init(128,secureRandom);
            //3.产生原始对称密钥
            SecretKey original_key = keygen.generateKey();
            //4.获得原始对称密钥的字节数组
            byte[] raw = original_key.getEncoded();
            //5.根据字节数组生成AES密钥
            SecretKey key = new SecretKeySpec(raw, "AES");
            //6.根据指定算法AES自成密码器
            Cipher cipher = Cipher.getInstance("AES");
            //7.初始化密码器，第一个参数为加密(Encrypt_mode)或者解密解密(Decrypt_mode)操作，第二个参数为使用的KEY
            cipher.init(Cipher.ENCRYPT_MODE, key);
            //9.根据密码器的初始化方式--加密：将数据加密
            byte[] byte_AES = cipher.doFinal(src);
            return byte_AES;
        } catch (Exception e) {
            throw new CryptoException(e);
        }
    }

    @Override
    public byte[] decrypt(byte[] src) {
        try {
            //1.构造密钥生成器，指定为AES算法,不区分大小写
            KeyGenerator keygen = KeyGenerator.getInstance("AES");
            SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );
            secureRandom.setSeed(this.seed.getBytes(CharsetUtil.UTF_8));
            //2.根据ecnodeRules规则初始化密钥生成器
            //生成一个128位的随机源,根据传入的字节数组
            keygen.init(128, secureRandom);
            //3.产生原始对称密钥
            SecretKey original_key = keygen.generateKey();
            //4.获得原始对称密钥的字节数组
            byte[] raw = original_key.getEncoded();
            //5.根据字节数组生成AES密钥
            SecretKey key = new SecretKeySpec(raw, "AES");
            //6.根据指定算法AES自成密码器
            Cipher cipher = Cipher.getInstance("AES");
            //7.初始化密码器，第一个参数为加密(Encrypt_mode)或者解密(Decrypt_mode)操作，第二个参数为使用的KEY
            cipher.init(Cipher.DECRYPT_MODE, key);

            return  cipher.doFinal(src);
        } catch (Exception e) {
            throw new CryptoException(e);
        }
    }

    @Override
    public String encrypt(String src, String charset) {
        try {
            byte[] encrypt = encrypt(src.getBytes(charset));
            return new BASE64Encoder().encode(encrypt);
        } catch (Exception e) {
            throw new CryptoException(e);
        }
    }

    @Override
    public String decrypt(String src, String charset) {
        try {
            byte[] bytes = new BASE64Decoder().decodeBuffer(src);
            byte[] decrypt = decrypt(bytes);
            return new String(decrypt , charset);
        } catch (Exception e) {
            throw new CryptoException(e);
        }
    }
}