Rsa 加解密算法

程序员文章站 2022-06-21 21:13:27

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package gjp.tools;

/**
* @Auther: gaojp
* @Date: 2019/3/13 09:15
* @Description:
*/

import org.apache.commons.codec.binary.Base64;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

/** */

/**
* 
* BASE64编码解码工具包
* 
* 
*/
public class Base64Utils {

 /** */
 /**
 * 文件读取缓冲区大小
 */
 private static final int CACHE_SIZE = 1024;

 /** */
 /**
 * 
 * BASE64字符串解码为二进制数据
 * 
 *
 * @param base64
 * @return
 * @throws Exception
 */
 public static byte[] decode(String base64) throws Exception {
 Base64 base = new Base64();
 return base.decode(base64.getBytes());
 }

 /** */
 /**
 * 
 * 二进制数据编码为BASE64字符串
 * 
 *
 * @param bytes
 * @return
 * @throws Exception
 */
 public static String encode(byte[] bytes) throws Exception {
 Base64 base = new Base64();
 return new String(base.encode(bytes));
 }

 /** */
 /**
 * 
 * 将文件编码为BASE64字符串
 * 
 * 
 * 大文件慎用，可能会导致内存溢出
 * @param filePath 文件绝对路径
 * @return
 * @throws Exception
 */
 public static String encodeFile(String filePath) throws Exception {
 byte[] bytes = fileToByte(filePath);
 return encode(bytes);
 }

 /** */
 /**
 * 
 * BASE64字符串转回文件
 * 
 *
 * @param filePath 文件绝对路径
 * @param base64 编码字符串
 * @throws Exception
 */
 public static void decodeToFile(String filePath, String base64) throws Exception {
 byte[] bytes = decode(base64);
 byteArrayToFile(bytes, filePath);
 }

 /** */
 /**
 * 
 * 文件转换为二进制数组
 * 
 *
 * @param filePath 文件路径
 * @return
 * @throws Exception
 */
 public static byte[] fileToByte(String filePath) throws Exception {
 byte[] data = new byte[0];
 File file = new File(filePath);
 if (file.exists()) {
 FileInputStream in = new FileInputStream(file);
 ByteArrayOutputStream out = new ByteArrayOutputStream(2048);
 byte[] cache = new byte[CACHE_SIZE];
 int nRead = 0;
 while ((nRead = in.read(cache)) != -1) {
 out.write(cache, 0, nRead);
 out.flush();
 }
 out.close();
 in.close();
 data = out.toByteArray();
 }
 return data;
 }

 /** */
 /**
 * 
 * 二进制数据写文件
 * 
 *
 * @param bytes 二进制数据
 * @param filePath 文件生成目录
 */
 public static void byteArrayToFile(byte[] bytes, String filePath) throws Exception {
 InputStream in = new ByteArrayInputStream(bytes);
 File destFile = new File(filePath);
 if (!destFile.getParentFile().exists()) {
 destFile.getParentFile().mkdirs();
 }
 destFile.createNewFile();
 OutputStream out = new FileOutputStream(destFile);
 byte[] cache = new byte[CACHE_SIZE];
 int nRead = 0;
 while ((nRead = in.read(cache)) != -1) {
 out.write(cache, 0, nRead);
 out.flush();
 }
 out.close();
 in.close();
 }

}

package gjp.tools;

/**
* @Auther: gaojp
* @Date: 2019/3/13 09:19
* @Description:
*
* RsaUtil工具类，可以调用里面的方法，产生公钥私钥对，和采用公钥加密，私钥加密等
*/

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;

/** */

/**
* 
* RSA公钥/私钥/签名工具包
* 
*/
public class RsaUtil {
 /** */
 /**
 * 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;

 /** */
 /**
 * 
 * 生成密钥对(公钥和私钥)
 * 
 *
 * @return
 * @throws Exception
 */
 public static Map<String, Object> genKeyPair() throws Exception {
 KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
 keyPairGen.initialize(1024);
 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 data 已加密数据
 * @param privateKey 私钥(BASE64编码)
 * @return
 * @throws Exception
 */
 public static String sign(byte[] data, String privateKey) throws Exception {
 byte[] keyBytes = Base64Utils.decode(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 Base64Utils.encode(signature.sign());
 }

 /** */
 /**
 * 
 * 校验数字签名
 * 
 *
 * @param data 已加密数据
 * @param publicKey 公钥(BASE64编码)
 * @param sign 数字签名
 * @return
 * @throws Exception
 */
 public static boolean verify(byte[] data, String publicKey, String sign) throws Exception {
 byte[] keyBytes = Base64Utils.decode(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(Base64Utils.decode(sign));
 }

 /** */
 /**
 * 
 * 私钥解密
 * 
 *
 * @param encryptedData 已加密数据
 * @param privateKey 私钥(BASE64编码)
 * @return
 * @throws Exception
 */
 public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey) throws Exception {
 byte[] keyBytes = Base64Utils.decode(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)
 * @return
 * @throws Exception
 */
 public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey) throws Exception {
 byte[] keyBytes = Base64Utils.decode(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 publicKey 公钥(BASE64编码)
 * @return
 * @throws Exception
 */
 public static byte[] encryptByPublicKey(byte[] data, String publicKey) throws Exception {
 byte[] keyBytes = Base64Utils.decode(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)
 * @return
 * @throws Exception
 */
 public static byte[] encryptByPrivateKey(byte[] data, String privateKey) throws Exception {
 byte[] keyBytes = Base64Utils.decode(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
 * @return
 * @throws Exception
 */
 public static String getPrivateKey(Map<String, Object> keyMap) throws Exception {
 Key key = (Key) keyMap.get(PRIVATE_KEY);
 return Base64Utils.encode(key.getEncoded());
 }

 /** */
 /**
 * 
 * 获取公钥
 * 
 *
 * @param keyMap 密钥对
 * @return
 * @throws Exception
 */
 public static String getPublicKey(Map<String, Object> keyMap) throws Exception {
 Key key = (Key) keyMap.get(PUBLIC_KEY);
 return Base64Utils.encode(key.getEncoded());
 }

 /**
 * java端公钥加密
 */
 public static String encryptedDataOnJava(String data, String PUBLICKEY) {
 try {
 data = Base64Utils.encode(encryptByPublicKey(data.getBytes("UTF-8"), PUBLICKEY));
 } catch (Exception e) {
 e.printStackTrace();
 }
 return data;
 }

 /**
 * java端私钥解密
 */
 public static String decryptDataOnJava(String data, String PRIVATEKEY) {
 String temp = "";
 try {
 byte[] rs = Base64Utils.decode(data);
 temp = new String(RsaUtil.decryptByPrivateKey(rs, PRIVATEKEY), "UTF-8"); //以utf-8的方式生成字符串

 } catch (Exception e) {
 e.printStackTrace();
 }
 return temp;
 }

}

测试类;

package gjp.tools;

/**
* @Auther: gaojp
* @Date: 2019/3/13 09:26
* @Description:
*/

 import java.util.Map;

 import org.junit.Test;

public class TestMain {

 static String publicKey;
 static String privateKey;

 static {
 try {
 Map<String, Object> keyMap = RsaUtil.genKeyPair();
 publicKey = RsaUtil.getPublicKey(keyMap);
 privateKey = RsaUtil.getPrivateKey(keyMap);
 System.err.println("公钥: \n\r" + publicKey);
 System.err.println("私钥： \n\r" + privateKey);
 } catch (Exception e) {
 e.printStackTrace();
 }
 }

 public static void main(String[] args) throws Exception {
 testJavaRsa();
 }



 /*
 * 测试自己封装java端加密和解密的方法
 */

 static void testJavaRsa() {
 String PUBLICKEY ="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCwmE0XZV0DUAU1MGKppV37XaoHjzSXqhJC6Oj9TP/mAkcvqefDSEieigJzUBwJcvcJpmhI8dSYDUBUPoiknJXHYkUCGCaWgMgcC2WS+iVqqwx04Kmp5+X0q5XhxpD62ASAHsLM63goU9DLgqtfGZLc27jOy/k4+1khIoqz69pvswIDAQAB";
 String PRIVATEKEY ="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";
 String data = "DoNews3月15日消息（记者费倩文）京东集团宣布，京东集团首席技术官（CTO）张晨由于家庭原因需长期在海外生活将于2019年6月30日起担任集团顾问，同时卸任CTO一职位。\n" +
 "张晨表示，“我很骄傲过去能够成为京东集团决策层的一员，也很荣幸能在京东转型成长的过程中担任首席技术官。因为个人和家庭原因的规划考虑，很遗憾我无法继续全职在中国工作，但我还是很高兴能继续作为集团的顾问支持京东的发展。”（完）!@#$%^&*()_+/<>?据公开资料显示，张晨曾任雅虎全球副总裁、雅虎北京全球研发中心创始人兼总裁，在雅虎公司任职长达18年，2015年3月31日，张晨正式完加盟京东，担任京东集团高级副总裁，负责京东商城技术研发体系工作；2015年11月16日，京东宣布任命张晨担任CTO。对于张晨的卸任，京东集团表示，“我们非常感谢张晨加入京东以来对集团的出色贡献和对研发团队的领导，希望他在新的角色上继续为推动京东技术的发展，并祝愿他和他的家人一切顺利。京东也会不断扩充技术领军人物，进一步强化京东的研发能力。”你好啊，冯老师！s 223 1@324234234sfsfsf";
 String pwd = RsaUtil.encryptedDataOnJava(data, PUBLICKEY);
 System.out.println("加密数据：" + pwd);

 System.out.println("解密数据：" + RsaUtil.decryptDataOnJava(pwd, PRIVATEKEY));
 System.out.println("****************");
 System.out.println("明文信息：" + data);
 }



}

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