Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.security.InvalidKeyException;

import java.security.KeyFactory;

import java.security.NoSuchAlgorithmException;

import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;

import java.security.spec.RSAPublicKeySpec;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;

import android.util.Log;

public class Main {
    private static final String TAG = "MyKeyUtils";

    public static byte[] encryptMsg(String msg, RSAPublicKeySpec pubKeySpec) {
        if (msg != null && pubKeySpec != null && !msg.isEmpty()) {
            try {
                Log.w(TAG, "msg is: " + msg + " with length " + msg.length());
                KeyFactory fact = KeyFactory.getInstance("RSA");

                PublicKey pubKey = fact.generatePublic(pubKeySpec);

                // TODO encrypt the message and send it
                // Cipher cipher = Cipher.getInstance("RSA/None/NoPadding");
                Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
                // Cipher cipher =
                // Cipher.getInstance("RSA/None/OAEPWithSHA1AndMGF1Padding",
                // "BC");
                cipher.init(Cipher.ENCRYPT_MODE, pubKey);
                Log.d(TAG, "cipher block size is " + cipher.getBlockSize());
                byte[] msgByteArray = msg.getBytes();
                byte[] cipherData = new byte[cipher.getOutputSize(msgByteArray.length)];
                cipherData = cipher.doFinal(msgByteArray);
                Log.d(TAG, "output size is " + cipher.getOutputSize(msgByteArray.length));
                Log.d(TAG, "is the measurement already broken into chunks here? " + (new String(cipherData)));
                return cipherData;

            } catch (NoSuchAlgorithmException e) {
                Log.e(TAG, "RSA algorithm not available", e);
            } catch (InvalidKeySpecException e) {
                Log.e(TAG, "", e);
            } catch (NoSuchPaddingException e) {
                Log.e(TAG, "", e);
            } catch (InvalidKeyException e) {
                Log.e(TAG, "", e);
            } catch (BadPaddingException e) {
                Log.e(TAG, "", e);
            } catch (IllegalBlockSizeException e) {
                Log.e(TAG, "", e);
            } catch (Exception e) {
                Log.e(TAG, "", e);
            } /*
               * catch (NoSuchProviderException e) { Log.e(TAG, "", e); }
               */
        }
        return null;
    }
}