get RSA Public Key - Java Security

Java examples for Security:RSA

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Description

get RSA Public Key

Demo Code


//package com.java2s;

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

import java.security.NoSuchAlgorithmException;

import java.security.PublicKey;

import java.security.spec.InvalidKeySpecException;

import java.security.spec.RSAPublicKeySpec;
import java.security.spec.X509EncodedKeySpec;

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

    public static PublicKey getPublicKey(byte[] keyBytes)
            throws NoSuchAlgorithmException, InvalidKeySpecException {
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(RSA);
        PublicKey publicKey = keyFactory.generatePublic(keySpec);
        return publicKey;
    }//from w w w.jav a 2 s.  c o  m

    public static PublicKey getPublicKey(String modulus,
            String publicExponent) throws NoSuchAlgorithmException,
            InvalidKeySpecException {
        BigInteger bigIntModulus = new BigInteger(modulus);
        BigInteger bigIntPrivateExponent = new BigInteger(publicExponent);
        RSAPublicKeySpec keySpec = new RSAPublicKeySpec(bigIntModulus,
                bigIntPrivateExponent);
        KeyFactory keyFactory = KeyFactory.getInstance(RSA);
        PublicKey publicKey = keyFactory.generatePublic(keySpec);
        return publicKey;
    }
}

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