Decrypts a message encrypted with the user's public key by using their private key - Android java.security

Android examples for java.security:Key

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Description

Decrypts a message encrypted with the user's public key by using their private key

Demo Code


//package com.java2s;

import android.util.Log;
import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;

public class Main {
    /**/*from  w  w  w  .j  a  v a2 s.  c om*/
     *
     * Decrypts a message encrypted with the user's public key by using their private key
     * @see java.security.interfaces.RSAPrivateKey
     *
     * @param encBarr
     * @param privateKey
     * @return
     * @throws NoSuchAlgorithmException
     * @throws NoSuchPaddingException
     * @throws InvalidKeyException
     * @throws IllegalBlockSizeException
     * @throws NoSuchProviderException
     */
    public static String RSADecrypt(final byte[] encBarr,
            PrivateKey privateKey) throws NoSuchAlgorithmException,
            NoSuchPaddingException, InvalidKeyException,
            IllegalBlockSizeException, NoSuchProviderException {
        String res = null;

        Cipher cipher1 = Cipher.getInstance("RSA/ECB/PKCS1Padding",
                "AndroidOpenSSL");
        cipher1.init(Cipher.DECRYPT_MODE, privateKey);

        byte[] decBarr = new byte[0];
        try {
            decBarr = cipher1.doFinal(encBarr);
        } catch (BadPaddingException e) {
            Log.i("myApp", "BadPadding");
            e.printStackTrace();
        }

        if (decBarr != null)
            res = new String(decBarr);

        return res;
    }
}

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