Android DES加密的CBC和ECB加密解密模式

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";

public static String encode(String key, String data) throws Exception {

return encode(key, data.getBytes());

}

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);

}

}

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);

}

}

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;

}

}

复制代码
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";

public static String encode(String key, String data) throws Exception {

return encode(key, data.getBytes());

}

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);

}

}

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);

}

}

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();

}