package com.bcxin.Infrastructures.utils;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.IvParameterSpec;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.security.Key;

/**
 * 3DES加密工具类  
 */   
public class DES3 {    
    // 密钥    
    private final static String secretKey = "baichuanxinbbd/baibaodun?#@" ;     
    // 向量    
    private final static String iv = "01234567" ;    
    // 加解密统一使用的编码方式    
    private final static String encoding = "utf-8" ;    
         
    /**  
     * 3DES加密  
     *   
     * @param plainText 普通文本  
     * @return  
     * @throws Exception   
     */   
    public static String encode(String plainText) throws Exception {    
        Key deskey = null ;    
        DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes());    
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance( "desede" );    
        deskey = keyfactory.generateSecret(spec);    
         
        Cipher cipher = Cipher.getInstance( "desede/CBC/PKCS5Padding" );    
        IvParameterSpec ips = new IvParameterSpec(iv.getBytes());    
        cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);    
        byte [] encryptData = cipher.doFinal(plainText.getBytes(encoding));    
        return Base64.encode(encryptData);    
    }    
         
    /**  
     * 3DES解密  
     *   
     * @param encryptText 加密文本  
     * @return  
     * @throws Exception  
     */   
    public static String decode(String encryptText) throws Exception {    
        Key deskey = null ;    
        DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes());     
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance( "desede" );    
        deskey = keyfactory.generateSecret(spec);    
        Cipher cipher = Cipher.getInstance( "desede/CBC/PKCS5Padding" );    
        IvParameterSpec ips = new IvParameterSpec(iv.getBytes());    
        cipher.init(Cipher.DECRYPT_MODE, deskey, ips);    
         
        byte [] decryptData = cipher.doFinal(Base64.decode(encryptText));    
         
        return new String(decryptData, encoding);    
    }


    /**
     * CBC加密
     * @param data 明文
     * @return Base64编码的密文
     * @throws Exception
     */
    public static byte[] des3EncodeCBC(byte[] data)
            throws Exception {
        //密钥
        byte[] key=new BASE64Decoder().decodeBuffer("XkAlKShzZCYmd3R5KiYxMDI5eGNeJikw");
        //IV
        byte[] keyiv = { 1, 2, 3, 4, 5, 6, 7, 8 };
        Key deskey = null;
        DESedeKeySpec spec = new DESedeKeySpec(key);
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
        deskey = keyfactory.generateSecret(spec);

        Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");
        IvParameterSpec ips = new IvParameterSpec(keyiv);
        cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);
        byte[] bOut = cipher.doFinal(data);

        return bOut;
    }

    /**
     * CBC解密
     * @param str 解密串
     * @return 明文
     * @throws Exception
     */
    public static String des3DecodeCBC(String str)
            throws Exception {
        //Base64编码的密文
        byte[] data= new BASE64Decoder().decodeBuffer(str);
        //密钥
        byte[] key=new BASE64Decoder().decodeBuffer("XkAlKShzZCYmd3R5KiYxMDI5eGNeJikw");
        //IV
        byte[] keyiv = { 1, 2, 3, 4, 5, 6, 7, 8 };
        Key deskey = null;
        DESedeKeySpec spec = new DESedeKeySpec(key);
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
        deskey = keyfactory.generateSecret(spec);
        Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");
        IvParameterSpec ips = new IvParameterSpec(keyiv);
        cipher.init(Cipher.DECRYPT_MODE, deskey, ips);
        byte[] bOut = cipher.doFinal(data);
        //返回字符串
        return  new String(bOut, "UTF-8");

    }
      
  public static String padding(String str) {  
       byte[] oldByteArray;  
       try {  
           oldByteArray = str.getBytes("UTF8");  
           int numberToPad = 8 - oldByteArray.length % 8;  
           byte[] newByteArray = new byte[oldByteArray.length + numberToPad];  
           System.arraycopy(oldByteArray, 0, newByteArray, 0,  
                   oldByteArray.length);  
           for (int i = oldByteArray.length; i < newByteArray.length; ++i) {  
               newByteArray[i] = 0;  
           }  
           return new String(newByteArray, "UTF8");  
       } catch (UnsupportedEncodingException e) {  
           System.out.println("Crypter.padding UnsupportedEncodingException");  
       }  
       return null;  
   }  
     
   /**  
     * Base64编码工具类  
     *  
     */   
   public static class Base64 {    
        private static final char [] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" .toCharArray();    
             
        public static String encode( byte [] data) {    
            int start = 0 ;    
            int len = data.length;    
            StringBuffer buf = new StringBuffer(data.length * 3 / 2 );    
             
            int end = len - 3 ;    
            int i = start;    
            int n = 0 ;    
             
            while (i <= end) {    
                int d = (((( int ) data[i]) & 0x0ff ) << 16 ) | (((( int ) data[i + 1 ]) & 0x0ff ) << 8 ) | ((( int ) data[i + 2 ]) & 0x0ff );    
             
                buf.append(legalChars[(d >> 18 ) & 63 ]);    
                buf.append(legalChars[(d >> 12 ) & 63 ]);    
                buf.append(legalChars[(d >> 6 ) & 63 ]);    
                buf.append(legalChars[d & 63 ]);    
             
                i += 3 ;    
             
                if (n++ >= 14 ) {    
                    n = 0 ;    
                    buf.append( " " );    
                }    
            }    
             
            if (i == start + len - 2 ) {    
                int d = (((( int ) data[i]) & 0x0ff ) << 16 ) | (((( int ) data[i + 1 ]) & 255 ) << 8 );    
             
                buf.append(legalChars[(d >> 18 ) & 63 ]);    
                buf.append(legalChars[(d >> 12 ) & 63 ]);    
                buf.append(legalChars[(d >> 6 ) & 63 ]);    
                buf.append( "=" );    
            } else if (i == start + len - 1 ) {    
                int d = ((( int ) data[i]) & 0x0ff ) << 16 ;    
             
                buf.append(legalChars[(d >> 18 ) & 63 ]);    
                buf.append(legalChars[(d >> 12 ) & 63 ]);    
                buf.append( "==" );    
            }    
             
            return buf.toString();    
        }    
             
        private static int decode( char c) {    
            if (c >= 'A' && c <= 'Z' )    
                return (( int ) c) - 65 ;    
            else if (c >= 'a' && c <= 'z' )    
                return (( int ) c) - 97 + 26 ;    
            else if (c >= '0' && c <= '9' )    
                return (( int ) c) - 48 + 26 + 26 ;    
            else   
                switch (c) {    
                case '+' :    
                    return 62 ;    
                case '/' :    
                    return 63 ;    
                case '=' :    
                    return 0 ;    
                default :    
                    throw new RuntimeException( "unexpected code: " + c);    
                }    
        }    
             
        /**  
         * Decodes the given Base64 encoded String to a new byte array. The byte array holding the decoded data is returned.  
         */   
             
        public static byte [] decode(String s) {    
             
            ByteArrayOutputStream bos = new ByteArrayOutputStream();    
            try {    
                decode(s, bos);    
            } catch (IOException e) {    
                throw new RuntimeException();    
            }    
            byte [] decodedBytes = bos.toByteArray();    
            try {    
                bos.close();    
                bos = null ;    
            } catch (IOException ex) {    
                System.err.println( "Error while decoding BASE64: " + ex.toString());    
            }    
            return decodedBytes;    
        }    
             
        private static void decode(String s, OutputStream os) throws IOException {    
            int i = 0 ;    
             
            int len = s.length();    
             
            while ( true ) {    
                while (i < len && s.charAt(i) <= ' ' )    
                    i++;    
             
                if (i == len)    
                    break ;    
             
                int tri = (decode(s.charAt(i)) << 18 ) + (decode(s.charAt(i + 1 )) << 12 ) + (decode(s.charAt(i + 2 )) << 6 ) + (decode(s.charAt(i + 3 )));    
             
                os.write((tri >> 16 ) & 255 );    
                if (s.charAt(i + 2 ) == '=' )    
                    break ;    
                os.write((tri >> 8 ) & 255 );    
                if (s.charAt(i + 3 ) == '=' )    
                    break ;    
                os.write(tri & 255 );    
             
                i += 4 ;    
            }    
        }    
   }   
      
    public static void main(String[] args) throws Exception{
        byte[] key=new BASE64Decoder().decodeBuffer("XkAlKShzZCYmd3R5KiYxMDI5eGNeJikw");
        byte[] keyiv = { 1, 2, 3, 4, 5, 6, 7, 8 };

        byte[] data="15988886666,350321198702232290,20210903101010".getBytes("UTF-8");

        //System.out.println("ECB加密解密");
        //byte[] str3 = des3EncodeECB(key,data );
        //byte[] str4 = ees3DecodeECB(key, str3);
        //System.out.println(new BASE64Encoder().encode(str3));
        //System.out.println(new String(str4, "UTF-8"));

        //System.out.println();

        System.out.println("CBC加密解密");
        byte[] str5 = des3EncodeCBC(data);
        String encoderStr = new BASE64Encoder().encode(str5);
        System.out.println(encoderStr);
        System.out.println(URLEncoder.encode(encoderStr,"UTF-8") );
        System.out.println(DES3.des3DecodeCBC(encoderStr));
        System.out.println(DES3.decode(URLDecoder.decode("AgLMsLKLTGPfn1sL6VTRThmIHkz4N%2FZ4","UTF-8")));
    }
}