Using JDK RSA - Java Security

Java examples for Security:RSA

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Description

Using JDK RSA

Demo Code


import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

import org.apache.commons.codec.binary.Hex;

public class ImoocRSA {

    private static String src = "imooc security rsa";

    public static void main(String[] args) {
        jdkRSA();//from  w  ww .j a  v a  2s.  c  om
    }

    public static void jdkRSA() {
        try {
            //1.
            KeyPairGenerator keyPairGenerator = KeyPairGenerator
                    .getInstance("RSA");
            keyPairGenerator.initialize(512);
            KeyPair keyPair = keyPairGenerator.generateKeyPair();
            RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
            RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair
                    .getPrivate();

            //2.
            PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(
                    rsaPrivateKey.getEncoded());
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            PrivateKey privateKey = keyFactory
                    .generatePrivate(pkcs8EncodedKeySpec);
            Signature signature = Signature.getInstance("MD5withRSA");
            signature.initSign(privateKey);
            signature.update(src.getBytes());
            byte[] result = signature.sign();
            System.out.println("jdk rsa sign : "
                    + Hex.encodeHexString(result));

            //3.
            X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(
                    rsaPublicKey.getEncoded());
            keyFactory = KeyFactory.getInstance("RSA");
            PublicKey publicKey = keyFactory
                    .generatePublic(x509EncodedKeySpec);
            signature = Signature.getInstance("MD5withRSA");
            signature.initVerify(publicKey);
            signature.update(src.getBytes());
            boolean bool = signature.verify(result);
            System.out.println("jdk rsa verify : " + bool);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

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