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POhow to encrypt decrept public key
 

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    <p>this is my login page code below and i also find a RSA PUBLIC PRIVITE KEY on google how do i insert this code in my code? can anyone help me i found rsa code formthis url <a href="http://xtrace.blogspot.com/search/label/RSA" rel="nofollow">http://xtrace.blogspot.com/search/label/RSA</a></p> <pre><code> public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.agapplogin); TextView lblMobileNo = (TextView)findViewById(R.id.lblMobileNo); lblMobileNo.setTextColor(getResources().getColor(R.color.text_color_red)); mobile = (EditText)findViewById(R.id.txtMobileNo); TextView lblPinNo = (TextView)findViewById(R.id.lblPinNo); lblPinNo.setTextColor(getResources().getColor(R.color.text_color_red)); pin = (EditText)findViewById(R.id.txtPinNo); btnLogin = (Button)findViewById(R.id.btnLogin); btnClear = (Button)findViewById(R.id.btnClear); btnLogin.setOnClickListener(new OnClickListener() { public void onClick(View view) { postLoginData(); } }); ;} public void postLoginData() { Intent i = new Intent(this.getApplicationContext(),new.class); Bundle bundle = new Bundle(); bundle.putString("mno", mobile.getText().toString()); bundle.putString("pinno", pin.getText().toString()); i.putExtras(bundle); startActivity(i); } } ///this is RSA code which i found import java.io.BufferedOutputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectOutputStream; import java.math.BigInteger; import java.security.Key; import java.security.KeyFactory; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.NoSuchAlgorithmException; import java.security.spec.RSAPrivateKeySpec; import java.security.spec.RSAPublicKeySpec; /** * This class generates key pair and saves in file in current directory * * @author amit * */ public class RSAKeyGenerator { public void generateKeyPair(String publicKeyFileName, String privateKeyFileName) { KeyPairGenerator kpg = null; try { kpg = KeyPairGenerator.getInstance("RSA"); } catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block e.printStackTrace(); } kpg.initialize(2048); KeyPair kp = kpg.genKeyPair(); Key publicKey = kp.getPublic(); Key privateKey = kp.getPrivate(); try { KeyFactory fact = KeyFactory.getInstance("RSA"); RSAPublicKeySpec pub = fact.getKeySpec(publicKey, RSAPublicKeySpec.class); RSAPrivateKeySpec priv = fact.getKeySpec(privateKey, RSAPrivateKeySpec.class); saveToFile(publicKeyFileName, pub.getModulus(), pub.getPublicExponent()); System.out.println("public key saved"); saveToFile(privateKeyFileName, priv.getModulus(), priv.getPrivateExponent()); System.out.println("private key saved"); } catch (Exception e) { System.out.println("error "); } } private void saveToFile(String fileName, BigInteger mod, BigInteger exp) throws IOException { ObjectOutputStream oout = new ObjectOutputStream( new BufferedOutputStream(new FileOutputStream(fileName))); try { oout.writeObject(mod); oout.writeObject(exp); } catch (Exception e) { throw new IOException("Unexpected error", e); } finally { oout.close(); } } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub RSAKeyGenerator t = new RSAKeyGenerator(); t.generateKeyPair("public.key", "private.key"); } } import javax.crypto.Cipher; public class RSAEncDec { private PublicKey readPublicKeyFromFile(String fileloc) throws IOException { InputStream in = new FileInputStream(new File(fileloc)); ObjectInputStream oin = new ObjectInputStream(new BufferedInputStream( in)); try { BigInteger m = (BigInteger) oin.readObject(); BigInteger e = (BigInteger) oin.readObject(); RSAPublicKeySpec keySpec = new RSAPublicKeySpec(m, e); KeyFactory fact = KeyFactory.getInstance("RSA"); PublicKey pubKey = fact.generatePublic(keySpec); return pubKey; } catch (Exception e) { throw new RuntimeException("Spurious serialisation error", e); } finally { oin.close(); } } private PrivateKey readPrivateKeyFromFile(String fileLoc) throws IOException { InputStream in = new FileInputStream(new File(fileLoc)); ObjectInputStream oin = new ObjectInputStream(new BufferedInputStream( in)); try { BigInteger m = (BigInteger) oin.readObject(); BigInteger e = (BigInteger) oin.readObject(); RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec(m, e); KeyFactory fact = KeyFactory.getInstance("RSA"); PrivateKey prvKey = fact.generatePrivate(keySpec); return prvKey; } catch (Exception e) { throw new RuntimeException("Spurious serialisation error", e); } finally { oin.close(); } } public byte[] rsaEncrypt(byte[] data, String fileLoc) { try { PublicKey pubKey = readPublicKeyFromFile(fileLoc); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, pubKey); byte[] cipherData = cipher.doFinal(data); return cipherData; } catch (Exception e) { System.out.println("some thing went wrong"); } return null; } public byte[] rsaDecrypt(byte[] data, String fileLoc) { try { PrivateKey pubKey = readPrivateKeyFromFile(fileLoc); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE, pubKey); byte[] cipherData = cipher.doFinal(data); return cipherData; } catch (Exception e) { System.out.println("some thing went wrong"); } return null; } /* * string * * @param data (normal string) * * @return */ public String encrypt(String data, String fileLoc) { byte[] enc = rsaEncrypt(data.getBytes(), fileLoc); return Base64.encode(enc); } /** * return the normal string * * @param data * (base64 encoded string) * @return * @throws Base64DecodingException */ public String decrypt(String data, String fileLoc) throws Base64DecodingException { byte[] enc = Base64.decode(data); byte[] decryptedData = rsaDecrypt(enc, fileLoc); return new String(decryptedData); } /** * * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub RSAEncDec obj = new RSAEncDec(); String enc = obj.encrypt("hello world", "./public.key"); System.out.println(enc); String dat = null; try { dat = obj.decrypt(enc, "./private.key"); } catch (Base64DecodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println(dat); } } </code></pre>
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