332 lines
11 KiB
Java
332 lines
11 KiB
Java
package com.info.sn.utils;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
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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.NoSuchPaddingException;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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public class CXAESUtil {
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/**
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* 加解密算法/工作模式/填充方式
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*/
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private static final String CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";
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public final static String HEX = "0123456789ABCDEF";
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private static final int keyLenght = 16;
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private static final String defaultV = "0";
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/**
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* 加密
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*
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* @param key 密钥
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* @param src 加密文本
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* @return
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* @throws Exception
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*/
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public static String encrypt(String key, String src) {
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// /src = Base64.encodeToString(src.getBytes(), Base64.DEFAULT);
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byte[] rawKey = toMakekey(key, keyLenght, defaultV).getBytes();// key.getBytes();
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try {
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byte[] result = encrypt(rawKey, src.getBytes("utf-8"));
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// result = Base64.encode(result, Base64.DEFAULT);
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return toHex(result);
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} catch (Exception e) {
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e.printStackTrace();
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return "";
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}
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}
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/**
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* 加密
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*
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* @param key 密钥
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* @param src 加密文本
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* @return
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* @throws Exception
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*/
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public static String encrypt2Java(String key, String src) throws Exception {
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// /src = Base64.encodeToString(src.getBytes(), Base64.DEFAULT);
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byte[] rawKey = toMakekey(key, keyLenght, defaultV).getBytes();// key.getBytes();
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byte[] result = encrypt2Java(rawKey, src.getBytes("utf-8"));
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// result = Base64.encode(result, Base64.DEFAULT);
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return toHex(result);
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}
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/**
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* 解密
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*
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* @param key 密钥
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* @param encrypted 待揭秘文本
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* @return
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* @throws Exception
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*/
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public static String decrypt(String key, String encrypted) throws Exception {
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byte[] rawKey = toMakekey(key, keyLenght, defaultV).getBytes();// key.getBytes();
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byte[] enc = toByte(encrypted);
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// enc = Base64.decode(enc, Base64.DEFAULT);
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byte[] result = decrypt(rawKey, enc);
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// /result = Base64.decode(result, Base64.DEFAULT);
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return new String(result, "utf-8");
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}
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/**
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* 密钥key ,默认补的数字，补全16位数，以保证安全补全至少16位长度,android和ios对接通过
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*
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* @param str
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* @param strLength
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* @param val
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* @return
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*/
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private static String toMakekey(String str, int strLength, String val) {
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int strLen = str.length();
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if (strLen < strLength) {
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while (strLen < strLength) {
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StringBuffer buffer = new StringBuffer();
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buffer.append(str).append(val);
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str = buffer.toString();
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strLen = str.length();
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}
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}
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return str;
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}
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/**
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* 真正的加密过程
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* 1.通过密钥得到一个密钥专用的对象SecretKeySpec
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* 2.Cipher 加密算法，加密模式和填充方式三部分或指定加密算 (可以只用写算法然后用默认的其他方式)Cipher.getInstance("AES");
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*
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* @param key
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* @param src
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* @return
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* @throws Exception
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*/
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private static byte[] encrypt(byte[] key, byte[] src) throws Exception {
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SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
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Cipher cipher = Cipher.getInstance("AES");
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cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(new byte[cipher.getBlockSize()]));
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byte[] encrypted = cipher.doFinal(src);
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return encrypted;
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}
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/**
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* 真正的加密过程
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*
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* @param key
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* @param src
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* @return
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* @throws Exception
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*/
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private static byte[] encrypt2Java(byte[] key, byte[] src) throws Exception {
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SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
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Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
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cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(new byte[cipher.getBlockSize()]));
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byte[] encrypted = cipher.doFinal(src);
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return encrypted;
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}
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/**
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* 真正的解密过程
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*
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* @param key
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* @param encrypted
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* @return
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* @throws Exception
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*/
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private static byte[] decrypt(byte[] key, byte[] encrypted) throws Exception {
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SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
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Cipher cipher = Cipher.getInstance("AES");
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cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(new byte[cipher.getBlockSize()]));
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byte[] decrypted = cipher.doFinal(encrypted);
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return decrypted;
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}
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public static String toHex(String txt) {
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return toHex(txt.getBytes());
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}
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public static String fromHex(String hex) {
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return new String(toByte(hex));
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}
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/**
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* 把16进制转化为字节数组
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*
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* @param hexString
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* @return
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*/
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public static byte[] toByte(String hexString) {
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int len = hexString.length() / 2;
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byte[] result = new byte[len];
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for (int i = 0; i < len; i++)
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result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2), 16).byteValue();
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return result;
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}
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/**
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* 二进制转字符,转成了16进制
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* 0123456789abcdefg
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*
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* @param buf
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* @return
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*/
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public static String toHex(byte[] buf) {
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if (buf == null)
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return "";
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StringBuffer result = new StringBuffer(2 * buf.length);
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for (int i = 0; i < buf.length; i++) {
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appendHex(result, buf[i]);
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}
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return result.toString();
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}
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private static void appendHex(StringBuffer sb, byte b) {
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sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));
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}
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/**
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* 初始化 AES Cipher
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*
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* @param sKey
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* @param cipherMode
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* @return
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*/
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public static Cipher initAESCipher(String sKey, int cipherMode) {
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// 创建Key gen
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// KeyGenerator keyGenerator = null;
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Cipher cipher = null;
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try {
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/*
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* keyGenerator = KeyGenerator.getInstance("AES");
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* keyGenerator.init(128, new SecureRandom(sKey.getBytes()));
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* SecretKey secretKey = keyGenerator.generateKey(); byte[]
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* codeFormat = secretKey.getEncoded(); SecretKeySpec key = new
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* SecretKeySpec(codeFormat, "AES"); cipher =
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* Cipher.getInstance("AES"); //初始化 cipher.init(cipherMode, key);
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*/
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byte[] rawKey = toMakekey(sKey, keyLenght, defaultV).getBytes();
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SecretKeySpec skeySpec = new SecretKeySpec(rawKey, "AES");
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cipher = Cipher.getInstance("AES");
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cipher.init(cipherMode, skeySpec, new IvParameterSpec(new byte[cipher.getBlockSize()]));
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} catch (NoSuchAlgorithmException e) {
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e.printStackTrace(); // To change body of catch statement use File |
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// Settings | File Templates.
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} catch (NoSuchPaddingException e) {
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e.printStackTrace(); // To change body of catch statement use File |
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// Settings | File Templates.
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} catch (InvalidKeyException e) {
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e.printStackTrace(); // To change body of catch statement use File |
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// Settings | File Templates.
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} catch (InvalidAlgorithmParameterException e) {
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e.printStackTrace();
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}
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return cipher;
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}
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/**
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* 对文件进行AES加密
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*
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* @param sourceFile
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* @param sKey
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* @return
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*/
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public static File encryptFile(File sourceFile, String toFile, String dir, String sKey) {
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// 新建临时加密文件
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File encrypfile = null;
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InputStream inputStream = null;
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OutputStream outputStream = null;
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try {
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inputStream = new FileInputStream(sourceFile);
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encrypfile = new File(dir + toFile);
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outputStream = new FileOutputStream(encrypfile);
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Cipher cipher = initAESCipher(sKey, Cipher.ENCRYPT_MODE);
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// 以加密流写入文件
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CipherInputStream cipherInputStream = new CipherInputStream(inputStream, cipher);
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byte[] cache = new byte[1024];
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int nRead = 0;
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while ((nRead = cipherInputStream.read(cache)) != -1) {
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outputStream.write(cache, 0, nRead);
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outputStream.flush();
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}
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cipherInputStream.close();
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} catch (FileNotFoundException e) {
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e.printStackTrace(); // To change body of catch statement use File |
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// Settings | File Templates.
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} catch (IOException e) {
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e.printStackTrace(); // To change body of catch statement use File |
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// Settings | File Templates.
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} finally {
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try {
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inputStream.close();
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} catch (IOException e) {
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e.printStackTrace(); // To change body of catch statement use
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// File | Settings | File Templates.
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}
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try {
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outputStream.close();
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} catch (IOException e) {
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e.printStackTrace(); // To change body of catch statement use
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// File | Settings | File Templates.
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}
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}
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return encrypfile;
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}
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/**
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* AES方式解密文件
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*
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* @param sourceFile
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* @return
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*/
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public static File decryptFile(File sourceFile, String toFile, String dir, String sKey) {
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File decryptFile = null;
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InputStream inputStream = null;
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OutputStream outputStream = null;
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try {
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decryptFile = new File(dir + toFile);
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Cipher cipher = initAESCipher(sKey, Cipher.DECRYPT_MODE);
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inputStream = new FileInputStream(sourceFile);
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outputStream = new FileOutputStream(decryptFile);
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CipherOutputStream cipherOutputStream = new CipherOutputStream(outputStream, cipher);
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byte[] buffer = new byte[1024];
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int r;
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while ((r = inputStream.read(buffer)) >= 0) {
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cipherOutputStream.write(buffer, 0, r);
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}
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cipherOutputStream.close();
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} catch (IOException e) {
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e.printStackTrace(); // To change body of catch statement use File |
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// Settings | File Templates.
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} finally {
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try {
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inputStream.close();
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} catch (IOException e) {
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e.printStackTrace(); // To change body of catch statement use
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// File | Settings | File Templates.
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}
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try {
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outputStream.close();
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} catch (IOException e) {
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e.printStackTrace(); // To change body of catch statement use
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// File | Settings | File Templates.
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}
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}
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return decryptFile;
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}
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}
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