jsencrypt.js前端參數RSA加密和Java後端RSA解密分析

時間 2020-01-30

標籤 jsencrypt.js jsencrypt 前端參數 rsa 加密 java 後端解密分析欄目 JavaScript 简体版

原文原文鏈接

轉載自素文宅博客：https://blog.yoodb.com/yoodb/article/detail/1462javascript

首先介紹一下RSA。RSA公鑰加密算法是1977年由羅納德·李維斯特（Ron Rivest）、阿迪·薩莫爾（Adi Shamir）和倫納德·阿德曼（Leonard Adleman）一塊兒提出的。公鑰私鑰成對出現，用其中一個加密只能用另外一個解密，經常使用公鑰加密私鑰解密。html

RSA的安全性依賴於大數分解，可是否等同於大數分解一直未能獲得理論上的證實，由於沒有證實破解RSA就必定須要做大數分解。假設存在一種無須分解大數的算法，那它確定能夠修改爲爲大數分解算法。 RSA 的一些變種算法已被證實等價於大數分解。無論怎樣，分解n是最顯然的攻擊方法。人們已能分解多個十進制位的大素數。所以，模數n必須選大一些，因具體適用狀況而定。前端

jsencrypt.js前端參數RSA加密引入jsencrypt.js文件，初始化對象設置key值，進行加密解密操做，具體代碼以下：java

<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Login</title>
    <script src="https://blog.yoodb.com/app/default/js/jquery-2.1.4.min.js"></script>
    <script src="https://blog.yoodb.com/app/default/js/jsencrypt.min.js"></script>
    <script type="text/javascript">
        $(function () {
            var encrypt = new JSEncrypt();
            encrypt.setPublicKey("MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCwjDm1HXDw8QH5ZtGMQIl2h/I8E+chOQA8aQ8xCR/+aHnROaN/ZU5Vmd2Zz7g6cAacR9BSm60+iSCYtvEGJKl0WqvbPGJkc8tedjNF1QqgWqkkuE6Udgw2OkEKJCxDg6PrAniR7Cc0io9G8bW4P8JDJjSbbafvMPDDFbVVUWJxxwIDAQAB");
            var data = encrypt.encrypt("blog.yoodb.com");
$('#data').val(data);
        
        
        });
    </script>
</head>
<body>
    <div>
         <input type="text" id="data" value="" />
    </div>
</body>
</html>

Java後端RSA解密 Java RSA加密解密算法工具，具體代碼以下：jquery

import javax.crypto.Cipher;

import java.security.*;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;


public class RSACode {
	public static final String KEY_ALGORITHM = "RSA";
	public static final String SIGNATURE_ALGORITHM = "MD5withRSA";

	private static final String PUBLIC_KEY = "RSAPublicKey";
	private static final String PRIVATE_KEY = "RSAPrivateKey";

	public static byte[] decryptBASE64(String key) {
		return Base64Util.decode(key);
	}

	public static String encryptBASE64(byte[] bytes) {
		return Base64Util.encode(bytes);
	}

	/**
	 * 用私鑰對信息生成數字簽名
	 * 
	 * [@param](https://my.oschina.net/u/2303379) data
	 *            加密數據
	 * [@param](https://my.oschina.net/u/2303379) privateKey
	 *            私鑰
	 * [@return](https://my.oschina.net/u/556800)
	 * [@throws](https://my.oschina.net/throws) Exception
	 */
	public static String sign(byte[] data, String privateKey) throws Exception {
		// 解密由base64編碼的私鑰
		byte[] keyBytes = decryptBASE64(privateKey);
		// 構造PKCS8EncodedKeySpec對象
		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		// KEY_ALGORITHM 指定的加密算法
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		// 取私鑰匙對象
		PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
		// 用私鑰對信息生成數字簽名
		Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
		signature.initSign(priKey);
		signature.update(data);
		return encryptBASE64(signature.sign());
	}

	/**
	 * 校驗數字簽名
	 * 
	 * [@param](https://my.oschina.net/u/2303379) data
	 *            加密數據
	 * @param publicKey
	 *            公鑰
	 * @param sign
	 *            數字簽名
	 * @return 校驗成功返回true 失敗返回false
	 * @throws Exception
	 */
	public static boolean verify(byte[] data, String publicKey, String sign)
			throws Exception {
		// 解密由base64編碼的公鑰
		byte[] keyBytes = decryptBASE64(publicKey);
		// 構造X509EncodedKeySpec對象
		X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
		// KEY_ALGORITHM 指定的加密算法
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		// 取公鑰匙對象
		PublicKey pubKey = keyFactory.generatePublic(keySpec);
		Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
		signature.initVerify(pubKey);
		signature.update(data);
		// 驗證簽名是否正常
		return signature.verify(decryptBASE64(sign));
	}

	public static byte[] decryptByPrivateKey(byte[] data, String key)
			throws Exception {
		// 對密鑰解密
		byte[] keyBytes = decryptBASE64(key);
		// 取得私鑰
		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
		// 對數據解密
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.DECRYPT_MODE, privateKey);
		return cipher.doFinal(data);
	}

	/**
	 * 解密<br>
	 * 用私鑰解密
	 * 
	 * @param data
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] decryptByPrivateKey(String data, String key)
			throws Exception {
		return decryptByPrivateKey(decryptBASE64(data), key);
	}

	/**
	 * 解密<br>
	 * 用公鑰解密
	 * 
	 * @param data
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] decryptByPublicKey(byte[] data, String key)
			throws Exception {
		// 對密鑰解密
		byte[] keyBytes = decryptBASE64(key);
		// 取得公鑰
		X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key publicKey = keyFactory.generatePublic(x509KeySpec);
		// 對數據解密
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.DECRYPT_MODE, publicKey);
		return cipher.doFinal(data);
	}

	/**
	 * 加密<br>
	 * 用公鑰加密
	 * 
	 * @param data
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] encryptByPublicKey(String data, String key)
			throws Exception {
		// 對公鑰解密
		byte[] keyBytes = decryptBASE64(key);
		// 取得公鑰
		X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key publicKey = keyFactory.generatePublic(x509KeySpec);
		// 對數據加密
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.ENCRYPT_MODE, publicKey);
		return cipher.doFinal(data.getBytes());
	}

	/**
	 * 加密<br>
	 * 用私鑰加密
	 * 
	 * @param data
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] encryptByPrivateKey(byte[] data, String key)
			throws Exception {
		// 對密鑰解密
		byte[] keyBytes = decryptBASE64(key);
		// 取得私鑰
		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
		// 對數據加密
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.ENCRYPT_MODE, privateKey);
		return cipher.doFinal(data);
	}

	/**
	 * 取得私鑰
	 * 
	 * @param keyMap
	 * @return
	 * @throws Exception
	 */
	public static String getPrivateKey(Map<String, Key> keyMap)
			throws Exception {
		Key key = (Key) keyMap.get(PRIVATE_KEY);
		return encryptBASE64(key.getEncoded());
	}

	/**
	 * 取得公鑰
	 * 
	 * @param keyMap
	 * @return
	 * @throws Exception
	 */
	public static String getPublicKey(Map<String, Key> keyMap) throws Exception {
		Key key = keyMap.get(PUBLIC_KEY);
		return encryptBASE64(key.getEncoded());
	}

	/**
	 * 初始化密鑰
	 * 
	 * @return
	 * @throws Exception
	 */
	public static Map<String, Key> initKey() throws Exception {
		KeyPairGenerator keyPairGen = KeyPairGenerator
				.getInstance(KEY_ALGORITHM);
		keyPairGen.initialize(1024);
		KeyPair keyPair = keyPairGen.generateKeyPair();
		Map<String, Key> keyMap = new HashMap(2);
		keyMap.put(PUBLIC_KEY, keyPair.getPublic());// 公鑰
		keyMap.put(PRIVATE_KEY, keyPair.getPrivate());// 私鑰
		return keyMap;
	}

	public static void main(String[] args) throws Exception {
		String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCwjDm1HXDw8QH5ZtGMQIl2h/I8E+chOQA8aQ8xCR/+aHnROaN/ZU5Vmd2Zz7g6cAacR9BSm60+iSCYtvEGJKl0WqvbPGJkc8tedjNF1QqgWqkkuE6Udgw2OkEKJCxDg6PrAniR7Cc0io9G8bW4P8JDJjSbbafvMPDDFbVVUWJxxwIDAQAB";
		String privateKey = "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";

		String inputStr = "sign";
		byte[] data = inputStr.getBytes();

		byte[] encodedData = RSACode.encryptByPrivateKey(data, privateKey);

		byte[] decodedData = RSACode
				.decryptByPrivateKey(Base64Util.decode("mIENuMEvbTkceKAzoqDLx8qiuZ12wZ5eRhZMKf2dfL+ZJkxJHnBXxNZiMpbIFHjIJSoP7sBxknR8PEPFAVgNoL2HqlEmOGFzpXugWK37fDpoKSOFpT0AKJyY4/j87F52YZlIjsJgk74+KDyrPKxagzEZejb8bAI4Ln/54UaVhd0="),
						privateKey);
		String outputStr = new String(decodedData);
		System.err.println("加密前: " + inputStr + "\n\r" + "解密後: " + outputStr);

		System.err.println("私鑰簽名——公鑰驗證簽名");
		// 產生簽名
		String sign = RSACode.sign(encodedData, privateKey);
		System.err.println("簽名:" + sign);
		// 驗證簽名
		boolean status = RSACode.verify(encodedData, publicKey, sign);
		System.err.println("狀態:" + status);
	}
}