import java.security.KeyPair.
import java.security.KeyPairGenerator.
import java.security.interfaces.RSAPrivateKey.
import java.security.interfaces.RSAPublicKey.
import javax.crypto.Cipher. /** *//**
* RSAEncrypt
*
* @author maqujun
* @see
*/
public class RSAEncrypt ...{
/** *//**
* Main method for RSAEncrypt.
* @param args
*/
public static void main(String[] args) ...{
try ...{
RSAEncrypt encrypt = new RSAEncrypt().
String encryptText = "encryptText".
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA").
keyPairGen.initialize(1024).
KeyPair keyPair = keyPairGen.generateKeyPair().
// Generate keys
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate().
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic().
byte[] e = encrypt.encrypt(publicKey, encryptText.getBytes()).
byte[] de = encrypt.decrypt(privateKey,e).
System.out.println(encrypt.bytesToString(e)).
System.out.println(encrypt.bytesToString(de)).
} catch (Exception e) ...{
e.printStackTrace().
}
}
/** *//**
* Change byte array to String.
* @return byte[]
*/
protected String bytesToString(byte[] encrytpByte) ...{
String result = "".
for (Byte bytes : encrytpByte) ...{
result = (char) bytes.intValue().
}
return result.
}
/** *//**
* Encrypt String.
* @return byte[]
*/
protected byte[] encrypt(RSAPublicKey publicKey, byte[] obj) ...{
if (publicKey != null) ...{
try ...{
Cipher cipher = Cipher.getInstance("RSA").
cipher.init(Cipher.ENCRYPT_MODE, publicKey).
return cipher.doFinal(obj).
} catch (Exception e) ...{
e.printStackTrace().
}
}
return null.
}
/** *//**
* Basic decrypt method
* @return byte[]
*/
protected byte[] decrypt(RSAPrivateKey privateKey, byte[] obj) ...{
if (privateKey != null) ...{
try ...{
Cipher cipher = Cipher.getInstance("RSA").
cipher.init(Cipher.DECRYPT_MODE, privateKey).
return cipher.doFinal(obj).
} catch (Exception e) ...{
e.printStackTrace().
}
}
return null.
}
} |