android&php 加密解密

from://http://blog.csdn.net/hecker385/article/details/6717647

分类： Php Android2011-08-25 11:15 556人阅读评论(2) 收藏举报

android加密phplayoutexceptionstring

MyCryptActivity.java

[java] view plaincopyprint?

package com.test.crypt;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MyCryptActivity extends Activity {
/** Called when the activity is first created. */
private EditText plainTextbefore, plaintextafter, ciphertext;
private Button button01;
private MCrypt mcrypt;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
plainTextbefore = (EditText)findViewById(R.id.EditText01);
ciphertext = (EditText)findViewById(R.id.EditText02);
plaintextafter = (EditText)findViewById(R.id.EditText03);
button01=(Button)findViewById(R.id.Button01);
plainTextbefore.setHint(“请输入要加密的字符串”);
button01.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String plainText = plainTextbefore.getText().toString();
mcrypt = new MCrypt();
try {
String encrypted = MCrypt.bytesToHex( mcrypt.encrypt(plainText));
String decrypted = new String( mcrypt.decrypt( encrypted ) );
ciphertext.setText(encrypted);
plaintextafter.setText(decrypted);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
}

MCrypt.java

[java] view plaincopyprint?

package com.test.crypt;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class MCrypt {
private String iv = “0123456789123456”;//
private IvParameterSpec ivspec;
private SecretKeySpec keyspec;
private Cipher cipher;
private String SecretKey = “0123456789abcdef”;//secretKey
public MCrypt()
{
ivspec = new IvParameterSpec(iv.getBytes());//偏移量
keyspec = new SecretKeySpec(SecretKey.getBytes(), “AES”);//生成密钥
try {
cipher = Cipher.getInstance(“AES/CBC/NoPadding”);
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchPaddingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public byte[] encrypt(String text) throws Exception
{
if(text == null || text.length() == 0)
throw new Exception(“Empty string”);
byte[] encrypted = null;
try {
cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
encrypted = cipher.doFinal(padString(text).getBytes());
} catch (Exception e)
{
throw new Exception(“[encrypt] “ + e.getMessage());
}
return encrypted;
}
public byte[] decrypt(String code) throws Exception
{
if(code == null || code.length() == 0)
throw new Exception(“Empty string”);
byte[] decrypted = null;
try {
cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);//<span style=”font-family: Simsun;font-size:16px; “>用密钥和一组算法参数初始化此 Cipher。</span>
decrypted = cipher.doFinal(hexToBytes(code));
} catch (Exception e)
{
throw new Exception(“[decrypt] “ + e.getMessage());
}
return decrypted;
}
public static String bytesToHex(byte[] data)
{
if (data==null)
{
return null;
}
int len = data.length;
String str = “”;
for (int i=0; i<len; i++) {
if ((data[i]&0xFF)<16)
str = str + “0” + java.lang.Integer.toHexString(data[i]&0xFF);
else
str = str + java.lang.Integer.toHexString(data[i]&0xFF);
}
return str;
}
public static byte[] hexToBytes(String str) {
if (str==null) {
return null;
} else if (str.length() < 2) {
return null;
} else {
int len = str.length() / 2;
byte[] buffer = new byte[len];
for (int i=0; i<len; i++) {
buffer[i] = (byte) Integer.parseInt(str.substring(i*2,i*2+2),16);
}
return buffer;
}
}
private static String padString(String source)
{
char paddingChar = ‘ ‘;
int size = 16;
int x = source.length() % size;
int padLength = size – x;
for (int i = 0; i < padLength; i++)
{
source += paddingChar;
}
return source;
}
}