get RSA Private Key - Java Security

Java examples for Security:RSA

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Description

get RSA Private Key

Demo Code


//package com.java2s;

import java.math.BigInteger;
import java.security.KeyFactory;

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

import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.RSAPublicKeySpec;

public class Main {
    private static String RSA = "RSA";

    public static PrivateKey getPrivateKey(byte[] keyBytes)
            throws NoSuchAlgorithmException, InvalidKeySpecException {
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(RSA);
        PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
        return privateKey;
    }/*from w  w  w  .j  a v  a  2  s .  co m*/

    public static PrivateKey getPrivateKey(String modulus,
            String privateExponent) throws NoSuchAlgorithmException,
            InvalidKeySpecException {
        BigInteger bigIntModulus = new BigInteger(modulus);
        BigInteger bigIntPrivateExponent = new BigInteger(privateExponent);
        RSAPublicKeySpec keySpec = new RSAPublicKeySpec(bigIntModulus,
                bigIntPrivateExponent);
        KeyFactory keyFactory = KeyFactory.getInstance(RSA);
        PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
        return privateKey;
    }
}

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