Java代码实现RSA非对称加密

coderzzc
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(blog.csdn.net/qq_31856061…)

依赖

<dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>1.12</version>
</dependency>

工具类

import org.apache.commons.codec.binary.Base64;
 
import java.io.ByteArrayOutputStream;
import java.security.Key;
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 java.util.HashMap;
import java.util.Map;
 
import javax.crypto.Cipher;
 
/** */
/**
 * <p>
 * RSA公钥/私钥/签名工具包
 * </p>
 * <p>
 * 罗纳德·李维斯特（Ron [R]ivest）、阿迪·萨莫尔（Adi [S]hamir）和伦纳德·阿德曼（Leonard [A]dleman）
 * </p>
 * <p>
 * 字符串格式的密钥在未在特殊说明情况下都为BASE64编码格式<br/>
 * 由于非对称加密速度极其缓慢，一般文件不使用它来加密而是使用对称加密，<br/>
 * 非对称加密算法可以用来对对称加密的密钥加密，这样保证密钥的安全也就保证了数据的安全
 * </p>
 */
public class RSAUtils {
 
	/**
	 * 加密算法RSA
	 */
	public static final String KEY_ALGORITHM = "RSA";
 
	/**
	 * 签名算法
	 */
	public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
 
	/**
	 * 获取公钥的key
	 */
	private static final String PUBLIC_KEY = "RSAPublicKey";
 
	/**
	 * 获取私钥的key
	 */
	private static final String PRIVATE_KEY = "RSAPrivateKey";
 
	/**
	 * RSA最大加密明文大小
	 */
	private static final int MAX_ENCRYPT_BLOCK = 117;
 
	/**
	 * RSA最大解密密文大小
	 */
	private static final int MAX_DECRYPT_BLOCK = 128;
 
	/**
	 * RSA 位数 如果采用2048 上面最大加密和最大解密则须填写:  245 256
	 */
	private static final int INITIALIZE_LENGTH = 1024;
 
	/**
	 * 生成密钥对(公钥和私钥)
	 */
	public static Map<String, Object> genKeyPair() throws Exception {
		KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
		keyPairGen.initialize(INITIALIZE_LENGTH);
		KeyPair keyPair = keyPairGen.generateKeyPair();
		RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
		RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
		Map<String, Object> keyMap = new HashMap<String, Object>(2);
		keyMap.put(PUBLIC_KEY, publicKey);
		keyMap.put(PRIVATE_KEY, privateKey);
		return keyMap;
	}
 
	/**
	 * 用私钥对信息生成数字签名
	 * @param encryptedData 已加密数据
	 * @param publicKey 公钥(BASE64编码)
	 */
	public static String sign(byte[] data, String privateKey) throws Exception {
		byte[] keyBytes = Base64.decodeBase64(privateKey);
		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
		Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
		signature.initSign(privateK);
		signature.update(data);
		return Base64.encodeBase64String(signature.sign());
	}
 
	/**
	 * 校验数字签名
	 * @param encryptedData 已加密数据
	 * @param publicKey 公钥(BASE64编码)
	 */
	public static boolean verify(byte[] data, String publicKey, String sign) throws Exception {
		byte[] keyBytes = Base64.decodeBase64(publicKey);
		X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		PublicKey publicK = keyFactory.generatePublic(keySpec);
		Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
		signature.initVerify(publicK);
		signature.update(data);
		return signature.verify(Base64.decodeBase64(sign));
	}
 
	/**
	 * 私钥解密
	 * @param encryptedData 已加密数据
	 * @param publicKey 公钥(BASE64编码)
	 */
	public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey) throws Exception {
		byte[] keyBytes = Base64.decodeBase64(privateKey);
		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.DECRYPT_MODE, privateK);
		int inputLen = encryptedData.length;
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		int offSet = 0;
		byte[] cache;
		int i = 0;
		// 对数据分段解密
		while (inputLen - offSet > 0) {
			if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
				cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
			} else {
				cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
			}
			out.write(cache, 0, cache.length);
			i++;
			offSet = i * MAX_DECRYPT_BLOCK;
		}
		byte[] decryptedData = out.toByteArray();
		out.close();
		return decryptedData;
	}

	/**
	 * 公钥解密
	 * @param encryptedData 已加密数据
	 * @param publicKey 公钥(BASE64编码)
	 */
	public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey) throws Exception {
		byte[] keyBytes = Base64.decodeBase64(publicKey);
		X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key publicK = keyFactory.generatePublic(x509KeySpec);
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.DECRYPT_MODE, publicK);
		int inputLen = encryptedData.length;
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		int offSet = 0;
		byte[] cache;
		int i = 0;
		// 对数据分段解密
		while (inputLen - offSet > 0) {
			if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
				cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
			} else {
				cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
			}
			out.write(cache, 0, cache.length);
			i++;
			offSet = i * MAX_DECRYPT_BLOCK;
		}
		byte[] decryptedData = out.toByteArray();
		out.close();
		return decryptedData;
	}
 
	/** */
	/**
	 * 公钥加密
	 * @param data 源数据
	 * @param privateKey 私钥(BASE64编码)
	 */
	public static byte[] encryptByPublicKey(byte[] data, String publicKey) throws Exception {
		byte[] keyBytes = Base64.decodeBase64(publicKey);
		X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key publicK = keyFactory.generatePublic(x509KeySpec);
		// 对数据加密
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.ENCRYPT_MODE, publicK);
		int inputLen = data.length;
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		int offSet = 0;
		byte[] cache;
		int i = 0;
		// 对数据分段加密
		while (inputLen - offSet > 0) {
			if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
				cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
			} else {
				cache = cipher.doFinal(data, offSet, inputLen - offSet);
			}
			out.write(cache, 0, cache.length);
			i++;
			offSet = i * MAX_ENCRYPT_BLOCK;
		}
		byte[] encryptedData = out.toByteArray();
		out.close();
		return encryptedData;
	}
 
	/**
	 * 私钥加密
	 * @param data 源数据
	 * @param privateKey 私钥(BASE64编码)
	 */
	public static byte[] encryptByPrivateKey(byte[] data, String privateKey) throws Exception {
		byte[] keyBytes = Base64.decodeBase64(privateKey);
		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.ENCRYPT_MODE, privateK);
		int inputLen = data.length;
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		int offSet = 0;
		byte[] cache;
		int i = 0;
		// 对数据分段加密
		while (inputLen - offSet > 0) {
			if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
				cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
			} else {
				cache = cipher.doFinal(data, offSet, inputLen - offSet);
			}
			out.write(cache, 0, cache.length);
			i++;
			offSet = i * MAX_ENCRYPT_BLOCK;
		}
		byte[] encryptedData = out.toByteArray();
		out.close();
		return encryptedData;
	}
 
	/**
	 * 获取私钥
	 * @param keyMap 密钥对
	 */
	public static String getPrivateKey(Map<String, Object> keyMap) throws Exception {
		Key key = (Key) keyMap.get(PRIVATE_KEY);
		return Base64.encodeBase64String(key.getEncoded());
	}
 
	/**
	 * 获取公钥
	 * @param keyMap 密钥对
	 */
	public static String getPublicKey(Map<String, Object> keyMap) throws Exception {
		Key key = (Key) keyMap.get(PUBLIC_KEY);
		return Base64.encodeBase64String(key.getEncoded());
	}
 
	/**
	 * java端公钥加密
	 */
	public static String encryptedDataOnJava(String data, String PUBLICKEY) {
		try {
			data = Base64.encodeBase64String(encryptByPublicKey(data.getBytes(), PUBLICKEY));
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return data;
	}
 
	/**
	 * java端私钥解密
	 */
	public static String decryptDataOnJava(String data, String PRIVATEKEY) {
		String temp = "";
		try {
			byte[] rs = Base64.decodeBase64(data);
			temp = new String(RSAUtils.decryptByPrivateKey(rs, PRIVATEKEY),"UTF-8");
 
		} catch (Exception e) {
			e.printStackTrace();
		}
		return temp;
	}
 
	public static void main(String[] args) throws  Exception{}
}

测试工具类创建密钥对

public class RSAUtilsTest {

    @Test
    public void genKeyPair() throws Exception {
        Map<String, Object> map = RSAUtils.genKeyPair();
        String publicKey = RSAUtils.getPublicKey(map);
        String privateKey = RSAUtils.getPrivateKey(map);
        System.out.println("publicKey = " + publicKey);
        System.out.println("privateKey = " + privateKey);
    }
}

前端加密

//下载依赖
npm i -S jsencrypt
//在使用文件中引入
import { JSEncrypt } from "jsencrypt";
// 公钥
const publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCAjZxdeSIZvA4WNWkqzfCYocOr7o1FZsEFfYTiLYSP5A9ECojwf3Wx8JTAmSRecNgJufFgfgAFdujtO59LKoV7dPRXdRTs0cplHZesDF/TjrJUQVcwaUqEWumL5IxEoHvzQgiTuoeuAmQVl8zuaNWyCiskshD9wp5i+tP4cj1yAQIDAQAB";
// JSEncrypt对象
const jsEncrypt = new JSEncrypt();
jsEncrypt.setPublicKey(publicKey);

// 加密
function encrypt(str) {
    return jsEncrypt.encrypt(str);
}
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