JS客户端RSA加密，Java服务端解密

常用语网页客户端对密码加密，在后端java解密还原

java代码依赖
    <dependency>
      <groupId>commons-codec</groupId>
      <artifactId>commons-codec</artifactId>
      <version>1.4</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcprov-jdk15on</artifactId>
      <version>1.52</version>
    </dependency>

js代码依赖 jsencrypt.js

js代码：

// 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"));

java代码：

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="));
    }

}