<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="加密和解密"
/>
<EditText
android:id="@+id/jiami"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入要加密的字符"
/>
<Button
android:id="@+id/DESjiami"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="DES加密"
/>
<Button
android:id="@+id/MD5jiami"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="MD5加密"
/>
<Button
android:id="@+id/UTF_8jiami"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="UTF-8加密"
/>
<Button
android:id="@+id/Base64jiami"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Base64加密"
/>
<EditText
android:id="@+id/jiemi"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入要解密的字符"
/>
<Button
android:id="@+id/DESjiemi"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="DES解密"
/>
<Button
android:id="@+id/UTF_8jiemi"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="UTF-8解密"
/>
<Button
android:id="@+id/Base64jiemi"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Base64解密"
/>
</LinearLayout>
代码部分：
package com.example.administrator.decryptionandencryption;
import android.app.Activity;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.security.Key;
import java.security.MessageDigest;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import android.os.Bundle;
import android.util.Base64;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener {
private TextView xianshi;
private EditText jiami;
private EditText jiemi;
private Button dESjiami;
private Button mD5jiami;
private Button uTF_8jiami;
private Button base64jiami;
private Button dESjiemi;
private Button uTF_8jiemi;
private Button base64jiemi;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
xianshi = (TextView) findViewById(R.id.text);
jiami = (EditText) findViewById(R.id.jiami);
jiemi = (EditText) findViewById(R.id.jiemi);
dESjiami = (Button) findViewById(R.id.DESjiami);
mD5jiami = (Button) findViewById(R.id.MD5jiami);
uTF_8jiami = (Button) findViewById(R.id.UTF_8jiami);
base64jiami = (Button) findViewById(R.id.Base64jiami);
dESjiemi = (Button) findViewById(R.id.DESjiemi);
uTF_8jiemi = (Button) findViewById(R.id.UTF_8jiemi);
base64jiemi = (Button) findViewById(R.id.Base64jiemi);
dESjiami.setOnClickListener(this);
mD5jiami.setOnClickListener(this);
uTF_8jiami.setOnClickListener(this);
base64jiami.setOnClickListener(this);
dESjiemi.setOnClickListener(this);
uTF_8jiemi.setOnClickListener(this);
base64jiemi.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String jiami1 = jiami.getText().toString();
String jiemi1 = jiemi.getText().toString();
switch (v.getId()) {
//DES加密
case R.id.DESjiami:
String desjia = encrypt(jiami1);
xianshi.setText(desjia);
break;
//MD5加密
case R.id.MD5jiami:
String md5jia = MD5(jiami1, true);
xianshi.setText(md5jia);
break;
//UTF_8 加密
case R.id.UTF_8jiami:
try {
String utf_8jia = URLEncoder.encode(jiami1, "utf-8");
xianshi.setText(utf_8jia);
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
//BASe64加密
case R.id.Base64jiami:
byte[] bs = jiami1.getBytes();
String base64jia = new String(Base64.encode(bs, Base64.DEFAULT));
xianshi.setText(base64jia);
break;
//DES解密
case R.id.DESjiemi:
String desjie = decrypt(jiemi1);
xianshi.setText(desjie);
break;
//UTF_8解密
case R.id.UTF_8jiemi:
try {
String utf_8jie = URLDecoder.decode(jiemi1, "utf-8");
xianshi.setText(utf_8jie);
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
//Base64解密
case R.id.Base64jiemi:
String base64jie = new String(Base64.decode(jiemi1.getBytes(), Base64.DEFAULT));
xianshi.setText(base64jie);
break;
}
}
/**
* MD5加密
*
* @param str
* @param isUp true是否大写
* @return
*/
public static String MD5(String str, boolean isUp) {
MessageDigest md5 = null;
try {
md5 = MessageDigest.getInstance("MD5");
} catch (Exception e) {
e.printStackTrace();
return "";
}
char[] charArray = str.toCharArray();
byte[] byteArray = new byte[charArray.length];
for (int i = 0; i < charArray.length; i++) {
byteArray[i] = (byte) charArray[i];
}
byte[] md5Bytes = md5.digest(byteArray);
StringBuffer hexValue = new StringBuffer();
for (int i = 0; i < md5Bytes.length; i++) {
int val = (md5Bytes[i]) & 0xff;
if (val < 16) {
hexValue.append("0");
}
hexValue.append(Integer.toHexString(val));
}
if (isUp) {
return (hexValue.toString()).toUpperCase();
} else {
return hexValue.toString();
}
}
public String ALGORITHM_DES = "DES/CBC/PKCS5Padding";
public String DESKEY = "QpOiUnYbVp3bB73Fsn7O12CX";
/**
* DES加密方式
*
* @param data
* @return
*/
public String encrypt(String data) {
String str = encrypt(DESKEY, data);
return str;
}
/**
* DES解密方式
*
* @param data
* @return
*/
public String decrypt(String data) {
String str = decrypt(DESKEY, data);
return str;
}
/**
* DES算法，加密
*
* @param data 待加密字符串
* @param key 加密私钥，长度不能够小于8位
* @return 加密后的字节数组，一般结合Base64编码使用
* @throws InvalidAlgorithmParameterException
* @throws Exception
*/
public String encrypt(String key, String data) {
if (data == null)
return null;
try {
DESKeySpec dks = new DESKeySpec(key.getBytes());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
// key的长度不能够小于8位字节
Key secretKey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());
AlgorithmParameterSpec paramSpec = iv;
cipher.init(Cipher.ENCRYPT_MODE, secretKey, paramSpec);
byte[] bytes = cipher.doFinal(data.getBytes());
return byte2hex(bytes);
} catch (Exception e) {
e.printStackTrace();
return data;
}
}
/**
* DES算法，解密
*
* @param data 待解密字符串
* @param key 解密私钥，长度不能够小于8位
* @return 解密后的字节数组
* @throws Exception 异常
*/
public String decrypt(String key, String data) {
if (data == null)
return null;
try {
DESKeySpec dks = new DESKeySpec(key.getBytes());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
// key的长度不能够小于8位字节
Key secretKey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());
AlgorithmParameterSpec paramSpec = iv;
cipher.init(Cipher.DECRYPT_MODE, secretKey, paramSpec);
return new String(cipher.doFinal(hex2byte(data.getBytes())));
} catch (Exception e) {
e.printStackTrace();
return data;
}
}
/**
* 二行制转字符串
*
* @param b
* @return
*/
private static String byte2hex(byte[] b) {
StringBuilder hs = new StringBuilder();
String stmp;
for (int n = 0; b != null && n < b.length; n++) {
stmp = Integer.toHexString(b[n] & 0XFF);
if (stmp.length() == 1)
hs.append('0');
hs.append(stmp);
}
return hs.toString().toUpperCase();
}
private static byte[] hex2byte(byte[] b) {
if ((b.length % 2) != 0)
throw new IllegalArgumentException();
byte[] b2 = new byte[b.length / 2];
for (int n = 0; n < b.length; n += 2) {
String item = new String(b, n, 2);
b2[n / 2] = (byte) Integer.parseInt(item, 16);
}
return b2;
}
}