David.Turing's blog

 

RSAUtils for Java Public Encryption

 

package  org.dev2dev.security.crypto.Asymmetric;

 import  java.io.BufferedInputStream;
 import  java.io.BufferedOutputStream;
 import  java.io.BufferedReader;
 import  java.io.ByteArrayInputStream;
 import  java.io.ByteArrayOutputStream;
 import  java.io.FileInputStream;
 import  java.io.FileNotFoundException;
 import  java.io.FileOutputStream;
 import  java.io.IOException;
 import  java.io.InputStream;
 import  java.io.InputStreamReader;
 import  java.io.OutputStream;
 import  java.math.BigInteger;
 import  java.security.SecureRandom;

 import  org.bouncycastle.crypto.AsymmetricBlockCipher;
 import  org.bouncycastle.crypto.AsymmetricCipherKeyPair;
 import  org.bouncycastle.crypto.DataLengthException;
 import  org.bouncycastle.crypto.encodings.OAEPEncoding;
 import  org.bouncycastle.crypto.encodings.PKCS1Encoding;
 import  org.bouncycastle.crypto.engines.DESEngine;
 import  org.bouncycastle.crypto.engines.RSAEngine;
 import  org.bouncycastle.crypto.generators.RSAKeyPairGenerator;
 import  org.bouncycastle.crypto.params.RSAKeyGenerationParameters;
 import  org.bouncycastle.crypto.params.RSAKeyParameters;
 import  org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters;
 import  org.bouncycastle.util.encoders.Hex;
 import  org.dev2dev.security.crypto.blockcipher.BlockCipherTool;


 /**
 *    RSA工具类 
 *  @author   david.turing
 * @copyright GuangZhou BEA Usergroup
 *  @version  0.7
 * @modifyTime  22:30:34
  */
public   class  RSAUtils  {
    
     int  keylength = 1024 ;
     int  certainty = 20 ;
    RSAKeyGenerationParameters keyparam;
    AsymmetricBlockCipher   eng  =   null ;
    RSAKeyPairGenerator  pGen  =   null ;    
    AsymmetricCipherKeyPair  pair  =   null ;    
    
     public  RSAUtils()
     {
        
    }
    
     public  String getName()
     {
         return   " RSA " ;
    }
    
     /**
     * 设置RSA的密钥长度
     *  @param  rsakeylength
      */
     public   void  setKeyLength( int  rsakeylength)
     {
         if (rsakeylength == 512 || rsakeylength == 768 || rsakeylength == 1024 || rsakeylength == 2048 )
                keylength = rsakeylength;
    }
    
     /**
     * 设置RSA Key Pair的素数产生经度，该数值越大，理论产生的RSA Key安全性越高
     *  @param  certaintyofprime
      */
     public   void  setCertaintyOfPrime( int  certaintyofprime)
     {
        certainty = certaintyofprime;
    }
    
     /**
     * 生成RSA Keypair，如果你不是通过ImportPublicKey和ImportPrivateKey
     * 来导入密钥对，则可通过此方法随机生成。
     * 
     *  @return  RSAKeyGenerationParameters
      */
     public   void  initRSAKeyPair()
     {
         /**
         * 注意， 第一个参数被写死了，它是publicExponent, 即e
         * e通常选3，17，65537
         * X.509建议使用65537
         * PEM建议使用3
         * PKCS#1建议使用3或65537
         * 在本算法中，它使用了3，即0x3
          */         
        RSAKeyGenerationParameters rsaparam =
             new  RSAKeyGenerationParameters(BigInteger.valueOf( 0x3 ), 
                     new  SecureRandom(),  this .keylength,  this .certainty);        
         this .keyparam  =  rsaparam;
         // RSA Keypair的生成依赖于rsaparam
        RSAKeyPairGenerator  pGen  =   new  RSAKeyPairGenerator();
        pGen.init(keyparam);
        pair  =  pGen.generateKeyPair();        
        pair.getPublic();
    }
    
     /**
     * 设置RSA密钥对，此方法用于从外部文件导入RSA密钥对
     *  @see  ImportPublicKey(String)
     *  @see  ImportPrivateKey(String)
     *  @param  pubparam 公钥
     *  @param  privparam  私钥
      */
     public   void  setRSAKeyPair(RSAKeyParameters pubparam, RSAPrivateCrtKeyParameters privparam)
     {
        AsymmetricCipherKeyPair newpair = new  AsymmetricCipherKeyPair(pubparam,privparam);
        pair = newpair;
        
    }
    
     /**
     * 该函数返回公钥
     *  @return
      */
     public  RSAKeyParameters getPublicKey()
     {
             return  (RSAKeyParameters)pair.getPublic();            
    }
    
     /**
     * 该函数返回私钥
     * 注意，RSAPrivateCrtKeyParameters其实继承了RSAKeyParameters
     *  @see  getPublicKey()
     *  @return
      */     
     public  RSAPrivateCrtKeyParameters getPrivateKey()
     {
         return  (RSAPrivateCrtKeyParameters)pair.getPrivate();
    }
    
     /**
     * RSA的padding模式，安全性依次递增
     * mode=1  RAW RSA 安全性最差
     * mode=2  PKCS1
     * mode=3  OAEP
     *  @param  mode
      */
     public   void  setRSAMode( int  mode)
     {
        eng  =   new  RSAEngine();  // 默认就是RAW模式, 安全性问题，已不再使用
         if  (mode == 2 )
            eng  =   new  PKCS1Encoding(eng);
         else
            eng  =   new  OAEPEncoding(eng);     // mode==3
    }
    
     /**
     * 该RSAEngine的每次处理输入数据，以Block为单位，是32Bytes
     * 因此，本函数的输入要严格控制在32Byte，即256bit数据
     * 超出该长度会抛出异常。
     * 本函数要求输入必须为16进制字符0-F。
     * 
     *  @see   Decrypt(String input)
     *  @param  input 
     *  @return
      */
     public  String  encrypt(String input)
     {

         byte [] inputdata = Hex.decode(input);

         // 用公钥加密
        eng.init( true , pair.getPublic());        
        
        System.out.println( " >>>加密参数 " );
        System.out.println( " >>>明文字节数： " + inputdata.length);
        System.out.println( " >>>RSA Engine Input Block Size= " + this .eng.getInputBlockSize());
        System.out.println( " >>>RSA Engine Output Block Size= " + this .eng.getOutputBlockSize());
        
         try
         {
            inputdata  =  eng.processBlock(inputdata,  0 , inputdata.length);
        }
         catch  (Exception e)
         {
            e.printStackTrace();
        }         
        
         return   new  String(Hex.encode(inputdata));
    }
    
     /**
     * 该函数输入为字节，并规定其长度为32字节
     * 超出该长度会抛出异常
     *  @see  Decrypt(byte[] inputdata)
     *  @param  inputdata
     *  @return
      */
     public   byte []  encrypt( byte [] inputdata)
     {
         byte [] outputdata = null ;

         // 用公钥加密
        eng.init( true , pair.getPublic());        
        
         try
         {
            inputdata  =  eng.processBlock(inputdata,  0 , inputdata.length);
            outputdata = new   byte [eng.getOutputBlockSize()];
            outputdata = inputdata;
        }
         catch  (Exception e)
         {
            e.printStackTrace();
        }         
        
         return  outputdata;
    }
    
    
     /**
     * 加密ByteArrayInputStream流，在该方法中，会对input做分段处理，每段都将会
     * 以inBlockSize来划分明文，密文同样会设置换行，因此，将来在加密过程中，密文
     * 需要分行读入，在明文、密文，唯一对应的是inBlock和outBlock，它们是换行对应的。
     *
     * 本函数已经处理结尾Block问题
     *  @param  input
     *  @param  Key
     *  @return
      */
     public   byte [] encryptPro( byte [] inputload)
     {
        ByteArrayInputStream inputstream = new  ByteArrayInputStream(inputload);        
        ByteArrayOutputStream outputstream = new  ByteArrayOutputStream();
                
        
         // 用公钥加密
        eng.init( true , pair.getPublic());        
        
         int  inBlockSize  = this .eng.getInputBlockSize() ;
         int  outBlockSize  =   this .eng.getOutputBlockSize();

         try   {
            System.out.println( " 加密的 InBlockSize= " + inBlockSize);
            System.out.println( " 加密的outBlockSize= " + outBlockSize);

            encryptPro(inputstream, outputstream);
                   
        }   catch  (DataLengthException e)  {
            e.printStackTrace();
        }   catch  (IllegalStateException e)  {
            e.printStackTrace();
        }   catch (Exception e) {
            e.printStackTrace();
        }     
        
         byte []  outputload = outputstream.toByteArray();
        
        
         System.out.println( " ###[1]明文大小： " + inputload.length);
         System.out.println( " ###[1]密文大小： " + outputload.length);     
         
         return  outputload;
    }

     /**
     * 加密BufferedInputStream流，在该方法中，会对input做分段处理，每段都将会
     * 以inBlockSize来划分明文，密文同样会设置换行，因此，将来在加密过程中，密文
     * 需要分行读入，在明文、密文，唯一对应的是inBlock和outBlock，它们是换行对应的。
     *
     *此函数未处理padding，如果你不想自己调整padding，请用encryptPro
     * @see  encryptPro(BufferedInputStream inputstream,BufferedOutputStream outputstream)
     *
     *  @param  input
     *  @param  Key
     *  @return
      */
     public   void  encrypt(BufferedInputStream inputstream,BufferedOutputStream outputstream)
     {
         // 用公钥加密
        eng.init( true , pair.getPublic());        
        
         int  inBlockSize  = this .eng.getInputBlockSize() ;
         int  outBlockSize  =   this .eng.getOutputBlockSize();

         byte [] inblock  =   new   byte [inBlockSize];
         byte [] outblock  =   new   byte [outBlockSize];

         byte [] rv  =   null ;
         try   {
             while  (inputstream.read(inblock,  0 , inBlockSize)  >   0 )
             {
                outblock  =  eng.processBlock(inblock,  0 , inBlockSize);
                    rv  =  Hex.encode(outblock,  0 , outBlockSize);
                    outputstream.write(rv,  0 , rv.length);
                    outputstream.write( ' \n ' );

            }
                        
        }   catch  (DataLengthException e)  {
            e.printStackTrace();
        }   catch  (IllegalStateException e)  {
            e.printStackTrace();
        }   catch (Exception e) {
            e.printStackTrace();
        }     
        
    }

    
     /**
     * 加密BufferedInputStream流，在该方法中，会对input做分段处理，每段都将会
     * 以inBlockSize来划分明文，密文同样会设置换行，因此，将来在加密过程中，密文
     * 需要分行读入，在明文、密文，唯一对应的是inBlock和outBlock，它们是换行对应的。
     *
     * 该函数会在加密文件的头部注明padding_size
     * padding_size即padding_size即明文流按照inBlockSize划分后
     * 最后一个block的未占满的大小（字节数）
     * 
     *  @param  input
     *  @param  Key
     *  @return
      */
     public   void  encryptPro(InputStream inputstream,OutputStream outputstream)
     {
         // 用公钥加密
        eng.init( true , pair.getPublic());        
        
         int  inBlockSize  = this .eng.getInputBlockSize() ;
         int  outBlockSize  =   this .eng.getOutputBlockSize();

         byte [] inblock  =   new   byte [inBlockSize];
         byte [] outblock  =   new   byte [outBlockSize];
        
        
         byte [] rv  =   null ;
        
         try   {

             // System.out.println("stream length="+inputstream.available());
             int  padding_size = inBlockSize - (inputstream.available()  %  inBlockSize);
             // System.out.println("padding_size="+padding_size);
            
             /* 写入padding_size，处理最后一个Block不够inBlockSize的情况
             * 记住不要自己修改inBlockSize，因为RSA共有三种模式，每种模式
             * 对Padding的处理方式都不一样，所以，不要修改对processBlock
             * 的加密解密方式。总之，不要修改RSA的inBlock！
              */
            outputstream.write((padding_size + "" ).getBytes()); 
            outputstream.write( ' \n ' );
            
             while  (inputstream.read(inblock,  0 , inBlockSize)  >   0 )                
             {                                
                outblock  =  eng.processBlock(inblock,  0 , inBlockSize);
                rv  =  Hex.encode(outblock,  0 , outBlockSize);
                
                 // System.out.println("Hex len="+rv.length);
                outputstream.write(rv,  0 , rv.length);                                    
                
                outputstream.write( ' \n ' );              
            }
                        
        }   catch  (DataLengthException e)  {
            e.printStackTrace();
        }   catch  (IllegalStateException e)  {
            e.printStackTrace();
        }   catch (Exception e) {
            e.printStackTrace();
        }     
        
    }
    
     /**
     * 解密字符串
     *  @param  input
     *  @return
      */
     public  String decrypt(String input)
     {

         byte [] inputdata = Hex.decode(input);
        
        eng.init( false ,pair.getPrivate());
        System.out.println( " >>>加密参数 " );
        System.out.println( " >>>RSA Engine Input Block Size= " + this .eng.getInputBlockSize());
        System.out.println( " >>>RSA Engine Output Block Size= " + this .eng.getOutputBlockSize());
        
         try
         {
            inputdata = eng.processBlock(inputdata, 0 ,inputdata.length);            
        }
         catch (Exception e)
         {
            e.printStackTrace();
        }
        
         return   new  String(Hex.encode(inputdata));
        
    }
    
     /**
     * 解密字节数组
     *  @param  inputdata
     *  @return
      */
     public   byte []  decrypt( byte [] inputdata)
     {
         byte [] outputdata = null ;

         // 用公钥加密
        eng.init( false , pair.getPrivate());        
        
         try
         {
            inputdata  =  eng.processBlock(inputdata,  0 , inputdata.length);
            outputdata = new   byte [eng.getOutputBlockSize()];
            outputdata = inputdata;
        }
         catch  (Exception e)
         {
            e.printStackTrace();
        }         
        
         return  outputdata;
    }

     /**
     * 解密流
     * 
     * 本函数已经处理结尾Block问题
     *  @see  encryptPro(byte[] inputload)
     * 
     *  @param  inputstream  被加密过的流
     *  @param  outputstream  解密输出的流
      */
     public   byte [] decryptPro( byte [] inputload)
     {

        ByteArrayInputStream inputstream = new  ByteArrayInputStream(inputload);        
        ByteArrayOutputStream outputstream = new  ByteArrayOutputStream();
    
         // 设置引擎
        eng.init( false , pair.getPrivate());    
        
         int  inBlockSize  = this .eng.getInputBlockSize() ;
         int  outBlockSize  =   this .eng.getOutputBlockSize();
                
         try   {
            System.out.println( " 解密的In BlockSize= " + inBlockSize);
            System.out.println( " 解密的out BlockSize= " + outBlockSize);

             this .decryptPro(inputstream, outputstream);
        }   catch  (DataLengthException e)  {
            e.printStackTrace();
        }   catch  (IllegalStateException e)  {
            e.printStackTrace();
        }  
         catch (Exception e)
         {
            e.printStackTrace();
        }
        
         // System.out.println("解密。。。outputload="+new String(outputload));
        
         // byte[] outputload=new byte[outputstream.size()];
         byte [] outputload = outputstream.toByteArray();    
        
         System.out.println( " ###[2]密文大小： " + inputload.length);
         System.out.println( " ###[2]明文大小： " + outputload.length);     
         
         return  outputload;
    }     
    

    
     /**     
     * 解密RSA流，首先先读取RSA的流的padding_size（第一行） 
     * 
     *  @param  inputstream  被加密过的流
     *  @param  outputstream  解密输出的流
      */
     public   void  decryptPro(InputStream inputstream, OutputStream outputstream)
     {
         // 设置引擎
        eng.init( false , pair.getPrivate());    
      
        BufferedReader br  =   new  BufferedReader( new  InputStreamReader(inputstream));
        
         int  inBlockSize  = this .eng.getInputBlockSize() ;
         int  outBlockSize  =   this .eng.getOutputBlockSize();
        
         int  lines;

         byte [] outblock  =   new   byte [outBlockSize];
        
        String rv  =   null ;
         int  inL = 0 ;
         byte [] last = null ;
        
         try   {
             int  amout = inputstream.available();
            lines = amout / (inBlockSize * 2 );
             // System.out.println("lines="+lines);
            rv = br.readLine();                                
            
             // System.out.println("#########padding size="+rv);
             int  padding_size = Integer.parseInt(rv);

             while  ((rv  =  br.readLine())  !=   null )
             {
                lines -- ;
                 /*     要注意，Hex处理密文是将每个byte用2个16进制表示
                 * 一个Hex码其实只需4bit来表示，一个byte有8bit，因此
                 * 需要2个Hex码表示，所以，一个字符经Hex Encode会
                 * 变成两个Hex字符。                
                 */
                inL = rv.length() / 2 ;  
                last = new   byte [inL];
                last  =  Hex.decode(rv);
                
                outblock  =  eng.processBlock(last,  0 , inBlockSize);
                
                 if (lines > 0 )
                 {                
                    outputstream.write(outblock,  0 , outBlockSize);
                }
                 else
                    outputstream.write(outblock,  0 , outBlockSize - padding_size);
                
            }
            
        }   catch  (DataLengthException e)  {
            e.printStackTrace();
        }   catch  (IllegalStateException e)  {
            e.printStackTrace();
        }  
         catch (Exception e)
         {
            e.printStackTrace();
        }

    }     
    
     /**
     * 输出公钥到文件
     *  @param  Filename
      */
     public   void  ExportPublicKey(String Filename)
     {  
        String outfile  =  Filename;
        BufferedOutputStream outstream  =   null ;        

         try
         {
            outstream  =   new  BufferedOutputStream( new  FileOutputStream(outfile));
        }
         catch  (IOException fnf)
         {
            System.err.println( " 无法创建公钥文件 [ " + outfile + " ] " );
            System.exit( 1 );
        }         
        
        
        RSAKeyParameters mypubkey = this .getPublicKey();
        BigInteger mypubkey_modulus = mypubkey.getModulus();        
        BigInteger mypubkey_exponent = mypubkey.getExponent();
        System.out.println( " [ExportPublicKey]mypubkey_modulus= " + mypubkey_modulus.toString());
        System.out.println( " [ExportPublicKey]mypubkey_exponent= " + mypubkey_exponent);
         
         try
         {
            outstream.write(mypubkey_modulus.toString().getBytes());
            outstream.write( ' \n ' );
            outstream.write(mypubkey_exponent.toString().getBytes());            
            outstream.flush();
            outstream.close();
        }
         catch  (IOException closing)
         {
            closing.printStackTrace();
        }
        System.out.println( " 公钥输出到文件: " + Filename);        
        
    }
    
     /**
     * 从文件中导入公钥到内存
     *  @param  Filename
     *  @return
      */
     public  RSAKeyParameters ImportPublicKey(String Filename)
     {
        String infile  =  Filename;
        BufferedInputStream instream  =   null ;
        RSAKeyParameters RSAParam = null ;
         try
         {
            instream  =   new  BufferedInputStream( new  FileInputStream(infile));
        }
         catch  (FileNotFoundException fnf)
         {
            System.err.println( " 公钥文件没有找到 [ " + infile + " ] " );
            System.exit( 1 );
        }
        
        BufferedReader br  =   new  BufferedReader( new  InputStreamReader(instream));
        BigInteger mypubkey_modulus = null ;        
        BigInteger mypubkey_exponent = null ;        
        String readstr = null ;

         try   {
            
            readstr  =  br.readLine();
            
            mypubkey_modulus =   new  BigInteger(readstr);           
            System.out.println( " [ImportPublicKey]mypubkey_modulus= " + mypubkey_modulus.toString());
         
            readstr  =  br.readLine();
            mypubkey_exponent = new  BigInteger(readstr);
            System.out.println( " [ImportPublicKey]mypubkey_exponent= " + mypubkey_exponent);
            
            RSAParam = new  RSAKeyParameters( false ,mypubkey_modulus,mypubkey_exponent);
            
        }   catch  (DataLengthException e)  {
            e.printStackTrace();
        }   catch  (IllegalStateException e)  {
            e.printStackTrace();
        }  
         catch (Exception e)
         {
            e.printStackTrace();
        }         
         return  RSAParam;

    }
    
     /**
     * 输出私钥到指定的文件
     *  @param  Filename
      */
     public   void  ExportPrivateKey(String Filename)
     {
  
        String outfile  =  Filename;
        BufferedOutputStream outstream  =   null ;        

         try
         {
            outstream  =   new  BufferedOutputStream( new  FileOutputStream(outfile));
        }
         catch  (IOException fnf)
         {
            System.err.println( " 输出文件无法创建 [ " + outfile + " ] " );
            System.exit( 1 );
        }         
        
        
        RSAPrivateCrtKeyParameters myprivkey = this .getPrivateKey();
        
        BigInteger myprivkey_modulus = myprivkey.getModulus();
        BigInteger myprivkey_exponent = myprivkey.getExponent();
        BigInteger e = myprivkey.getPublicExponent();   // e is public
        BigInteger dP = myprivkey.getDP();
        BigInteger dQ = myprivkey.getDQ();
        BigInteger p = myprivkey.getP();
        BigInteger q = myprivkey.getQ();
        BigInteger qInv = myprivkey.getQInv();
        

         try
         {
            outstream.write(myprivkey_modulus.toString().getBytes());
            outstream.write( ' \n ' );
            outstream.write(e.toString().getBytes());   
            outstream.write( ' \n ' );
            outstream.write(myprivkey_exponent.toString().getBytes());            
            outstream.write( ' \n ' );
            outstream.write(p.toString().getBytes());   
            outstream.write( ' \n ' );
            outstream.write(q.toString().getBytes());
            outstream.write( ' \n ' );            
            outstream.write(dP.toString().getBytes());   
            outstream.write( ' \n ' );
            outstream.write(dQ.toString().getBytes());   
            outstream.write( ' \n ' );
            outstream.write(qInv.toString().getBytes());   
            outstream.write( ' \n ' );
            
            outstream.flush();
            outstream.close();
        }
         catch  (IOException closing)
         {
            closing.printStackTrace();
        }
        System.out.println( " 私钥输出到文件: " + Filename);        
        
    }
    
     /**
     * 输出私钥到指定的文件，私钥经过密码加密
     * 强烈建议在生产环境中使用此方法而不要使用
     * ExportPrivateKey(String Filename)
     * 
     *  @param  Filename  私钥文件
     *  @param  Password  私钥的保护密码
      */
     public   void  ExportPrivateKeyWithPass(String Filename, String Password)
     {
    
        String outfile  =  Filename;
                
        ByteArrayOutputStream outstream = null ;
        BufferedOutputStream keyoutstream = null ;
         // 借助BlockCipherTool来加密私钥
        BlockCipherTool cipherTool = new  BlockCipherTool();
        
         // 暂时使用DES加密私钥
         // cipherTool.setEngine(new AESEngine());
         // cipherTool.setEngine(new IDEAEngine());
        cipherTool.setEngine( new  DESEngine());
         // cipherTool.setEngine(new BlowfishEngine());
        
         // cipherTool.setKeyLength(64);  // AES　32(Hex)*4=128bit
         // String keyStr="123456789012345678901234567890FF";  // 16进制  128bit AES Key
         // String keyStr="123456789012345678901234567890FF123456789012345678901234567890FF";  // 16进制  256bit AES Key
         // String keyStr="123456789012345678901234567890FF";  // 16进制  128bit IDEA Key
         // String keyStr="0123456789abcdef";  // 16进制  64bit(56) DES Key
         // String keyStr="0123456789ABCDEF";  // 16进制  64bit(56) Blowfish Key
        
        
        outstream  =   new  ByteArrayOutputStream();  
         try
         {
            keyoutstream  =   new  BufferedOutputStream( new  FileOutputStream(outfile));
 
        }
         catch  (Exception fnf)
         {
            System.err.println( " 输出文件无法创建 [ " + outfile + " ] " );
            System.exit( 1 );
        }                 
        
        
        RSAPrivateCrtKeyParameters myprivkey = this .getPrivateKey();
        
        BigInteger myprivkey_modulus = myprivkey.getModulus();
        BigInteger myprivkey_exponent = myprivkey.getExponent();
        BigInteger e = myprivkey.getPublicExponent();   // e is public
        BigInteger dP = myprivkey.getDP();
        BigInteger dQ = myprivkey.getDQ();
        BigInteger p = myprivkey.getP();
        BigInteger q = myprivkey.getQ();
        BigInteger qInv = myprivkey.getQInv();
        

         try
         {
             //  产生正确的私钥流
            outstream.write(myprivkey_modulus.toString().getBytes());
            outstream.write( ' \n ' );
            outstream.write(e.toString().getBytes());   
            outstream.write( ' \n ' );
            outstream.write(myprivkey_exponent.toString().getBytes());            
            outstream.write( ' \n ' );
            outstream.write(p.toString().getBytes());   
            outstream.write( ' \n ' );
            outstream.write(q.toString().getBytes());
            outstream.write( ' \n ' );            
            outstream.write(dP.toString().getBytes());   
            outstream.write( ' \n ' );
            outstream.write(dQ.toString().getBytes());   
            outstream.write( ' \n ' );
            outstream.write(qInv.toString().getBytes());   
            outstream.write( ' \n ' );
            
            
             byte [] privatekey_withtoutpass = outstream.toByteArray();
            
            ByteArrayInputStream keyinstream = new  ByteArrayInputStream(privatekey_withtoutpass);
            
             // 加密私钥
            cipherTool.init( true ,Password);
             // 将outstream转型成keyinstream，将keyinstream执行DES加密
            cipherTool.Encrypt(keyinstream,keyoutstream);
            
            keyinstream.close();
            keyoutstream.flush();
            keyoutstream.close();
            
            
        }
         catch  (IOException closing)
         {
            closing.printStackTrace();
        }
        
        System.out.println( " 私钥经过加密并输出到文件: " + Filename);        
        
    }     

     /**
     * 从某个文件中导入私钥，假定私钥未被加密
     *  @see  ExportPrivateKey(String Filename)
     *  @param  Filename
     *  @return
      */
     public  RSAPrivateCrtKeyParameters ImportPrivateKey(String Filename)
     {
        String infile  =  Filename;
        BufferedInputStream instream  =   null ;
        RSAPrivateCrtKeyParameters RSAPrivParam = null ;
        
         try
         {
            instream  =   new  BufferedInputStream( new  FileInputStream(infile));
        }
         catch  (FileNotFoundException fnf)
         {
            System.err.println( " 私钥文件没有找到 [ " + infile + " ] " );
            System.exit( 1 );
        }
        
        BufferedReader br  =   new  BufferedReader( new  InputStreamReader(instream));
   
        
        BigInteger myprivkey_modulus = null ;
        BigInteger myprivkey_exponent = null ;
        BigInteger e = null ;
        BigInteger p = null ;
        BigInteger q = null ;
        BigInteger dP = null ;
        BigInteger dQ = null ;
        BigInteger qInv = null ;
        
        String readstr = null ;
         try   {
            
            readstr  =  br.readLine();                        
            myprivkey_modulus =   new  BigInteger(readstr);
            readstr  =  br.readLine();
            e =   new  BigInteger(readstr);
            readstr  =  br.readLine();               
            myprivkey_exponent =   new  BigInteger(readstr);
            readstr  =  br.readLine();                                            
            p =   new  BigInteger(readstr);
            readstr  =  br.readLine();                        
            q =   new  BigInteger(readstr);
            readstr  =  br.readLine();                        
            dP =   new  BigInteger(readstr);
            readstr  =  br.readLine();                        
            dQ =   new  BigInteger(readstr);            
            readstr  =  br.readLine();                        
            qInv =   new  BigInteger(readstr);

                      
            RSAPrivParam = new  RSAPrivateCrtKeyParameters(myprivkey_modulus, myprivkey_exponent,
                    e,p,q,dP,dQ,qInv);
            
        }   catch  (DataLengthException ex)  {
            ex.printStackTrace();
        }   catch  (IllegalStateException ex)  {
            ex.printStackTrace();
        }  
         catch (Exception ex)
         {
            ex.printStackTrace();
        }         
         return  RSAPrivParam;

    }
    
     /**
     * 从私钥文件中导入私钥，并用保护密码通过DES解密该私钥
     * 放入内存，该方法跟ExportPrivateKeyWithPass 对应
     * 
     *  @see  ExportPrivateKeyWithPass(String Filename, String Password)
     *  @param  Filename
     *  @param  Password
     *  @return
      */
     public  RSAPrivateCrtKeyParameters ImportPrivateKeyWithPass(String Filename,String Password)
     {
        String infile  =  Filename;
        InputStream instream  =   null ;
        
        ByteArrayInputStream keyinstream  = null ;
        ByteArrayOutputStream keyoutstream  =   new  ByteArrayOutputStream();
        
         // 借助BlockCipherTool来加密私钥
        BlockCipherTool cipherTool = new  BlockCipherTool();
        
         // 暂时使用DES加密私钥
         // cipherTool.setEngine(new AESEngine());
         // cipherTool.setEngine(new IDEAEngine());
        cipherTool.setEngine( new  DESEngine());
         // cipherTool.setEngine(new BlowfishEngine());    
        
         // cipherTool.setKeyLength(64);  // AES　32(Hex)*4=128bit
         // String keyStr="123456789012345678901234567890FF";  // 16进制  128bit AES Key
         // String keyStr="123456789012345678901234567890FF123456789012345678901234567890FF";  // 16进制  256bit AES Key
         // String keyStr="123456789012345678901234567890FF";  // 16进制  128bit IDEA Key
         // String keyStr="0123456789abcdef";  // 16进制  64bit(56) DES Key
         // String keyStr="0123456789ABCDEF";  // 16进制  64bit(56) Blowfish Key
        
        
        RSAPrivateCrtKeyParameters RSAPrivParam = null ;
         try
         {
            instream  =   new  BufferedInputStream( new  FileInputStream(infile));                    
        }
         catch  (FileNotFoundException fnf)
         {
            System.err.println( " 私钥文件没有找到 [ " + infile + " ] " );
            System.exit( 1 );
        }
        
        cipherTool.init( false ,Password);

         // keyinstream-->ByteArrayOutputStream，将keyinstream执行DES加密
        cipherTool.Decrypt(instream,keyoutstream);
        
         byte [] privatekey_withtoutpass = keyoutstream.toByteArray();
        
        keyinstream = new  ByteArrayInputStream(privatekey_withtoutpass);        
        
        
        
        BigInteger myprivkey_modulus = null ;
        BigInteger myprivkey_exponent = null ;
        BigInteger e = null ;
        BigInteger p = null ;
        BigInteger q = null ;
        BigInteger dP = null ;
        BigInteger dQ = null ;
        BigInteger qInv = null ;
        
        String readstr = null ;
         try   {
             
            BufferedReader br  =   new  BufferedReader( new  InputStreamReader(keyinstream));
                    
            readstr  =  br.readLine();                        
            myprivkey_modulus =   new  BigInteger(readstr);
            readstr  =  br.readLine();
            e =   new  BigInteger(readstr);
            readstr  =  br.readLine();               
            myprivkey_exponent =   new  BigInteger(readstr);
            readstr  =  br.readLine();                                            
            p =   new  BigInteger(readstr);
            readstr  =  br.readLine();                        
            q =   new  BigInteger(readstr);
            readstr  =  br.readLine();                        
            dP =   new  BigInteger(readstr);
            readstr  =  br.readLine();                        
            dQ =   new  BigInteger(readstr);            
            readstr  =  br.readLine();                        
            qInv =   new  BigInteger(readstr);

                      
            RSAPrivParam = new  RSAPrivateCrtKeyParameters(myprivkey_modulus, myprivkey_exponent,
                    e,p,q,dP,dQ,qInv);
            
            
            keyinstream.close();
            keyoutstream.flush();
            keyoutstream.close();
            
        }   catch  (DataLengthException ex)  {
            ex.printStackTrace();
        }   catch  (IllegalStateException ex)  {
            ex.printStackTrace();
        }  
         catch (Exception ex)
         {
            ex.printStackTrace();
        }         
        
         return  RSAPrivParam;

    }

     /**
     * 为一个Block清0
     *  @param  block
      */
     public   void  reset( byte [] block)
     {
         for ( int  i = 0 ;i < block.length;i ++ )
            block[i] = ( byte ) 0 ;
    }
    
     /**
     * 将某个Block自off后的字节清0
     *  @param  block
     *  @param  off
      */
     public   void  padding( byte [] block,  int  off)
     {        
         for ( int  i = off;i < block.length;i ++ )
            block[i] = ( byte ) 0 ;
    }
    
    
}

posted on 2006-11-17 22:30 david.turing 阅读(1867) 评论(0)  编辑  收藏 所属分类: CryptoAPI


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