package com.doumee.core.utils;
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import javax.crypto.Cipher;
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import javax.crypto.CipherInputStream;
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import javax.crypto.CipherOutputStream;
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import javax.crypto.SecretKeyFactory;
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import javax.crypto.spec.DESKeySpec;
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import javax.crypto.spec.IvParameterSpec;
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import java.io.*;
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import java.security.Key;
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import java.util.Base64;
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public class DESUtil {
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/**
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* 偏移变量，固定占8位字节
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*/
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private final static String IV_PARAMETER = "12345678";
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/**
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* 密钥算法
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*/
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private static final String ALGORITHM = "DES";
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/**
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* 加密/解密算法-工作模式-填充模式
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*/
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private static final String CIPHER_ALGORITHM = "DES/CBC/PKCS5Padding";
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/**
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* 默认编码
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*/
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private static final String CHARSET = "utf-8";
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/**
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* 生成key
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*
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* @param password
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* @return
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* @throws Exception
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*/
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private static Key generateKey(String password) throws Exception {
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DESKeySpec dks = new DESKeySpec(password.getBytes(CHARSET));
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SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
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return keyFactory.generateSecret(dks);
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}
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/**
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* DES加密字符串
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*
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* @param password 加密密码，长度不能够小于8位
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* @param data 待加密字符串
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* @return 加密后内容
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*/
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public static String encrypt(String password, String data) {
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if (password== null || password.length() < 8) {
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throw new RuntimeException("加密失败，key不能小于8位");
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}
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if (data == null)
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return null;
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try {
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Key secretKey = generateKey(password);
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Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
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IvParameterSpec iv = new IvParameterSpec(IV_PARAMETER.getBytes(CHARSET));
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cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
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byte[] bytes = cipher.doFinal(data.getBytes(CHARSET));
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//JDK1.8及以上可直接使用Base64，JDK1.7及以下可以使用BASE64Encoder
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//Android平台可以使用android.util.Base64
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return new String(Base64.getEncoder().encode(bytes));
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} catch (Exception e) {
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e.printStackTrace();
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return data;
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}
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}
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/**
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* DES解密字符串
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*
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* @param password 解密密码，长度不能够小于8位
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* @param data 待解密字符串
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* @return 解密后内容
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*/
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public static String decrypt(String password, String data) {
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if (password== null || password.length() < 8) {
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throw new RuntimeException("加密失败，key不能小于8位");
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}
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if (data == null)
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return null;
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try {
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Key secretKey = generateKey(password);
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Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
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IvParameterSpec iv = new IvParameterSpec(IV_PARAMETER.getBytes(CHARSET));
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cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
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return new String(cipher.doFinal(Base64.getDecoder().decode(data.getBytes(CHARSET))), CHARSET);
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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}
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/**
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* DES加密文件
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*
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* @param srcFile 待加密的文件
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* @param destFile 加密后存放的文件路径
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* @return 加密后的文件路径
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*/
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public static String encryptFile(String password, String srcFile, String destFile) {
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if (password== null || password.length() < 8) {
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throw new RuntimeException("加密失败，key不能小于8位");
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}
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try {
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IvParameterSpec iv = new IvParameterSpec(IV_PARAMETER.getBytes(CHARSET));
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Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
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cipher.init(Cipher.ENCRYPT_MODE, generateKey(password), iv);
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InputStream is = new FileInputStream(srcFile);
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OutputStream out = new FileOutputStream(destFile);
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CipherInputStream cis = new CipherInputStream(is, cipher);
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byte[] buffer = new byte[1024];
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int r;
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while ((r = cis.read(buffer)) > 0) {
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out.write(buffer, 0, r);
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}
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cis.close();
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is.close();
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out.close();
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return destFile;
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} catch (Exception ex) {
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ex.printStackTrace();
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}
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return null;
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}
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/**
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* DES解密文件
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*
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* @param srcFile 已加密的文件
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* @param destFile 解密后存放的文件路径
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* @return 解密后的文件路径
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*/
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public static String decryptFile(String password, String srcFile, String destFile) {
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if (password== null || password.length() < 8) {
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throw new RuntimeException("加密失败，key不能小于8位");
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}
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try {
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File file = new File(destFile);
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if (!file.exists()) {
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file.getParentFile().mkdirs();
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file.createNewFile();
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}
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IvParameterSpec iv = new IvParameterSpec(IV_PARAMETER.getBytes(CHARSET));
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Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
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cipher.init(Cipher.DECRYPT_MODE, generateKey(password), iv);
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InputStream is = new FileInputStream(srcFile);
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OutputStream out = new FileOutputStream(destFile);
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CipherOutputStream cos = new CipherOutputStream(out, cipher);
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byte[] buffer = new byte[1024];
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int r;
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while ((r = is.read(buffer)) >= 0) {
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cos.write(buffer, 0, r);
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}
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cos.close();
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is.close();
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out.close();
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return destFile;
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} catch (Exception ex) {
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ex.printStackTrace();
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}
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return null;
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}
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}
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