package com.example.aes;
import java.io.UnsupportedEncodingException;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
/**
* AES加密解密算法
*/
public class AESHelper {
/** 算法/模式/填充 **/
private static final String CipherMode = "AES/CBC/PKCS5Padding";
/** 创建密钥 **/
private static SecretKeySpec createKey(String key) {
byte[] data = null;
if (key == null) {
key = "";
}
StringBuffer sb = new StringBuffer(16);
sb.append(key);
while (sb.length() < 16) {
sb.append("0");
}
if (sb.length() > 16) {
sb.setLength(16);
}
try {
data = sb.toString().getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return new SecretKeySpec(data, "AES");
}
private static IvParameterSpec createIV(String password) {
byte[] data = null;
if (password == null) {
password = "";
}
StringBuffer sb = new StringBuffer(16);
sb.append(password);
while (sb.length() < 16) {
sb.append("0");
}
if (sb.length() > 16) {
sb.setLength(16);
}
try {
data = sb.toString().getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return new IvParameterSpec(data);
}
/** 加密字节数据 **/
public static byte[] encrypt(byte[] content, String password, String iv) {
try {
SecretKeySpec key = createKey(password);
Cipher cipher = Cipher.getInstance(CipherMode);
cipher.init(Cipher.ENCRYPT_MODE, key, createIV(iv));
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, String iv) {
byte[] data = null;
try {
data = content.getBytes("UTF-8");
} catch (Exception e) {
e.printStackTrace();
}
data = encrypt(data, password, iv);
String result = byte2hex(data);
return result;
}
/** 解密字节数组 **/
public static byte[] decrypt(byte[] content, String password, String iv) {
try {
SecretKeySpec key = createKey(password);
Cipher cipher = Cipher.getInstance(CipherMode);
cipher.init(Cipher.DECRYPT_MODE, key, createIV(iv));
byte[] result = cipher.doFinal(content);
return result;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/** 解密(输出结果为字符串) **/
public static String decrypt(String content, String password, String iv) {
byte[] data = null;
try {
data = hex2byte(content);
} catch (Exception e) {
e.printStackTrace();
}
data = decrypt(data, password, iv);
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 < b.length; n++) {
// 整数转成十六进制表示
tmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
if (tmp.length() == 1) {
sb.append("0");
}
sb.append(tmp);
}
return sb.toString().toUpperCase(); // 转成大写
}
/** 将hex字符串转换成字节数组 **/
private static byte[] hex2byte(String inputString) {
if (inputString == null || inputString.length() < 2) {
return new byte[0];
}
inputString = inputString.toLowerCase();
int l = inputString.length() / 2;
byte[] result = new byte[l];
for (int i = 0; i < l; ++i) {
String tmp = inputString.substring(2 * i, 2 * i + 2);
result[i] = (byte) (Integer.parseInt(tmp, 16) & 0xFF);
}
return result;
}
}
------------------------------------------------------------
public class MainActivity extends Activity implements OnClickListener {
private Button mJiami, mJiemi;
private EditText mName;
private String KEY="fe8f95cb0f968676572ab9f46d8a261b";
private String IV ="0F968676572AB9F4";
private String name;
String aes;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
mName = (EditText) findViewById(R.id.editText1);
name = mName.getText().toString().trim();
mJiami = (Button) findViewById(R.id.button1);
mJiemi = (Button) findViewById(R.id.button2);
mJiami.setOnClickListener(this);
mJiemi.setOnClickListener(this);
}
@Override
public void onClick(View v) {
String help = null;
switch (v.getId()) {
case R.id.button1:
try {
aes = AESHelper.encrypt(name, KEY, IV);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Toast.makeText(this, "加密后值为："+aes, 0).show();
break;
case R.id.button2:
try {
help = AESHelper.decrypt(aes, KEY, IV);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(help.length()==0){
Toast.makeText(this, "解密失败！", 0).show();
}else{
Toast.makeText(this, help, 0).show();
}
break;
default:
break;
}
}
}
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