- --
- /*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
- package javaapplication1;
- 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;
- /**
- *
- * @author jk
- */
- public class RSAUtils {
- /** */
- /**
- * 加密算法 RSA
- */
- public static final String KEY_ALGORITHM = "RSA";
- /** */
- /**
- * RSA 最大加密明文大小
- */
- private static final int MAX_ENCRYPT_BLOCK = 117;
- 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;
- }
- /**
- * java 端公钥加密
- */
- public static String encryptedDataOnJava(String data, String PUBLICKEY) {
- try {
- data = Base64Utils.encode(encryptByPublicKey(data.getBytes(), PUBLICKEY));
- } catch (Exception e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- return data;
- }
- }
- --
- package javaapplication1;
- 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;
- import org.apache.commons.codec.binary.Base64;
- /** */
- /**
- * <p>
- * BASE64 编码解码工具包
- * </p>
- * <p>
- * 依赖 javabase64-1.3.1.jar
- * </p>
- *
- * @author IceWee
- * @date 2012-5-19
- * @version 1.0
- */
- public class Base64Utils {
- /** */
- /**
- * 文件读取缓冲区大小
- */
- private static final int CACHE_SIZE = 1024;
- /** */
- /**
- * <p>
- * BASE64 字符串解码为二进制数据
- * </p>
- *
- * @param base64
- * @return
- * @throws Exception
- */
- public static byte[] decode(String str) throws Exception {
- Base64 _base64 = new Base64();
- return _base64.decodeBase64(str.getBytes());
- }
- /** */
- /**
- * <p>
- * 二进制数据编码为 BASE64 字符串
- * </p>
- *
- * @param bytes
- * @return
- * @throws Exception
- */
- public static String encode(byte[] bytes) throws Exception {
- Base64 _base64 = new Base64();
- return new String(_base64.encodeBase64Chunked(bytes));
- }
- /** */
- /**
- * <p>
- * 将文件编码为 BASE64 字符串
- * </p>
- * <p>
- * 大文件慎用, 可能会导致内存溢出
- * </p>
- *
- * @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);
- }
- /** */
- /**
- * <p>
- * BASE64 字符串转回文件
- * </p>
- *
- * @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);
- }
- /** */
- /**
- * <p>
- * 文件转换为二进制数组
- * </p>
- *
- * @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;
- }
- /** */
- /**
- * <p>
- * 二进制数据写文件
- * </p>
- *
- * @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();
- }
- }
- --
来源: http://www.bubuko.com/infodetail-2973361.html