RSA加密实现之JAVA方式

待我称王封你为后i 2023-10-13 21:05 1阅读 0赞

package com.xxxx.tax.util;
 import com.xxxxx.tax.util.ExceptionUtil;
 
 import lombok.extern.log4j.Log4j;
 
 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 org.apache.commons.codec.binary.Base64;
 import javax.crypto.Cipher;
 
 
 @Log4j
 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;
 
 /** *//**
 * 
 * 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);
 
 		String publicKeyString = new String(Base64Util.encode(publicKey.getEncoded())); 
 		// 得到私钥字符串 
 		String privateKeyString = new String(Base64Util.encode((privateKey.getEncoded()))); 
 		
 System.out.println(publicKeyString);
 System.out.println(privateKeyString);
 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 = Base64Util.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 Base64Util.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 = Base64Util.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(Base64Util.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 String decryptByPrivateKey(byte[] encryptedData, String privateKey)
 throws Exception {
 byte[] keyBytes = Base64Util.decode(privateKey);
 PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
 KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
 Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
 Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
 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 Base64Util.encode(decryptedData);
 }
 
 /**
 * 公钥解密
 *
 * @param publicKeyText
 * @param text
 * @return
 * @throws Exception
 */
 public static String decryptByPublicKey(String publicKeyText, String text) throws Exception {
 X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyText));
 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);
 }
 
 /** *//**
 * 
 * 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 = Base64Util.decode(publicKey);
 X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
 KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
 Key publicK = keyFactory.generatePublic(x509KeySpec);
 Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
 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 String encryptByPublicKey(byte[] data, String publicKey)
 throws Exception {
 byte[] keyBytes = Base64Util.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("RSA/ECB/PKCS1Padding");
 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 Base64Util.encode(encryptedData);
 return bytesToHexString(encryptedData);
 }
 
 /** *//**
 * 
 * 公钥加密
 * 
 * 
 * @param data 源数据
 * @param publicKey 公钥(BASE64编码)
 * @return
 * @throws Exception
 */
 public static String encryptByPublicKeyByBase(byte[] data, String publicKey)
 throws Exception {
 byte[] keyBytes = Base64Util.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("RSA/ECB/PKCS1Padding");
 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 Base64Util.encode(encryptedData);
 // return bytesToHexString(encryptedData);
 }
 
 /**
 * 将字节数组转换成16进制字符串
 * @param bytes 即将转换的数据
 * @return 16进制字符串
 */
 public static String bytesToHexString(byte[] bytes) {
 StringBuffer sb = new StringBuffer(bytes.length);
 String temp = null;
 for (int i = 0; i < bytes.length; i++) {
 temp = Integer.toHexString(0xFF & bytes[i]);
 if (temp.length() < 2) {
 sb.append(0);
 }
 sb.append(temp);
 }
 return sb.toString();
 }
 
 /** *//**
 * 
 * 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 = Base64Util.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 Base64Util.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 Base64Util.encode(key.getEncoded());
 }
 
 public static void main(String[] args){
 	try {
 			//RSAUtils.genKeyPair();
 		
 		String IMAGE_PRIVATEKEY = "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";
 		String IMAGE_PUBLICKEY = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC8DcES7liaO4MziCQ0EmtrZ7LudmxBEpiNcgvv6TxEOLal4rsoQKnLcBV2Pe6i2pFAXaBrP+AnI1Pck1YxTAROZMmkJ3BfN08CKA8mZUuVaGC/IHDV7fUU3ppVEVWF6btVsaDg+tF+k9uLlK5KOAIhKbuRNh7ZjcqRC8ZSVD1qqwIDAQAB";
 
 		String str = "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";
 		String res = new String(Base64Util.decode(RSAUtils.decryptByPrivateKey(Base64Util.decode(str), IMAGE_PRIVATEKEY)));
 		System.out.println(res);
 		
 		String ss = RSAUtils.encryptByPublicKey("abcdef".getBytes(), IMAGE_PUBLICKEY);
 		System.out.println(ss);
 		} catch (Exception e) {
 			log.error(ExceptionUtil.getMessage(e));
 		}
 }
 
 }

如有问题，请私信。

xObP8s/gudi/zrPMoaJKU7K5u7e+s7/Os8yhokpBVkHP4LnYv86zzMjn0OjSqtKyv8nS1MGqz7VRUaGjDQoNCtf31d8gUVEgNDA0NTQwMjI5

题，请私信