forked from integrated_whb/integrated_whb
405 lines
14 KiB
Java
405 lines
14 KiB
Java
package com.zcloud.util;
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import javax.crypto.Cipher;
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import java.io.ByteArrayOutputStream;
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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.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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/**
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* RSA公钥/私钥/签名工具包
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* <p>
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* 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/>
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* 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/>
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* 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
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* </p>
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*
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*/
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public class RSAUtils {
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/** */
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/**
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* 加密算法RSA
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*/
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public static final String KEY_ALGORITHM = "RSA";
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/** */
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/**
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* 签名算法
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*/
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public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
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/** */
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/**
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* 获取公钥的key
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*/
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private static final String PUBLIC_KEY = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDUoHAavCikaZxjlDM6Km8cX+ye78F4oF39AcEfnE1p2Yn9pJ9WFxYZ4Vkh6F8SKMi7k4nYsKceqB1RwG996SvHQ5C3pM3nbXCP4K15ad6QhN4a7lzlbLhiJcyIKszvvK8ncUDw8mVQ0j/2mwxv05yH6LN9OKU6Hzm1ninpWeE+awIDAQAB\n";
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/** */
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/**
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* 获取私钥的key
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*/
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private static final String PRIVATE_KEY = "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";
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/** */
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/**
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* RSA最大加密明文大小
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*/
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private static final int MAX_ENCRYPT_BLOCK = 117;
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/** */
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/**
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* RSA最大解密密文大小
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*/
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private static final int MAX_DECRYPT_BLOCK = 128;
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/** */
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/**
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* <p>
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* 生成密钥对(公钥和私钥)
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* </p>
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*
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* @return
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* @throws Exception
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*/
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public static Map<String, Object> genKeyPair() throws Exception {
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KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
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keyPairGen.initialize(1024);
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KeyPair keyPair = keyPairGen.generateKeyPair();
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RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
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RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
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Map<String, Object> keyMap = new HashMap<String, Object>(2);
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keyMap.put(PUBLIC_KEY, publicKey);
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keyMap.put(PRIVATE_KEY, privateKey);
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return keyMap;
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}
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/** */
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/**
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* <p>
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* 用私钥对信息生成数字签名
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* </p>
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*
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* @param data
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* 已加密数据
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* @param privateKey
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* 私钥(BASE64编码)
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*
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* @return
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* @throws Exception
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*/
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public static String sign(byte[] data, String privateKey) throws Exception {
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byte[] keyBytes = Base64Utils.decode(privateKey);
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PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
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Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
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signature.initSign(privateK);
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signature.update(data);
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return Base64Utils.encode(signature.sign());
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}
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/** */
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/**
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* <p>
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* 校验数字签名
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* </p>
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*
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* @param data
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* 已加密数据
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* @param publicKey
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* 公钥(BASE64编码)
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* @param sign
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* 数字签名
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*
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* @return
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* @throws Exception
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*
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*/
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public static boolean verify(byte[] data, String publicKey, String sign) throws Exception {
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byte[] keyBytes = Base64Utils.decode(publicKey);
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X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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PublicKey publicK = keyFactory.generatePublic(keySpec);
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Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
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signature.initVerify(publicK);
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signature.update(data);
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return signature.verify(Base64Utils.decode(sign));
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}
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/** */
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/**
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* <P>
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* 私钥解密
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* </p>
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*
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* @param encryptedData
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* 已加密数据
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* @param privateKey
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* 私钥(BASE64编码)
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* @return
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* @throws Exception
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*/
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public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey) throws Exception {
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byte[] keyBytes = Base64Utils.decode(privateKey);
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PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
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Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
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cipher.init(Cipher.DECRYPT_MODE, privateK);
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int inputLen = encryptedData.length;
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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int offSet = 0;
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byte[] cache;
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int i = 0;
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// 对数据分段解密
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while (inputLen - offSet > 0) {
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if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
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cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
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} else {
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cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
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}
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out.write(cache, 0, cache.length);
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i++;
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offSet = i * MAX_DECRYPT_BLOCK;
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}
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byte[] decryptedData = out.toByteArray();
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out.close();
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return decryptedData;
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}
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/** */
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/**
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* <p>
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* 公钥解密
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* </p>
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*
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* @param encryptedData
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* 已加密数据
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* @param publicKey
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* 公钥(BASE64编码)
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* @return
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* @throws Exception
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*/
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public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey) throws Exception {
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byte[] keyBytes = Base64Utils.decode(publicKey);
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X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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Key publicK = keyFactory.generatePublic(x509KeySpec);
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Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
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cipher.init(Cipher.DECRYPT_MODE, publicK);
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int inputLen = encryptedData.length;
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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int offSet = 0;
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byte[] cache;
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int i = 0;
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// 对数据分段解密
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while (inputLen - offSet > 0) {
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if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
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cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
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} else {
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cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
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}
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out.write(cache, 0, cache.length);
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i++;
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offSet = i * MAX_DECRYPT_BLOCK;
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}
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byte[] decryptedData = out.toByteArray();
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out.close();
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return decryptedData;
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}
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/** */
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/**
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* <p>
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* 公钥加密
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* </p>
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*
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* @param data
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* 源数据
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* @param publicKey
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* 公钥(BASE64编码)
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* @return
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* @throws Exception
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*/
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public static byte[] encryptByPublicKey(byte[] data, String publicKey) throws Exception {
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byte[] keyBytes = Base64Utils.decode(publicKey);
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X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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Key publicK = keyFactory.generatePublic(x509KeySpec);
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// 对数据加密
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Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
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cipher.init(Cipher.ENCRYPT_MODE, publicK);
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int inputLen = data.length;
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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int offSet = 0;
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byte[] cache;
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int i = 0;
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// 对数据分段加密
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while (inputLen - offSet > 0) {
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if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
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cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
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} else {
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cache = cipher.doFinal(data, offSet, inputLen - offSet);
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}
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out.write(cache, 0, cache.length);
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i++;
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offSet = i * MAX_ENCRYPT_BLOCK;
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}
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byte[] encryptedData = out.toByteArray();
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out.close();
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return encryptedData;
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}
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/** */
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/**
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* <p>
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* 私钥加密
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* </p>
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*
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* @param data
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* 源数据
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* @param privateKey
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* 私钥(BASE64编码)
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* @return
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* @throws Exception
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*/
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public static byte[] encryptByPrivateKey(byte[] data, String privateKey) throws Exception {
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byte[] keyBytes = Base64Utils.decode(privateKey);
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PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
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Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
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cipher.init(Cipher.ENCRYPT_MODE, privateK);
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int inputLen = data.length;
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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int offSet = 0;
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byte[] cache;
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int i = 0;
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// 对数据分段加密
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while (inputLen - offSet > 0) {
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if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
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cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
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} else {
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cache = cipher.doFinal(data, offSet, inputLen - offSet);
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}
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out.write(cache, 0, cache.length);
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i++;
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offSet = i * MAX_ENCRYPT_BLOCK;
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}
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byte[] encryptedData = out.toByteArray();
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out.close();
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return encryptedData;
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}
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/** */
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/**
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* <p>
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* 获取私钥
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* </p>
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*
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* @param keyMap
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* 密钥对
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* @return
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* @throws Exception
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*/
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public static String getPrivateKey(Map<String, Object> keyMap) throws Exception {
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Key key = (Key) keyMap.get(PRIVATE_KEY);
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return Base64Utils.encode(key.getEncoded());
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}
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/** */
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/**
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* <p>
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* 获取私钥
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* </p>
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*
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* @param keyMap
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* 密钥对
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* @return
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* @throws Exception
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*/
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public static String getPrivateKey() {
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return PRIVATE_KEY;
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}
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/** */
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/**
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* <p>
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* 获取公钥
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* </p>
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*
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* @param keyMap
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* 密钥对
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* @return
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* @throws Exception
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*/
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public static String getPublicKey(Map<String, Object> keyMap) throws Exception {
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Key key = (Key) keyMap.get(PUBLIC_KEY);
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return Base64Utils.encode(key.getEncoded());
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}
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/** */
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/**
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* <p>
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* 获取公钥
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* </p>
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* @return
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* @throws Exception
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*/
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public static String getPublicKey() throws Exception {
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return PUBLIC_KEY;
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}
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/**
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* java端公钥加密
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*/
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public static String encryptedDataOnJava(String data, String PUBLICKEY) {
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try {
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data = Base64Utils.encode(encryptByPublicKey(data.getBytes(), PUBLICKEY));
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} catch (Exception e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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return data;
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}
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/**
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* java端私钥解密
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*/
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public static String decryptDataOnJava(String data, String PRIVATEKEY) {
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String temp = "";
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try {
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byte[] rs = Base64Utils.decode(data);
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temp = new String(RSAUtils.decryptByPrivateKey(rs, PRIVATEKEY),"UTF-8"); //以utf-8的方式生成字符串
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} catch (Exception e) {
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e.printStackTrace();
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}
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return temp;
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}
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public static void main(String[] args) {
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Map<String, Object> keyMap = null;
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try {
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keyMap = RSAUtils.genKeyPair();
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String publicKey = RSAUtils.getPublicKey(keyMap);
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String privateKey = RSAUtils.getPrivateKey(keyMap);
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System.err.println("公钥: \n\r" + publicKey);
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System.err.println("私钥： \n\r" + privateKey);
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// 公钥:
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// MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDE8aNkz3X5f96bW2EJ3fRQsEmtgrIzLSCSJZLf1WBay0ihEideK45md5UZIFB6HSWwBaKD4z1uAMdt5esn0AIvrQS8+nlnB+Fohzxg7yY2ooDLP2az0WVKzepbeg8igq+jflUh7/+rvndiJAnv+mnMbibFqhYsDAJ3Zq82FkOeXQIDAQAB
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// 私钥：
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// 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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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