Android DES加密的CBC模式加密解密和ECB模式加密解密

DES加密共有四種模式：電子密碼本模式（ECB）、加密分組鏈接模式（CBC）、加密反饋模式（CFB）和輸出反饋模式（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 加密私鑰，長度不能夠小於8位 * @return 加密後的字節數組，一般結合Base64編碼使用 * @throws CryptException 異常 */ 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 加密私鑰，長度不能夠小於8位 * @return 加密後的字節數組，一般結合Base64編碼使用 * @throws CryptException 異常 */ 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的長度不能夠小於8位字節 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 解密私鑰，長度不能夠小於8位 * @return 解密後的字節數組 * @throws Exception 異常 */ public static byte[] decode(String key, byte[] data) throws Exception { try { DESKeySpec dks = new DESKeySpec(key.getBytes()); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); // key的長度不能夠小於8位字節 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); } }   /** * 獲取編碼後的值 *  * @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 加密私鑰，長度不能夠小於8位 * @return 加密後的字節數組，一般結合Base64編碼使用 * @throws CryptException  異常 */ 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 加密私鑰，長度不能夠小於8位 * @return 加密後的字節數組，一般結合Base64編碼使用 * @throws CryptException 異常 */ public static String encode(String key, byte[] data) throws Exception { try { DESKeySpec dks = new DESKeySpec(key.getBytes());   SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); // key的長度不能夠小於8位字節 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 解密私鑰，長度不能夠小於8位 * @return 解密後的字節數組 * @throws Exception 異常 */ public static byte[] decode(String key, byte[] data) throws Exception { try { DESKeySpec dks = new DESKeySpec(key.getBytes()); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); // key的長度不能夠小於8位字節 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); } }   /** * 獲取編碼後的值 *  * @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; } } 測試（CBC模式的測試和ECB的一樣）： try { //待加密內容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("加密後的字符串：" + encodeStr); System.out.println("解密後的字符串：" + decodeStr); // URL轉義 final String encodedURL = URLEncoder.encode(encodeStr, "UTF-8"); // URL urlStr = new URL(encodedURL); System.out.println("轉義後的字符串：" + encodedURL); } catch (Exception e) { e.printStackTrace(); }