// java后台生成的

var publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDTu5u08Wel08uWM02GYYRlFXfmEHH7DAbSWufUdU8NlZrE/4BAOwqPMu/vMLdCi4GRHDSmWhoqjC5/7oKoALl6nFCAObtSl6RiWdc8KvcN1D45PASs8M/YPY+oa8iNYZA/drtgXEw4NniC0EB47miGVL4POyLOE3dJlk4LD/AjtQIDAQAB";

var encrypt = new JSEncrypt();

encrypt.setPublicKey(publicKey);

// 加密

alert(encrypt.encrypt("hello"));

import java.security.KeyPair;

import java.security.KeyPairGenerator;

import java.security.SecureRandom;

import java.security.Security;

import java.security.interfaces.RSAPrivateKey;

import java.security.interfaces.RSAPublicKey;

import javax.crypto.Cipher;

import org.apache.commons.codec.binary.Base64;

public class RSAUtils {

    private static final KeyPair keyPair = initKey();

    private static KeyPair initKey(){

        try {

            Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

            SecureRandom random = new SecureRandom();

            KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", "BC");

            generator.initialize(1024, random);

            return generator.generateKeyPair();

        }catch (Exception e) {

            throw new RuntimeException(e);

        }

    }

    /**

     * 生成public key

     * @return

     */

    public static String generateBase64PublicKey(){

        RSAPublicKey key = (RSAPublicKey)keyPair.getPublic();

        return new String(Base64.encodeBase64(key.getEncoded()));

    }

    /**

     * 解密

     * @param string

     * @return

     */

    public static String decryptBase64(String string) {

        return new String(decrypt(Base64.decodeBase64(string)));

    }

    private static byte[] decrypt(byte[] string) {

        try {

            Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

            Cipher cipher = Cipher.getInstance("RSA/None/PKCS1Padding", "BC");

            RSAPrivateKey pbk = (RSAPrivateKey)keyPair.getPrivate();

            cipher.init(Cipher.DECRYPT_MODE, pbk);

            byte[] plainText = cipher.doFinal(string);

            return plainText;

        }catch (Exception e) {

            throw new RuntimeException(e);

        }

    }

    public static void main(String[] args) {

        // 生成public key

        System.out.println(generateBase64PublicKey());

        // 解密

        System.out.println(decryptBase64("wAfY9JkoKay9SxcPIs1FcG+t6sR+wYwAs/mh9DpfcBraxzqoZdb9LyaAigzFQ0EKck9OyHL0dhv+Uxuw5hHw6CPT0B2Z0i1gwrjDUNaL1gWvqt1pDJVGrIYPLJSjs9xktFhY1jbxQgXGjyCt06Rwid5sJknw90AUO0CyQulfipg="));

    }

}