加解密1-流
加密：
1 /// <summary> 2 /// 使用指定的加密算法加密流 3 /// </summary> 4 /// <param name="inStream"></param> 5 /// <param name="provider"></param> 6 /// <returns>加密后的流</returns> 7 public static Stream GetEncryptedStream(Stream inStream, SymmetricAlgorithm provider) 8 { 9 MemoryStream outStream = new MemoryStream(); 10 //以加密方式写入到outStream 11 CryptoStream encryptStream = new CryptoStream(outStream, provider.CreateEncryptor(), CryptoStreamMode.Write); 12 13 int numBytes; 14 byte[] inputBytes = new byte[1024]; 15 while ((numBytes = inStream.Read(inputBytes, 0, inputBytes.Length)) != 0) 16 { 17 encryptStream.Write(inputBytes, 0, numBytes); 18 } 19 encryptStream.FlushFinalBlock(); 20 21 //回到输出的流的起点 22 outStream.Position = 0; 23 24 //加密后的数据 25 return outStream; 26 } 27 28 29 /// <summary> 30 /// 使用指定的加密算法加密流 31 /// </summary> 32 /// <param name="inStream"></param> 33 /// <param name="provider"></param> 34 /// <returns>加密后的流</returns> 35 public static Stream GetEncryptedStream(Stream inStream, SymmetricAlgorithm provider) 36 { 37 MemoryStream outStream = new MemoryStream(); 38 //以加密方式读取inStream 39 CryptoStream encryptStream = new CryptoStream(inStream, provider.CreateEncryptor(), CryptoStreamMode.Read); 40 41 int numBytes; 42 byte[] inputBytes = new byte[1024]; 43 while ((numBytes = encryptStream.Read(inputBytes, 0, inputBytes.Length)) != 0) 44 { 45 outStream.Write(inputBytes, 0, numBytes); 46 } 47 //回到输出的流的起点 48 outStream.Position = 0; 49 50 //加密后的数据 51 return outStream; 52 }
解密：
1 /// <summary> 2 /// 使用指定的算法提供器解密流 3 /// </summary> 4 /// <param name="inStream"></param> 5 /// <param name="provider"></param> 6 /// <returns>解密后的流</returns> 7 public static Stream GetDecryptedStream(Stream inStream,SymmetricAlgorithm provider) 8 { 9 MemoryStream outStream = new MemoryStream(); 10 //以解密方式读取inStream 11 CryptoStream decryptStream = new CryptoStream(inStream, provider.CreateDecryptor(), CryptoStreamMode.Read); 12 13 int numBytes; 14 byte[] inputBytes = new byte[_bufferSize]; 15 while ((numBytes = decryptStream.Read(inputBytes,0,inputBytes.Length)) !=0) 16 { 17 outStream.Write(inputBytes, 0, numBytes); 18 } 19 20 //回到输出的流的起点 21 outStream.Position = 0; 22 23 return outStream; 24 } 25 26 /// <summary> 27 /// 使用指定的算法提供器解密流 28 /// </summary> 29 /// <param name="inStream"></param> 30 /// <param name="provider"></param> 31 /// <returns>解密后的流</returns> 32 public static Stream GetDecryptedStream(Stream inStream,SymmetricAlgorithm provider) 33 { 34 MemoryStream outStream = new MemoryStream(); 35 //以解密方式写入outStream 36 CryptoStream decryptStream = new CryptoStream(outStream , provider.CreateDecryptor(), CryptoStreamMode.Write); 37 38 int numBytes; 39 byte[] inputBytes = new byte[_bufferSize]; 40 while ((numBytes = inStream.Read(inputBytes,0,inputBytes.Length)) !=0) 41 { 42 decryptStream.Write(inputBytes, 0, numBytes); 43 } 44 decryptStream.FlushFinalBlock(); 45 //回到输出的流的起点 46 outStream.Position = 0; 47 48 return outStream; 49 }
