android开发分享AndroidAES加密工具类分享

  package com.example.aesdemo;    import java.io.unsupportedencodingexception;  import javax.crypto.cipher;  import javax.crypto.spec.secretkeyspec;     ///** aes对称加密解密类 **/  public class aeshelper {      // /** 算法/模式/填充 **/   private static final string ciphermode = "aes/ecb/pkcs5padding";      ///** 创建密钥 **/   private static secretkeyspec createkey(string password) {   byte[] data = null;   if (password == null) {    password = "";   }   stringbuffer sb = new stringbuffer(32);   sb.append(password);   while (sb.length() <32) {    sb.append("0");   }   if (sb.length() > 32) {    sb.setlength(32);   }      try {    data = sb.tostring().getbytes("utf-8");   } catch (unsupportedencodingexception e) {    e.printstacktrace();   }   return new secretkeyspec(data, "aes");   }      // /** 加密字节数据 **/   public static byte[] encrypt(byte[] content, string password) {   try {    secretkeyspec key = createkey(password);    system.out.println(key);    cipher cipher = cipher.getinstance(ciphermode);    cipher.init(cipher.encrypt_mode, key);    byte[] result = cipher.dofinal(content);    return result;   } catch (exception e) {    e.printstacktrace();   }   return null;   }      ///** 加密(结果为16进制字符串) **/   public static string encrypt(string content, string password) {   byte[] data = null;   try {    data = content.getbytes("utf-8");   } catch (exception e) {    e.printstacktrace();   }   data = encrypt(data, password);   string result = byte2hex(data);   return result;   }      // /** 解密字节数组 **/   public static byte[] decrypt(byte[] content, string password) {   try {    secretkeyspec key = createkey(password);    cipher cipher = cipher.getinstance(ciphermode);    cipher.init(cipher.decrypt_mode, key);    byte[] result = cipher.dofinal(content);    return result;   } catch (exception e) {    e.printstacktrace();   }   return null;   }      ///** 解密16进制的字符串为字符串 **/   public static string decrypt(string content, string password) {   byte[] data = null;   try {    data = hex2byte(content);   } catch (exception e) {    e.printstacktrace();   }   data = decrypt(data, password);   if (data == null)    return null;   string result = null;   try {    result = new string(data, "utf-8");   } catch (unsupportedencodingexception e) {    e.printstacktrace();   }   return result;   }      // /** 字节数组转成16进制字符串 **/   public static string byte2hex(byte[] b) { // 一个字节的数，   stringbuffer sb = new stringbuffer(b.length * 2);   string tmp = "";   for (int n = 0; n 

  package com.example.aesdemo;    import android.os.bundle;  import android.app.activity;  import android.view.menu;  import android.util.log;     public class mainactivity extends activity {  		   protected void oncreate(bundle savedinstancestate) {   		super.oncreate(savedinstancestate);   		setcontentview(r.layout.activity_main);  	  	 string masterpassword = "a";   	 string originaltext = "于";     	 try {   	  string encryptingcode = aeshelper.encrypt(originaltext,masterpassword);   //	  system.out.println("加密结果为 " + encryptingcode);   	  log.i("加密结果为 ",encryptingcode);   	  string decryptingcode = aeshelper.decrypt(encryptingcode,masterpassword);   //	  system.out.println("解密结果为 " + decryptingcode);   	  log.i("解密结果",decryptingcode);   	  } catch (exception e) {   	  // todo auto-generated catch block   	  e.printstacktrace();   	 } 	  	}    	@override  	public boolean oncreateoptionsmenu(menu menu) {  		// inflate the menu; this adds items to the action bar if it is present.  		getmenuinflater().inflate(r.menu.main, menu);  		return true;  	}  }

  09-19 10:41:05.467: i/加密结果为(707): e55c24701f6380478e1940addfd08d22  09-19 10:41:05.467: i/解密结果(707): 于