Android DES加密的CBC模式加密解密和ECB模式加密解密

DES加密共有四种模式：电子密码本模式（ECB）、加密分组链接模式（CBC）、加密反馈模式（CFB）和输出反馈模式（OFB）。

CBC模式加密：

import java.security.Key;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import com.sun.org.apache.xml.internal.security.utils.Base64;

public class DesCbcUtil {
public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding";

/**
* 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 CryptException 异常
*/
public static String encode(String key, String data) throws Exception
{
return encode(key, data.getBytes());
}

/**
* 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 CryptException 异常
*/
public static String encode(String key, byte[] data) throws Exception
{
try { 
byte[] ivbyte = { 1, 2, 3, 4, 5, 6, 7, 8 }; 
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(ivbyte);
AlgorithmParameterSpec paramSpec = iv;
cipher.init(Cipher.ENCRYPT_MODE, secretKey, paramSpec);

byte[] bytes = cipher.doFinal(data);

return Base64.encode(bytes);
} catch (Exception e) {
throw new Exception(e);
}
}

/**
* 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 static byte[] decode(String key, byte[] data) throws Exception
{
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 cipher.doFinal(data);
} catch (Exception e) {
throw new Exception(e);
}
}

/**
* 获取编码后的值
* 
* @param key
* @param data
* @return
* @throws Exception
*/
public static String decodeValue(String key, String data) {
byte[] datas;
String value = null;
try {
if (System.getProperty("os.name") != null
&& (System.getProperty("os.name").equalsIgnoreCase("sunos") ||
System
.getProperty("os.name").equalsIgnoreCase("linux"))) {
datas = decode(key, Base64.decode(data));
} else {
datas = decode(key, Base64.decode(data));
}

value = new String(datas);
} catch (Exception e) {
value = "";
}
return value;
}

}

ECB模式加密：

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import android.util.Base64;

public class DesEcbUtil {

public static final String ALGORITHM_DES = "DES/ECB/PKCS5Padding";

/**
* 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 CryptException  异常
*/
public static String encode(String key, String data) throws Exception {
return encode(key, data.getBytes());
}

/**
* 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 CryptException 异常
*/
public static String encode(String key, byte[] data) throws Exception {
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);
cipher.init(Cipher.ENCRYPT_MODE, secretKey);

byte[] bytes = cipher.doFinal(data);

return Base64.encodeToString(bytes, 3);
} catch (Exception e) {
throw new Exception(e);
}
}

/**
* 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 static byte[] decode(String key, byte[] data) throws Exception {
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);
cipher.init(Cipher.DECRYPT_MODE, secretKey);
return cipher.doFinal(data);
} catch (Exception e) {
throw new Exception(e);
}
}

/**
* 获取编码后的值
* 
* @param key
* @param data
* @return
* @throws Exception
*/
public static String decodeValue(String key, String data) {
byte[] datas;
String value = null;
try {
if (System.getProperty("os.name") != null
&& (System.getProperty("os.name").equalsIgnoreCase("sunos") || System
.getProperty("os.name").equalsIgnoreCase("linux"))) {
datas = decode(key, Base64.decode(data, 3));
} else {
datas = decode(key, Base64.decode(data, 3));
}

value = new String(datas);
} catch (Exception e) {
value = "";
}
return value;
}
}
测试（CBC模式的测试和ECB的一样）：
try {
//待加密内容url
String str = "";

String pwdKey = "moshapp"; 
String pwdKeyMD5 = MD5Util.encode(pwdKey);
System.out.println("pwdKeyMD5：" + pwdKeyMD5);
String encodeStr = DesEcbUtil.encode(pwdKeyMD5, str);
String decodeStr = DesEcbUtil.decodeValue(pwdKeyMD5, encodeStr);
System.out.println("加密前的字符串：" + str);
System.out.println("加密后的字符串：" + encodeStr);
System.out.println("解密后的字符串：" + decodeStr);
// URL转义
final String encodedURL = URLEncoder.encode(encodeStr, "UTF-8");

// URL urlStr = new URL(encodedURL);
System.out.println("转义后的字符串：" + encodedURL);
} catch (Exception e) {
e.printStackTrace();
}

参考：

http://blog.csdn.net/randyjiawenjie/article/details/6617225  Android平台和java平台 DES加密解密互通程序及其不能互通的原因

http://hi.baidu.com/hpyfei/item/ca990cff5ce7b217ff358263  Android与PHP互通的DES加密解密

http://www.linuxidc.com/Linux/2011-08/41866.htm  Android客户端与服务器端通过DES加密认证