前端js jsencrypt加密，后端解密

前端引入jsencrypt.min.js
链接：

    var encrypt = new JSEncrypt();
    encrypt.setPublicKey(key);//key为公钥，根据下一步操作生成公钥私钥，公钥放入前端加密使用
    var passwordrsa = encrypt.encrypt(password);

生成公钥私钥方法

public static void test() throws Exception {
    // 1.初始化秘钥
    KeyPairGenerator keyPairGenerator;
    try {
        keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        // 随机数生成器
        SecureRandom sr = new SecureRandom();
        // 设置1024位长的秘钥
        keyPairGenerator.initialize(1024, sr);
        // 开始创建
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        //获取公钥
        RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
        //获取私钥
        RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
        //对公钥进行编码
        String PUBLIC_KEY = Base64.encodeBase64String(rsaPublicKey.getEncoded());
        System.out.println("公钥=" + PUBLIC_KEY);
        //对私钥进行编码
        String PRIVATE_KEY = Base64.encodeBase64String(rsaPrivateKey.getEncoded());
        System.out.println("私钥=" + PRIVATE_KEY);
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
}

后端解密

/**
 * RSA加密解密
 *
 * @author ruoyi
 **/
public class RsaUtils {
    // Rsa 私钥
    public static String privateKey = "hQ+cPkoxt6y5NI9kVRtSLUyHpAXsBsw6cwbjveKDGdpv4CRbaulErzbgFkuqckToQyvybY83osdbD1KyMpIVWlvDOKrbtNBtbLQqv+7vBtKp6KJZ1HYwF1";

	  /*
	  *解密前端参数
	  */
    public static void main(String[] args) throws Exception {
        String jm = decryptByPrivateKey(passwordrsa );
    }


    /**
     * 私钥解密
     *
     * @param text 私钥
     * @param text 待解密的文本
     * @return 解密后的文本
     */
    public static String decryptByPrivateKey(String text) throws Exception {
        return decryptByPrivateKey(privateKey, text);
    }

    /**
     * 公钥解密
     *
     * @param publicKeyString 公钥
     * @param text            待解密的信息
     * @return 解密后的文本
     */
    public static String decryptByPublicKey(String publicKeyString, String text) throws Exception {
        X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, publicKey);
        byte[] result = cipher.doFinal(Base64.decodeBase64(text));
        return new String(result);
    }

    /**
     * 私钥加密
     *
     * @param privateKeyString 私钥
     * @param text             待加密的信息
     * @return 加密后的文本
     */
    public static String encryptByPrivateKey(String privateKeyString, String text) throws Exception {
        PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, privateKey);
        byte[] result = cipher.doFinal(text.getBytes());
        return Base64.encodeBase64String(result);
    }

    /**
     * 私钥解密
     *
     * @param privateKeyString 私钥
     * @param text             待解密的文本
     * @return 解密后的文本
     */
    public static String decryptByPrivateKey(String privateKeyString, String text) throws Exception {
        PKCS8EncodedKeySpec pkcs8EncodedKeySpec5 = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec5);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        byte[] result = cipher.doFinal(Base64.decodeBase64(text));
        return new String(result);
    }

    /**
     * 公钥加密
     *
     * @param publicKeyString 公钥
     * @param text            待加密的文本
     * @return 加密后的文本
     */
    public static String encryptByPublicKey(String publicKeyString, String text) throws Exception {
        X509EncodedKeySpec x509EncodedKeySpec2 = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec2);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        byte[] result = cipher.doFinal(text.getBytes());
        return Base64.encodeBase64String(result);
    }

    /**
     * 构建RSA密钥对
     *
     * @return 生成后的公私钥信息
     */
    public static RsaKeyPair generateKeyPair() throws NoSuchAlgorithmException {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        keyPairGenerator.initialize(1024);
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
        RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
        String publicKeyString = Base64.encodeBase64String(rsaPublicKey.getEncoded());
        String privateKeyString = Base64.encodeBase64String(rsaPrivateKey.getEncoded());
        return new RsaKeyPair(publicKeyString, privateKeyString);
    }

    /**
     * RSA密钥对对象
     */
    public static class RsaKeyPair {
        private final String publicKey;
        private final String privateKey;

        public RsaKeyPair(String publicKey, String privateKey) {
            this.publicKey = publicKey;
            this.privateKey = privateKey;
        }

        public String getPublicKey() {
            return publicKey;
        }

        public String getPrivateKey() {
            return privateKey;
        }
    }
}