2018-05-16

import org.bouncycastle.jce.provider.BouncyCastleProvider;

import java.io.ByteArrayOutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.nio.charset.Charset;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;

public class RSA {

private static int MAXENCRYPTSIZE = 117;
private static int MAXDECRYPTSIZE = 128;

/**
 * @param publicKeyByte
 * @return
 */
public static RSAPublicKey getPublicKey(byte[] publicKeyByte) {
    RSAPublicKey publicKey = null;
    try {
        X509EncodedKeySpec x509 = new X509EncodedKeySpec(publicKeyByte);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        publicKey = (RSAPublicKey) keyFactory.generatePublic(x509);
    } catch (InvalidKeySpecException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
    return publicKey;
}

/**
 * @param privateKeyByte
 * @return
 */
public static RSAPrivateKey getPrivateKey(byte[] privateKeyByte) {
    RSAPrivateKey rsaPrivateKey = null;
    try {
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKeyByte);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        rsaPrivateKey = (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
    } catch (InvalidKeySpecException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
    return rsaPrivateKey;
}

/**
 * encrypt
 *
 * @param publicKey
 * @param source
 * @return
 */
public static byte[] encrypt(PublicKey publicKey, byte[] source) {
    try {
        //此处填充方式选择部填充 NoPadding，当然模式和填充方式选择其他的，在Java端可以正确加密解密，
        //但是解密后的密文提交给C#端，解密的得到的数据将产生乱码
        Cipher cipher = Cipher.getInstance("RSA/ECB/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        int length = source.length;
        int offset = 0;
        byte[] cache;
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        int i = 0;
        while (length - offset > 0) {
            if (length - offset > MAXENCRYPTSIZE) {
                cache = cipher.doFinal(source, offset, MAXENCRYPTSIZE);
            } else {
                cache = cipher.doFinal(source, offset, length - offset);
            }
            outStream.write(cache, 0, cache.length);
            i++;
            offset = i * MAXENCRYPTSIZE;
        }
        return outStream.toByteArray();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {
        e.printStackTrace();
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

/**
 * decrypt
 *
 * @param privateKey
 * @param encryptData
 * @return
 */
public static byte[] decrypt(PrivateKey privateKey, byte[] encryptData) {
    //此处模式选择与加密对应，但是需要添加第二个参数new org.bouncycastle.jce.provider.BouncyCastleProvider()
    //若不添加第二个参数的话，解密后的数据前面出现大段空格符
    ByteArrayOutputStream outStream = null;
    try {
        Cipher cipher = Cipher.getInstance("RSA/ECB/NoPadding", new BouncyCastleProvider());
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        int length = encryptData.length;
        int offset = 0;
        int i = 0;
        byte[] cache;
        outStream = new ByteArrayOutputStream();
        while (length - offset > 0) {
            if (length - offset > MAXDECRYPTSIZE) {
                cache = cipher.doFinal(encryptData, offset, MAXDECRYPTSIZE);
            } else {
                cache = cipher.doFinal(encryptData, offset, length - offset);
            }
            outStream.write(cache, 0, cache.length);
            i++;
            offset = i * MAXDECRYPTSIZE;
        }
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {
        e.printStackTrace();
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    }
    return outStream.toByteArray();
}

/**
 * base64编码
 *
 * @param input
 * @return output with base64 encoded
 * @throws Exception
 */
public static String encodeBase64(byte[] input) {
    Object retObj = null;
    try {
        Class clazz = Class.forName("top.axyz.pirate.rsa.Base64");
        Method mainMethod = clazz.getMethod("encode", byte[].class);
        mainMethod.setAccessible(true);
        retObj = mainMethod.invoke(null, new Object[]{input});
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    }
    return (String) retObj;
}

/**
 * base64解码
 *
 * @param input
 * @return
 * @throws Exception
 */
public static byte[] decodeBase64(String input) {
    Object retObj = null;
    try {
        Class clazz = Class.forName("top.axyz.pirate.rsa.Base64");
        Method mainMethod = clazz.getMethod("decode", String.class);
        mainMethod.setAccessible(true);
        retObj = mainMethod.invoke(null, input);
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    }
    return (byte[]) retObj;
}

public static String encrypt(String publicKey, String source) {
    RSAPublicKey rsaPublicKey = getPublicKey(decodeBase64(RSA.publicKey));
    byte[] encryptData = encrypt(rsaPublicKey, source.getBytes(Charset.forName("utf-8")));
    return encodeBase64(encryptData);
}

}

/*

• Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
• ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
  /
  /
• Copyright 1999-2002,2004 The Apache Software Foundation.
• Licensed under the Apache License, Version 2.0 (the "License");
• you may not use this file except in compliance with the License.
• You may obtain a copy of the License at

•  http://www.apache.org/licenses/LICENSE-2.0
  

• Unless required by applicable law or agreed to in writing, software
• distributed under the License is distributed on an "AS IS" BASIS,
• WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
• See the License for the specific language governing permissions and
• limitations under the License.
  */

package top.axyz.pirate.rsa;

/**

• This class provides encode/decode for RFC 2045 Base64 as

• defined by RFC 2045, N. Freed and N. Borenstein.

• RFC 2045: Multipurpose Internet Mail Extensions (MIME)

• Part One: Format of Internet Message Bodies. Reference

• 1996 Available at: http://www.ietf.org/rfc/rfc2045.txt

• This class is used by XML Schema binary format validation

• This implementation does not encode/decode streaming

• data. You need the data that you will encode/decode

• already on a byte arrray.

• @xerces.internal

• @author Jeffrey Rodriguez

• @author Sandy Gao
  */
  public final class Base64 {

  static private final int BASELENGTH = 128;
  static private final int LOOKUPLENGTH = 64;
  static private final int TWENTYFOURBITGROUP = 24;
  static private final int EIGHTBIT = 8;
  static private final int SIXTEENBIT = 16;
  static private final int SIXBIT = 6;
  static private final int FOURBYTE = 4;
  static private final int SIGN = -128;
  static private final char PAD = '=';
  static private final boolean fDebug = false;
  static final private byte [] base64Alphabet = new byte[BASELENGTH];
  static final private char [] lookUpBase64Alphabet = new char[LOOKUPLENGTH];

  static {

   for (int i = 0; i < BASELENGTH; ++i) {
       base64Alphabet[i] = -1;
   }
   for (int i = 'Z'; i >= 'A'; i--) {
       base64Alphabet[i] = (byte) (i-'A');
   }
   for (int i = 'z'; i>= 'a'; i--) {
       base64Alphabet[i] = (byte) ( i-'a' + 26);
   }
  
   for (int i = '9'; i >= '0'; i--) {
       base64Alphabet[i] = (byte) (i-'0' + 52);
   }
  
   base64Alphabet['+']  = 62;
   base64Alphabet['/']  = 63;
  
   for (int i = 0; i<=25; i++)
       lookUpBase64Alphabet[i] = (char)('A'+i);
  
   for (int i = 26,  j = 0; i<=51; i++, j++)
       lookUpBase64Alphabet[i] = (char)('a'+ j);
  
   for (int i = 52,  j = 0; i<=61; i++, j++)
       lookUpBase64Alphabet[i] = (char)('0' + j);
   lookUpBase64Alphabet[62] = (char)'+';
   lookUpBase64Alphabet[63] = (char)'/';
  

  }

  protected static boolean isWhiteSpace(char octect) {
  return (octect == 0x20 || octect == 0xd || octect == 0xa || octect == 0x9);
  }

  protected static boolean isPad(char octect) {
  return (octect == PAD);
  }

  protected static boolean isData(char octect) {
  return (octect < BASELENGTH && base64Alphabet[octect] != -1);
  }

  protected static boolean isBase64(char octect) {
  return (isWhiteSpace(octect) || isPad(octect) || isData(octect));
  }

  /**

  • Encodes hex octects into Base64

  • @param binaryData Array containing binaryData

  • @return Encoded Base64 array
    */
    public static String encode(byte[] binaryData) {

    if (binaryData == null)
    return null;

    int lengthDataBits = binaryData.length*EIGHTBIT;
    if (lengthDataBits == 0) {
    return "";
    }

    int fewerThan24bits = lengthDataBits%TWENTYFOURBITGROUP;
    int numberTriplets = lengthDataBits/TWENTYFOURBITGROUP;
    int numberQuartet = fewerThan24bits != 0 ? numberTriplets+1 : numberTriplets;
    char encodedData[] = null;

    encodedData = new char[numberQuartet*4];

    byte k=0, l=0, b1=0,b2=0,b3=0;

    int encodedIndex = 0;
    int dataIndex = 0;
    if (fDebug) {
    System.out.println("number of triplets = " + numberTriplets );
    }

    for (int i=0; i<numberTriplets; i++) {
    b1 = binaryData[dataIndex++];
    b2 = binaryData[dataIndex++];
    b3 = binaryData[dataIndex++];

     if (fDebug) {
         System.out.println( "b1= " + b1 +", b2= " + b2 + ", b3= " + b3 );
     }
    
     l  = (byte)(b2 & 0x0f);
     k  = (byte)(b1 & 0x03);
    
     byte val1 = ((b1 & SIGN)==0)?(byte)(b1>>2):(byte)((b1)>>2^0xc0);
    
     byte val2 = ((b2 & SIGN)==0)?(byte)(b2>>4):(byte)((b2)>>4^0xf0);
     byte val3 = ((b3 & SIGN)==0)?(byte)(b3>>6):(byte)((b3)>>6^0xfc);
    
     if (fDebug) {
         System.out.println( "val2 = " + val2 );
         System.out.println( "k4   = " + (k<<4));
         System.out.println( "vak  = " + (val2 | (k<<4)));
     }
    
     encodedData[encodedIndex++] = lookUpBase64Alphabet[ val1 ];
     encodedData[encodedIndex++] = lookUpBase64Alphabet[ val2 | ( k<<4 )];
     encodedData[encodedIndex++] = lookUpBase64Alphabet[ (l <<2 ) | val3 ];
     encodedData[encodedIndex++] = lookUpBase64Alphabet[ b3 & 0x3f ];
    

    }

    // form integral number of 6-bit groups
    if (fewerThan24bits == EIGHTBIT) {
    b1 = binaryData[dataIndex];
    k = (byte) ( b1 &0x03 );
    if (fDebug) {
    System.out.println("b1=" + b1);
    System.out.println("b1<<2 = " + (b1>>2) );
    }
    byte val1 = ((b1 & SIGN)==0)?(byte)(b1>>2):(byte)((b1)>>2^0xc0);
    encodedData[encodedIndex++] = lookUpBase64Alphabet[ val1 ];
    encodedData[encodedIndex++] = lookUpBase64Alphabet[ k<<4 ];
    encodedData[encodedIndex++] = PAD;
    encodedData[encodedIndex++] = PAD;
    } else if (fewerThan24bits == SIXTEENBIT) {
    b1 = binaryData[dataIndex];
    b2 = binaryData[dataIndex +1 ];
    l = ( byte ) ( b2 &0x0f );
    k = ( byte ) ( b1 &0x03 );

     byte val1 = ((b1 & SIGN)==0)?(byte)(b1>>2):(byte)((b1)>>2^0xc0);
     byte val2 = ((b2 & SIGN)==0)?(byte)(b2>>4):(byte)((b2)>>4^0xf0);
    
     encodedData[encodedIndex++] = lookUpBase64Alphabet[ val1 ];
     encodedData[encodedIndex++] = lookUpBase64Alphabet[ val2 | ( k<<4 )];
     encodedData[encodedIndex++] = lookUpBase64Alphabet[ l<<2 ];
     encodedData[encodedIndex++] = PAD;
    

    }

    return new String(encodedData);
    }

  /**

  • Decodes Base64 data into octects

  • @param encoded string containing Base64 data

  • @return Array containind decoded data.
    */
    public static byte[] decode(String encoded) {

    if (encoded == null)
    return null;

    char[] base64Data = encoded.toCharArray();
    // remove white spaces
    int len = removeWhiteSpace(base64Data);

    if (len%FOURBYTE != 0) {
    return null;//should be divisible by four
    }

    int numberQuadruple = (len/FOURBYTE );

    if (numberQuadruple == 0)
    return new byte[0];

    byte decodedData[] = null;
    byte b1=0,b2=0,b3=0,b4=0;
    char d1=0,d2=0,d3=0,d4=0;

    int i = 0;
    int encodedIndex = 0;
    int dataIndex = 0;
    decodedData = new byte[ (numberQuadruple)*3];

    for (; i<numberQuadruple-1; i++) {

     if (!isData( (d1 = base64Data[dataIndex++]) )||
             !isData( (d2 = base64Data[dataIndex++]) )||
             !isData( (d3 = base64Data[dataIndex++]) )||
             !isData( (d4 = base64Data[dataIndex++]) ))
         return null;//if found "no data" just return null
    
     b1 = base64Alphabet[d1];
     b2 = base64Alphabet[d2];
     b3 = base64Alphabet[d3];
     b4 = base64Alphabet[d4];
    
     decodedData[encodedIndex++] = (byte)(  b1 <<2 | b2>>4 ) ;
     decodedData[encodedIndex++] = (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) );
     decodedData[encodedIndex++] = (byte)( b3<<6 | b4 );
    

    }

    if (!isData( (d1 = base64Data[dataIndex++]) ) ||
    !isData( (d2 = base64Data[dataIndex++]) )) {
    return null;//if found "no data" just return null
    }

    b1 = base64Alphabet[d1];
    b2 = base64Alphabet[d2];

    d3 = base64Data[dataIndex++];
    d4 = base64Data[dataIndex++];
    if (!isData( (d3 ) ) ||
    !isData( (d4 ) )) {//Check if they are PAD characters
    if (isPad( d3 ) && isPad( d4)) { //Two PAD e.g. 3c[Pad][Pad]
    if ((b2 & 0xf) != 0)//last 4 bits should be zero
    return null;
    byte[] tmp = new byte[ i3 + 1 ];
    System.arraycopy( decodedData, 0, tmp, 0, i3 );
    tmp[encodedIndex] = (byte)( b1 <<2 | b2>>4 ) ;
    return tmp;
    } else if (!isPad( d3) && isPad(d4)) { //One PAD e.g. 3cQ[Pad]
    b3 = base64Alphabet[ d3 ];
    if ((b3 & 0x3 ) != 0)//last 2 bits should be zero
    return null;
    byte[] tmp = new byte[ i3 + 2 ];
    System.arraycopy( decodedData, 0, tmp, 0, i3 );
    tmp[encodedIndex++] = (byte)( b1 <<2 | b2>>4 );
    tmp[encodedIndex] = (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) );
    return tmp;
    } else {
    return null;//an error like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
    }
    } else { //No PAD e.g 3cQl
    b3 = base64Alphabet[ d3 ];
    b4 = base64Alphabet[ d4 ];
    decodedData[encodedIndex++] = (byte)( b1 <<2 | b2>>4 ) ;
    decodedData[encodedIndex++] = (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) );
    decodedData[encodedIndex++] = (byte)( b3<<6 | b4 );

    }

    return decodedData;
    }

  /**

  • remove WhiteSpace from MIME containing encoded Base64 data.

  • @param data the byte array of base64 data (with WS)

  • @return the new length
    */
    protected static int removeWhiteSpace(char[] data) {
    if (data == null)
    return 0;

    // count characters that's not whitespace
    int newSize = 0;
    int len = data.length;
    for (int i = 0; i < len; i++) {
    if (!isWhiteSpace(data[i]))
    data[newSize++] = data[i];
    }
    return newSize;
    }
    }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.X509;
using Org.BouncyCastle.Utilities.Collections;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Pkcs;
using Org.BouncyCastle.Asn1;

namespace RSA
{
class Program
{

    static void Main(string[] args)
    {

        str = System.Web.HttpUtility.UrlDecode(str);
        //生成密钥对  
        //RsaKeyPairGenerator rsaKeyPairGenerator = new RsaKeyPairGenerator();
        //RsaKeyGenerationParameters rsaKeyGenerationParameters = new RsaKeyGenerationParameters(BigInteger.ValueOf(3), new SecureRandom(), 2048, 25);
        //rsaKeyPairGenerator.Init(rsaKeyGenerationParameters);//初始化参数  
        //AsymmetricCipherKeyPair keyPair = rsaKeyPairGenerator.GenerateKeyPair();
        //AsymmetricKeyParameter publicKey = keyPair.Public;//公钥  
        //AsymmetricKeyParameter privateKey = keyPair.Private;//私钥  

        //SubjectPublicKeyInfo subjectPublicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(publicKey);
        //PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKey);

        //Asn1Object asn1ObjectPublic = subjectPublicKeyInfo.ToAsn1Object();
        //byte[] publicInfoByte = asn1ObjectPublic.GetEncoded();
        //Asn1Object asn1ObjectPrivate = privateKeyInfo.ToAsn1Object();
        //byte[] privateInfoByte = asn1ObjectPrivate.GetEncoded();

        //这里可以将密钥对保存到本地  
        //Console.WriteLine("PublicKey:\n" + Convert.ToBase64String(publicInfoByte));
        //Console.WriteLine("PrivateKey:\n" + Convert.ToBase64String(privateInfoByte));

        //加密、解密  
        //Asn1Object pubKeyObj = Asn1Object.FromByteArray(publicInfoByte);//这里也可以从流中读取，从本地导入  
        //AsymmetricKeyParameter pubKey = PublicKeyFactory.CreateKey(SubjectPublicKeyInfo.GetInstance(pubKeyObj));
        IAsymmetricBlockCipher cipher = new RsaEngine();
        //cipher.Init(true, pubKey);//true表示加密  
        //加密  
        //string data = "成功了。。。";
        //Console.WriteLine("\n明文：" + data);
        //byte[] encryptData = cipher.ProcessBlock(Encoding.UTF8.GetBytes(data), 0, Encoding.UTF8.GetBytes(data).Length);
        //Console.WriteLine("密文:" + Convert.ToBase64String(encryptData));
        //解密  
        AsymmetricKeyParameter priKey = PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey));
        cipher.Init(false, priKey);//false表示解密  
        string decryptData = Encoding.UTF8.GetString(cipher.ProcessBlock(Convert.FromBase64String(str), 0, Convert.FromBase64String(str).Length));
        Console.WriteLine("解密后数据：" + decryptData);
        Console.Read();
    }
}

}