C# Java DES加密解密
转自http://www.cnblogs.com/zhuiyi/archive/2013/04/01/2993201.html
最近被DES加解密弄得超级郁闷，我用C#的方法加密得到的密文老是跟客户给的Java的加密密文不同，找了很多资料都没有得到解决。直到看到上面的博文，才解决掉这个问题。这里mark一下，以免忘记！
先来个C#版的：
1 public class DESHelper 2 { 3 4 /// <summary> 5 /// DES加密算法 6 /// </summary> 7 /// <param name="encryptString">要加密的字符串</param> 8 /// <param name="sKey">加密码Key</param> 9 /// <returns>正确返回加密后的结果，错误返回源字符串</returns> 10 public static string ToDESEncrypt(string encryptString, string sKey) 11 { 12 try 13 { 14 15 byte[] keyBytes = Encoding.UTF8.GetBytes(sKey); 16 byte[] keyIV = keyBytes; 17 byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString); 18 19 DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider(); 20 21 // java 默认的是ECB模式，PKCS5padding；c#默认的CBC模式，PKCS7padding 所以这里我们默认使用ECB方式 22 desProvider.Mode = CipherMode.ECB; 23 MemoryStream memStream = new MemoryStream(); 24 CryptoStream crypStream = new CryptoStream(memStream, desProvider.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write); 25 26 crypStream.Write(inputByteArray, 0, inputByteArray.Length); 27 crypStream.FlushFinalBlock(); 28 return Convert.ToBase64String(memStream.ToArray()); 29 30 } 31 catch 32 { 33 return encryptString; 34 } 35 } 36 37 38 /// <summary> 39 /// DES解密算法 40 /// </summary> 41 /// <param name="decryptString">要解密的字符串</param> 42 /// <param name="sKey">加密Key</param> 43 /// <returns>正确返回加密后的结果，错误返回源字符串</returns> 44 public static string ToDESDecrypt(string decryptString, string sKey) 45 { 46 byte[] keyBytes = Encoding.UTF8.GetBytes(sKey); 47 byte[] keyIV = keyBytes; 48 byte[] inputByteArray = Convert.FromBase64String(decryptString); 49 50 DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider(); 51 52 // java 默认的是ECB模式，PKCS5padding；c#默认的CBC模式，PKCS7padding 所以这里我们默认使用ECB方式 53 desProvider.Mode = CipherMode.ECB; 54 MemoryStream memStream = new MemoryStream(); 55 CryptoStream crypStream = new CryptoStream(memStream, desProvider.CreateDecryptor(keyBytes, keyIV), CryptoStreamMode.Write); 56 57 crypStream.Write(inputByteArray, 0, inputByteArray.Length); 58 crypStream.FlushFinalBlock(); 59 return Encoding.Default.GetString(memStream.ToArray()); 60 61 } 62 }
再来个Java版的
1 public class DESHelper { 2 3 private byte[] desKey; 4 5 public DES(String desKey) { 6 this.desKey = desKey.getBytes(); 7 } 8 9 public byte[] desEncrypt(byte[] plainText) throws Exception { 10 SecureRandom sr = new SecureRandom(); 11 byte rawKeyData[] = desKey; 12 DESKeySpec dks = new DESKeySpec(rawKeyData); 13 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); 14 SecretKey key = keyFactory.generateSecret(dks); 15 Cipher cipher = Cipher.getInstance("DES"); 16 cipher.init(Cipher.ENCRYPT_MODE, key, sr); 17 byte data[] = plainText; 18 byte encryptedData[] = cipher.doFinal(data); 19 return encryptedData; 20 } 21 22 public byte[] desDecrypt(byte[] encryptText) throws Exception { 23 SecureRandom sr = new SecureRandom(); 24 byte rawKeyData[] = desKey; 25 DESKeySpec dks = new DESKeySpec(rawKeyData); 26 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); 27 SecretKey key = keyFactory.generateSecret(dks); 28 Cipher cipher = Cipher.getInstance("DES"); 29 cipher.init(Cipher.DECRYPT_MODE, key, sr); 30 byte encryptedData[] = encryptText; 31 byte decryptedData[] = cipher.doFinal(encryptedData); 32 return decryptedData; 33 } 34 35 public String encrypt(String input) throws Exception { 36 return base64Encode(desEncrypt(input.getBytes())); 37 } 38 39 public String decrypt(String input) throws Exception { 40 byte[] result = base64Decode(input); 41 return new String(desDecrypt(result)); 42 } 43 44 public static String base64Encode(byte[] s) { 45 if (s == null) 46 return null; 47 BASE64Encoder b = new sun.misc.BASE64Encoder(); 48 return b.encode(s); 49 } 50 51 public static byte[] base64Decode(String s) throws IOException { 52 if (s == null) 53 return null; 54 BASE64Decoder decoder = new BASE64Decoder(); 55 byte[] b = decoder.decodeBuffer(s); 56 return b; 57 } 58 59 }
