Decrypt text using RSA private key. - Java Security

Java examples for Security:RSA

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Description

Decrypt text using RSA private key.

Demo Code

/**//from  w  ww  .j  a v  a  2s.co  m
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the License). You may not use this file except in
 * compliance with the License.
 * You may obtain a copy of the License at

 *  http://www.zhuangxulin.com/licenses/LICENSE-1.0
          
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 */
//package com.java2s;

import java.security.PrivateKey;

import javax.crypto.Cipher;

public class Main {
    /**
     * String to hold name of the encryption algorithm.
     */
    public static final String ALGORITHM = "RSA";

    /**
     * Decrypt text using private key.
     * 
     * @param text
     *            :encrypted text
     * @param key
     *            :The private key
     * @return plain text
     * @throws java.lang.Exception
     */
    public static String decrypt(byte[] text, PrivateKey key) {
        byte[] dectyptedText = null;
        try {
            // get an RSA cipher object and print the provider
            final Cipher cipher = Cipher.getInstance(ALGORITHM);

            // decrypt the text using the private key
            cipher.init(Cipher.DECRYPT_MODE, key);
            dectyptedText = cipher.doFinal(text);

        } catch (Exception ex) {
            ex.printStackTrace();
        }

        return new String(dectyptedText);
    }
}

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