in.s8.rsa.impl.DecryptImpl Maven / Gradle / Ivy

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package in.s8.rsa.impl;

import in.s8.rsa.constant.S8Constant;
import in.s8.rsa.implService.DecryptService;
import org.springframework.stereotype.Component;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;

/**
 * Decryption Implementation
 * Created by Sourabh_Sethi on 5/17/2016.
 */

@Component("decryptImpl")
public class DecryptImpl implements DecryptService {

    /**
     * decrypt the data Using Private Key.
     *
     * @param text
     * @param key
     * @return
     * @throws NoSuchPaddingException
     * @throws NoSuchAlgorithmException
     * @throws InvalidKeyException
     * @throws BadPaddingException
     * @throws IllegalBlockSizeException
     */
    public String decrypt(byte[] text, PrivateKey key) throws NoSuchPaddingException, NoSuchAlgorithmException,
            InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        byte[] dectyptedText = null;

        // get an RSA cipher object and print the provider
        final Cipher cipher = Cipher.getInstance(S8Constant.ALGORITHM);

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

        return new String(dectyptedText);
    }
}