package com.fzzy.gateway.hx2023.util;
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import java.security.*;
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import java.security.interfaces.RSAPrivateKey;
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import java.security.interfaces.RSAPublicKey;
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import java.security.spec.InvalidKeySpecException;
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import java.security.spec.PKCS8EncodedKeySpec;
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import java.security.spec.X509EncodedKeySpec;
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import java.util.HashMap;
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import java.util.Map;
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import javax.crypto.BadPaddingException;
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import javax.crypto.Cipher;
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import javax.crypto.IllegalBlockSizeException;
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import javax.crypto.NoSuchPaddingException;
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import lombok.extern.slf4j.Slf4j;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import lombok.Data;
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/**
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* RSA签名验签类
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*
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*/
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@Slf4j
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@Data
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public class OpenApiRsaSigner {
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/**
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* 后续用于缓存公钥和私钥
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*/
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private static Map<String, OpenApiRsaSigner> signerMap = new HashMap<>();
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private PublicKey publicKey;
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private PrivateKey privateKey;
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/**
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* 字节数据转字符串专用集合
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*/
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private static final char[] HEX_CHAR = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
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private OpenApiRsaSigner(PublicKey publicKey, PrivateKey privateKey) {
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this.publicKey = publicKey;
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this.privateKey = privateKey;
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}
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public static OpenApiRsaSigner initSigner(String publicKey, String privateKey) {
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try {
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PublicKey publicKeyObj = loadPublicKeyByStr(publicKey);
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PrivateKey privateKeyObj = loadPrivateKeyByStr(privateKey);
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return new OpenApiRsaSigner(publicKeyObj, privateKeyObj);
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}catch (Exception e) {
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log.error("initSigner(),exception happens.", e);
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}
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return null;
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}
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/**
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* 从字符串中加载公钥
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*
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* @param publicKeyStr 公钥数据字符串
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* @throws Exception 加载公钥时产生的异常
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*/
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public static RSAPublicKey loadPublicKeyByStr(String publicKeyStr) throws Exception {
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try {
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byte[] buffer = Base64Utils.decode(publicKeyStr);
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KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
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return (RSAPublicKey) keyFactory.generatePublic(keySpec);
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} catch (NoSuchAlgorithmException e) {
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throw new Exception("无此算法");
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} catch (InvalidKeySpecException e) {
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throw new Exception("公钥非法");
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} catch (NullPointerException e) {
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throw new Exception("公钥数据为空");
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}
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}
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/**
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* @param privateKeyStr
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* @return
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* @throws Exception
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*/
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public static RSAPrivateKey loadPrivateKeyByStr(String privateKeyStr) throws Exception {
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try {
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byte[] buffer = Base64Utils.decode(privateKeyStr);
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PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
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KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
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} catch (NoSuchAlgorithmException e) {
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throw new Exception("无此算法");
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} catch (InvalidKeySpecException e) {
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throw new Exception("私钥非法");
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} catch (NullPointerException e) {
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throw new Exception("私钥数据为空");
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}
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}
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/**
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* 公钥加密过程
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*
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* @param publicKey 公钥
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* @param plainTextData 明文数据
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* @return
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* @throws Exception 加密过程中的异常信息
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*/
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public static byte[] encrypt(RSAPublicKey publicKey, byte[] plainTextData) throws Exception {
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if (publicKey == null) {
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throw new Exception("加密公钥为空, 请设置");
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}
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Cipher cipher = null;
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try {
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// 使用默认RSA
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cipher = Cipher.getInstance("RSA");
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// cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
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cipher.init(Cipher.ENCRYPT_MODE, publicKey);
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byte[] output = cipher.doFinal(plainTextData);
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return output;
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} catch (NoSuchAlgorithmException e) {
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throw new Exception("无此加密算法");
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} catch (NoSuchPaddingException e) {
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log.error("exception happens.", e);
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return null;
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} catch (InvalidKeyException e) {
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throw new Exception("加密公钥非法,请检查");
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} catch (IllegalBlockSizeException e) {
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throw new Exception("明文长度非法");
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} catch (BadPaddingException e) {
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throw new Exception("明文数据已损坏");
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}
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}
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/**
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* 私钥加密过程
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*
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* @param privateKey 私钥
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* @param plainTextData 明文数据
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* @return
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* @throws Exception 加密过程中的异常信息
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*/
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public static byte[] encrypt(RSAPrivateKey privateKey, byte[] plainTextData) throws Exception {
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if (privateKey == null) {
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throw new Exception("加密私钥为空, 请设置");
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}
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Cipher cipher = null;
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try {
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// 使用默认RSA
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cipher = Cipher.getInstance("RSA");
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cipher.init(Cipher.ENCRYPT_MODE, privateKey);
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byte[] output = cipher.doFinal(plainTextData);
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return output;
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} catch (NoSuchAlgorithmException e) {
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throw new Exception("无此加密算法");
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} catch (NoSuchPaddingException e) {
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log.error("exception happens.", e);
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return null;
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} catch (InvalidKeyException e) {
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throw new Exception("加密私钥非法,请检查");
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} catch (IllegalBlockSizeException e) {
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throw new Exception("明文长度非法");
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} catch (BadPaddingException e) {
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throw new Exception("明文数据已损坏");
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}
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}
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/**
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* 私钥解密过程
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*
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* @param privateKey 私钥
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* @param cipherData 密文数据
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* @return 明文
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* @throws Exception 解密过程中的异常信息
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*/
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public static byte[] decrypt(RSAPrivateKey privateKey, byte[] cipherData) throws Exception {
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if (privateKey == null) {
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throw new Exception("解密私钥为空, 请设置");
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}
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if (cipherData == null) {
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return null;
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}
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Cipher cipher = null;
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try {
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// 使用默认RSA
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cipher = Cipher.getInstance("RSA");
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// cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
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cipher.init(Cipher.DECRYPT_MODE, privateKey);
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byte[] output = cipher.doFinal(cipherData);
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return output;
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} catch (NoSuchAlgorithmException e) {
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throw new Exception("无此解密算法");
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} catch (NoSuchPaddingException e) {
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log.error("exception happens.", e);
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return null;
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} catch (InvalidKeyException e) {
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throw new Exception("解密私钥非法,请检查");
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} catch (IllegalBlockSizeException e) {
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throw new Exception("密文长度非法");
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} catch (BadPaddingException e) {
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throw new Exception("密文数据已损坏");
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}
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}
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/**
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* 公钥解密过程
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*
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* @param publicKey 公钥
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* @param cipherData 密文数据
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* @return 明文
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* @throws Exception 解密过程中的异常信息
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*/
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public static byte[] decrypt(RSAPublicKey publicKey, byte[] cipherData) throws Exception {
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if (publicKey == null) {
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throw new Exception("解密公钥为空, 请设置");
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}
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Cipher cipher = null;
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try {
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// 使用默认RSA
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cipher = Cipher.getInstance("RSA");
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// cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
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cipher.init(Cipher.DECRYPT_MODE, publicKey);
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byte[] output = cipher.doFinal(cipherData);
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return output;
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} catch (NoSuchAlgorithmException e) {
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throw new Exception("无此解密算法");
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} catch (NoSuchPaddingException e) {
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log.error("exception happens.", e);
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return null;
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} catch (InvalidKeyException e) {
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throw new Exception("解密公钥非法,请检查");
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} catch (IllegalBlockSizeException e) {
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throw new Exception("密文长度非法");
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} catch (BadPaddingException e) {
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throw new Exception("密文数据已损坏");
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}
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}
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public static boolean verify(String content, String sign, RSAPrivateKey privateKey) throws Exception {
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byte[] singBytes = encrypt(privateKey, content.getBytes());
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return sign.equals(new String(singBytes));
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}
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/**
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* 字节数据转十六进制字符串
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*
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* @param data 输入数据
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* @return 十六进制内容
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*/
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public static String byteArrayToString(byte[] data) {
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StringBuilder stringBuilder = new StringBuilder();
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for (int i = 0; i < data.length; i++) {
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// 取出字节的高四位 作为索引得到相应的十六进制标识符 注意无符号右移
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stringBuilder.append(HEX_CHAR[(data[i] & 0xf0) >>> 4]);
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// 取出字节的低四位 作为索引得到相应的十六进制标识符
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stringBuilder.append(HEX_CHAR[(data[i] & 0x0f)]);
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if (i < data.length - 1) {
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stringBuilder.append(' ');
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}
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}
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return stringBuilder.toString();
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}
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public static OpenApiRsaSigner getInstance(String appId, String publicKey, String privateKey) {
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OpenApiRsaSigner signer = signerMap.get(appId);
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if (signer != null) {
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return signer;
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}
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try {
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signer = initSigner(publicKey, privateKey);
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if(signer != null){
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signerMap.put(appId, signer);
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}
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} catch (Exception e) {
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log.error("exception happens.", e);
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}
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return signerMap.get(appId);
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}
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}
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