Revisions to RSA Encryption Decryption in Android

Tided formatting a bit

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edit approved Jan 28, 2016 at 10:45

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I am implementing a demo for RSA Encryption and Decryption in Android. I can Perform Encryption very well.But, but In Decryption I gotget an Exception..>>java.security.InvalidKeyException: unknown key type passed to RSA

Please Review my code and Help me..

Thanks in Advance.>>java.security.InvalidKeyException: unknown key type passed to RSA.

    KeyPairGenerator kpg;
    KeyPair kp;
    PublicKey publicKey;
    PrivateKey privateKey;
    byte [] encryptedBytes,decryptedBytes;
    Cipher cipher,cipher1;
    String encrypted,decrypted;

    public String RSAEncrypt (final String plain) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {
        kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(1024);
        kp = kpg.genKeyPair();
        publicKey = kp.getPublic();
        privateKey = kp.getPrivate();
        
        cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        encryptedBytes = cipher.doFinal(plain.getBytes());
        encrypted = new String(encryptedBytes);
        System.out.println("EEncrypted?????"+encrypted);
        return encrypted;

    }
    
    public String RSADecrypt (final String result) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {

        cipher1=Cipher.getInstance("RSA");
        cipher1.init(Cipher.DECRYPT_MODE, privateKey);
        decryptedBytes = cipher1.doFinal(result.getBytes());
        decrypted = new String(decryptedBytes);
        System.out.println("DDecrypted?????"+decrypted);
        return decrypted;

    }


 
 And I am calling Function from Here..

And I am calling the function from here:

encrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                
                    try
                    {
                        
                        RSAEncrypt rsaencrypt=new RSAEncrypt();
                        rsaencrypt.RSAEncrypt(name);
                        
                        result=rsaencrypt.RSAEncrypt(name);
                        Toast.makeText(getBaseContext(), result.toString(),Toast.LENGTH_SHORT).show();

                        System.out.println("Result:"+result);
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show();
                    } 
                
            }
        });
        
        decrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                
                {
                    try
                    {
                        RSAEncrypt rsadecrypt=new RSAEncrypt();
                        
                        rsadecrypt.RSADecrypt(result);
                        
                        ans=rsadecrypt.RSADecrypt(result);
                        System.out.println("Result is"+ans);
                        Toast.makeText(getBaseContext(), ans.toString(),Toast.LENGTH_LONG).show();
                        
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show();
                        System.out.println("Exception is>>"+e);
                    } 
                
            }
        });

I am implementing a demo for RSA Encryption and Decryption in Android. I can Perform Encryption very well.But In Decryption I got an Exception..>>java.security.InvalidKeyException: unknown key type passed to RSA

Please Review my code and Help me..

Thanks in Advance..

    KeyPairGenerator kpg;
    KeyPair kp;
    PublicKey publicKey;
    PrivateKey privateKey;
    byte [] encryptedBytes,decryptedBytes;
    Cipher cipher,cipher1;
    String encrypted,decrypted;

    public String RSAEncrypt (final String plain) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {
        kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(1024);
        kp = kpg.genKeyPair();
        publicKey = kp.getPublic();
        privateKey = kp.getPrivate();
        
        cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        encryptedBytes = cipher.doFinal(plain.getBytes());
        encrypted = new String(encryptedBytes);
        System.out.println("EEncrypted?????"+encrypted);
        return encrypted;

    }
    
    public String RSADecrypt (final String result) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {

        cipher1=Cipher.getInstance("RSA");
        cipher1.init(Cipher.DECRYPT_MODE, privateKey);
        decryptedBytes = cipher1.doFinal(result.getBytes());
        decrypted = new String(decryptedBytes);
        System.out.println("DDecrypted?????"+decrypted);
        return decrypted;

    }


 
 And I am calling Function from Here..

encrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                
                    try
                    {
                        
                        RSAEncrypt rsaencrypt=new RSAEncrypt();
                        rsaencrypt.RSAEncrypt(name);
                        
                        result=rsaencrypt.RSAEncrypt(name);
                        Toast.makeText(getBaseContext(), result.toString(),Toast.LENGTH_SHORT).show();

                        System.out.println("Result:"+result);
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show();
                    } 
                
            }
        });
        
        decrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                
                {
                    try
                    {
                        RSAEncrypt rsadecrypt=new RSAEncrypt();
                        
                        rsadecrypt.RSADecrypt(result);
                        
                        ans=rsadecrypt.RSADecrypt(result);
                        System.out.println("Result is"+ans);
                        Toast.makeText(getBaseContext(), ans.toString(),Toast.LENGTH_LONG).show();
                        
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show();
                        System.out.println("Exception is>>"+e);
                    } 
                
            }
        });

I am implementing a demo for RSA Encryption and Decryption in Android. I can Perform Encryption very well, but In Decryption I get an Exception: >>java.security.InvalidKeyException: unknown key type passed to RSA.

    KeyPairGenerator kpg;
    KeyPair kp;
    PublicKey publicKey;
    PrivateKey privateKey;
    byte [] encryptedBytes,decryptedBytes;
    Cipher cipher,cipher1;
    String encrypted,decrypted;

    public String RSAEncrypt (final String plain) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {
        kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(1024);
        kp = kpg.genKeyPair();
        publicKey = kp.getPublic();
        privateKey = kp.getPrivate();
        
        cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        encryptedBytes = cipher.doFinal(plain.getBytes());
        encrypted = new String(encryptedBytes);
        System.out.println("EEncrypted?????"+encrypted);
        return encrypted;

    }
    
    public String RSADecrypt (final String result) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {

        cipher1=Cipher.getInstance("RSA");
        cipher1.init(Cipher.DECRYPT_MODE, privateKey);
        decryptedBytes = cipher1.doFinal(result.getBytes());
        decrypted = new String(decryptedBytes);
        System.out.println("DDecrypted?????"+decrypted);
        return decrypted;

    }

And I am calling the function from here:

encrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                    try
                    {
                        RSAEncrypt rsaencrypt=new RSAEncrypt();
                        rsaencrypt.RSAEncrypt(name);
                        
                        result=rsaencrypt.RSAEncrypt(name);
                        Toast.makeText(getBaseContext(), result.toString(),Toast.LENGTH_SHORT).show();

                        System.out.println("Result:"+result);
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show();
                    }
            }
        });
        
        decrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                {
                    try
                    {
                        RSAEncrypt rsadecrypt=new RSAEncrypt();
                        
                        rsadecrypt.RSADecrypt(result);
                        
                        ans=rsadecrypt.RSADecrypt(result);
                        System.out.println("Result is"+ans);
                        Toast.makeText(getBaseContext(), ans.toString(),Toast.LENGTH_LONG).show();
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show();
                        System.out.println("Exception is>>"+e);
                    }
            }
        });

added 999 characters in body

Source Link

edited Sep 18, 2012 at 10:38

Riddhi Barbhaya

1.2k
1
11
19

I am implementing a demo for RSA Encryption and Decryption in Android. I can Perform Encryption very well.But In Decryption I got an Exception..>> java>>java.langsecurity.ArrayIndexOutOfBoundExceptionInvalidKeyException:too much Data for unknown key type passed to RSA Block

    KeyPairGenerator kpg;
    KeyPair kp;
    PublicKey publicKey;
    PrivateKey privateKey;
    byte [] encryptedBytes,decryptedBytes;
    Cipher cipher,cipher1;
    String encrypted,decrypted;

    public String RSAEncrypt (final String plain) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(1024);
        kpg.initialize(1024);
        KeyPair kp = kpg.genKeyPair();
        PublicKey publicKey = kp.getPublic();
        PrivateKey privateKey = kp.getPrivate();
        
        byte [] encryptedBytes;
        Cipher cipher = Cipher.getInstance("RSA");
       
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        encryptedBytes = cipher.doFinal(plain.getBytes());
        String encrypted = new String(encryptedBytes);
        System.out.println("EEncrypted?????"+encrypted);
       
  return encrypted;

    byte [] decryptedBytes;}
     
    Cipherpublic cipher1String =RSADecrypt Cipher.getInstance("RSA"final String result); throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {

        cipher1=Cipher.getInstance("RSA");
        cipher1.init(Cipher.DECRYPT_MODE, publicKeyprivateKey);
        decryptedBytes = cipher1.doFinal(encryptedresult.getBytes());
//        decryptedBytes=cipher.doFinal(hex)
        String decrypted = new String(decryptedBytes);
        System.out.println("DDecrypted?????"+decrypted);
        return decrypted;

    }
  


 And I 
 am calling Function from Here..

And I am calling this function from...

 
encrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                
                    try
                    {
                        
                        RSAEncrypt rsaencrypt=new RSAEncrypt();
                        rsaencrypt.RSAEncrypt(name);
                        
                        result=rsaencrypt.RSAEncrypt(name);
                        Toast.makeText(getBaseContext(), result.toString(),Toast.LENGTH_SHORT).show();

                        System.out.println("Result:"+result);
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_SHORTLENGTH_LONG).show();
                    } 
                
            }
        });
        
        decrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                
                {
                    try
                    {
                        RSAEncrypt rsadecrypt=new RSAEncrypt();
                        
                        rsadecrypt.RSADecrypt(result);
                        
                        ans=rsadecrypt.RSADecrypt(result);
                        System.out.println("Result is"+ans);
                        Toast.makeText(getBaseContext(), ans.toString(),Toast.LENGTH_LONG).show();
                        
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show();
                        System.out.println("Exception is>>"+e);
                    } 
                
            }
        });

I am implementing a demo for RSA Encryption and Decryption in Android. I can Perform Encryption very well.But In Decryption I got an Exception..>> java.lang.ArrayIndexOutOfBoundException:too much Data for RSA Block

public String RSAEncrypt (final String plain) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(1024);
        kpg.initialize(1024);
        KeyPair kp = kpg.genKeyPair();
        PublicKey publicKey = kp.getPublic();
        PrivateKey privateKey = kp.getPrivate();
        
        byte [] encryptedBytes;
        Cipher cipher = Cipher.getInstance("RSA");
       
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        encryptedBytes = cipher.doFinal(plain.getBytes());
        String encrypted = new String(encryptedBytes);
        System.out.println("EEncrypted?????"+encrypted);
       
 

    byte [] decryptedBytes;
        Cipher cipher1 = Cipher.getInstance("RSA");
       
        cipher1.init(Cipher.DECRYPT_MODE, publicKey);
        decryptedBytes = cipher1.doFinal(encrypted.getBytes());
//        decryptedBytes=cipher.doFinal(hex)
        String decrypted = new String(decryptedBytes);
        System.out.println("DDecrypted?????"+decrypted);
        return decrypted;

    }

And I am calling this function from...

encrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                            try
                    {
                        
                        RSAEncrypt rsaencrypt=new RSAEncrypt();
                        rsaencrypt.RSAEncrypt(name);
                        
                        result=rsaencrypt.RSAEncrypt(name);
                        Toast.makeText(getBaseContext(), result.toString(),Toast.LENGTH_SHORT).show();

                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_SHORT).show();
                    } 
                }
            
        });

I am implementing a demo for RSA Encryption and Decryption in Android. I can Perform Encryption very well.But In Decryption I got an Exception..>>java.security.InvalidKeyException: unknown key type passed to RSA

    KeyPairGenerator kpg;
    KeyPair kp;
    PublicKey publicKey;
    PrivateKey privateKey;
    byte [] encryptedBytes,decryptedBytes;
    Cipher cipher,cipher1;
    String encrypted,decrypted;

    public String RSAEncrypt (final String plain) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {
        kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(1024);
        kp = kpg.genKeyPair();
        publicKey = kp.getPublic();
        privateKey = kp.getPrivate();
        
        cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        encryptedBytes = cipher.doFinal(plain.getBytes());
        encrypted = new String(encryptedBytes);
        System.out.println("EEncrypted?????"+encrypted);
        return encrypted;

    }
     
    public String RSADecrypt (final String result) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {

        cipher1=Cipher.getInstance("RSA");
        cipher1.init(Cipher.DECRYPT_MODE, privateKey);
        decryptedBytes = cipher1.doFinal(result.getBytes());
        decrypted = new String(decryptedBytes);
        System.out.println("DDecrypted?????"+decrypted);
        return decrypted;

    }
 


 And I am calling Function from Here..
 
encrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                
                    try
                    {
                        
                        RSAEncrypt rsaencrypt=new RSAEncrypt();
                        rsaencrypt.RSAEncrypt(name);
                        
                        result=rsaencrypt.RSAEncrypt(name);
                        Toast.makeText(getBaseContext(), result.toString(),Toast.LENGTH_SHORT).show();

                        System.out.println("Result:"+result);
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show();
                    } 
                
            }
        });
        
        decrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                
                {
                    try
                    {
                        RSAEncrypt rsadecrypt=new RSAEncrypt();
                        
                        rsadecrypt.RSADecrypt(result);
                        
                        ans=rsadecrypt.RSADecrypt(result);
                        System.out.println("Result is"+ans);
                        Toast.makeText(getBaseContext(), ans.toString(),Toast.LENGTH_LONG).show();
                        
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show();
                        System.out.println("Exception is>>"+e);
                    } 
                
            }
        });

deleted 1235 characters in body

Source Link

edited Sep 18, 2012 at 9:08

Riddhi Barbhaya

1.2k
1
11
19

public String RSAEncrypt (final String plain) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(1024);
        kpg.initialize(1024);
        KeyPair kp = kpg.genKeyPair();
        PublicKey publicKey = kp.getPublic();
        PrivateKey privateKey = kp.getPrivate();
        
        byte [] encryptedBytes;
        Cipher cipher = Cipher.getInstance("RSA");
       
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        encryptedBytes = cipher.doFinal(plain.getBytes());
        String encrypted = new String(encryptedBytes);
        System.out.println("EEncrypted?????"+encrypted);
        return encrypted;

    }
    
    public String RSADecrypt (final String result) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(1024);
        KeyPair kp = kpg.genKeyPair();
        PublicKey publicKey = kp.getPublic();
        PrivateKey privateKey = kp.getPrivate();
        
        byte [] decryptedBytes;
        Cipher cipher1 = Cipher.getInstance("RSA");
       
        cipher1.init(Cipher.DECRYPT_MODE, publicKey);
        decryptedBytes = cipher1.doFinal(resultencrypted.getBytes());
//        decryptedBytes=cipher.doFinal(hex)
        String decrypted = new String(decryptedBytes);
        System.out.println("DDecrypted?????"+decrypted);
        return decrypted;

    }

encrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                            try
                    {
                        
                        RSAEncrypt rsaencrypt=new RSAEncrypt();
                        rsaencrypt.RSAEncrypt(name);
                        
                        result=rsaencrypt.RSAEncrypt(name);
                        Toast.makeText(getBaseContext(), result.toString(),Toast.LENGTH_SHORT).show();

                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_SHORT).show();
                    } 
                }
            
        });

decrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                                    try
                    {
                        RSAEncrypt rsadecrypt=new RSAEncrypt();
                        
                        rsadecrypt.RSADecrypt(result);
                        
                        ans=rsadecrypt.RSADecrypt(result);
                        System.out.println("Result is"+ans);
                        Toast.makeText(getBaseContext(), ans.toString(),Toast.LENGTH_SHORT).show();
                        
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show();
                        System.out.println("Exception is>>"+e);
                    } 
                }
            
        });

public String RSAEncrypt (final String plain) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(1024);
        kpg.initialize(1024);
        KeyPair kp = kpg.genKeyPair();
        PublicKey publicKey = kp.getPublic();
        PrivateKey privateKey = kp.getPrivate();
        
        byte [] encryptedBytes;
        Cipher cipher = Cipher.getInstance("RSA");
       
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        encryptedBytes = cipher.doFinal(plain.getBytes());
        String encrypted = new String(encryptedBytes);
        System.out.println("EEncrypted?????"+encrypted);
        return encrypted;

    }
    
    public String RSADecrypt (final String result) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(1024);
        KeyPair kp = kpg.genKeyPair();
        PublicKey publicKey = kp.getPublic();
        PrivateKey privateKey = kp.getPrivate();
        
        byte [] decryptedBytes;
        Cipher cipher1 = Cipher.getInstance("RSA");
       
        cipher1.init(Cipher.DECRYPT_MODE, publicKey);
        decryptedBytes = cipher1.doFinal(result.getBytes());
//      decryptedBytes=cipher.doFinal(hex)
        String decrypted = new String(decryptedBytes);
        System.out.println("DDecrypted?????"+decrypted);
        return decrypted;

    }

encrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                            try
                    {
                        
                        RSAEncrypt rsaencrypt=new RSAEncrypt();
                        rsaencrypt.RSAEncrypt(name);
                        
                        result=rsaencrypt.RSAEncrypt(name);
                        Toast.makeText(getBaseContext(), result.toString(),Toast.LENGTH_SHORT).show();

                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_SHORT).show();
                    } 
                }
            
        });

decrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                                    try
                    {
                        RSAEncrypt rsadecrypt=new RSAEncrypt();
                        
                        rsadecrypt.RSADecrypt(result);
                        
                        ans=rsadecrypt.RSADecrypt(result);
                        System.out.println("Result is"+ans);
                        Toast.makeText(getBaseContext(), ans.toString(),Toast.LENGTH_SHORT).show();
                        
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show();
                        System.out.println("Exception is>>"+e);
                    } 
                }
            
        });

public String RSAEncrypt (final String plain) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException 
    {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(1024);
        kpg.initialize(1024);
        KeyPair kp = kpg.genKeyPair();
        PublicKey publicKey = kp.getPublic();
        PrivateKey privateKey = kp.getPrivate();
        
        byte [] encryptedBytes;
        Cipher cipher = Cipher.getInstance("RSA");
       
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        encryptedBytes = cipher.doFinal(plain.getBytes());
        String encrypted = new String(encryptedBytes);
        System.out.println("EEncrypted?????"+encrypted);
       


    byte [] decryptedBytes;
        Cipher cipher1 = Cipher.getInstance("RSA");
       
        cipher1.init(Cipher.DECRYPT_MODE, publicKey);
        decryptedBytes = cipher1.doFinal(encrypted.getBytes());
//        decryptedBytes=cipher.doFinal(hex)
        String decrypted = new String(decryptedBytes);
        System.out.println("DDecrypted?????"+decrypted);
        return decrypted;

    }

encrypt.setOnClickListener(new OnClickListener()
        { 
            public void onClick(View arg0) 
            {
                            try
                    {
                        
                        RSAEncrypt rsaencrypt=new RSAEncrypt();
                        rsaencrypt.RSAEncrypt(name);
                        
                        result=rsaencrypt.RSAEncrypt(name);
                        Toast.makeText(getBaseContext(), result.toString(),Toast.LENGTH_SHORT).show();

                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                        Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_SHORT).show();
                    } 
                }
            
        });

added 62 characters in body

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edited Sep 18, 2012 at 8:58

Riddhi Barbhaya

1.2k
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11
19

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I edited code for look code better

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edited Sep 18, 2012 at 7:14

Riddhi Barbhaya

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asked Sep 18, 2012 at 7:08

Riddhi Barbhaya

1.2k
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