C#簡單的加密類

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1.加密

 1 public class EncryptHepler { 2         // 驗值  3         static string saltValue = "XXXX"; 4         // 密碼值  5         static string pwdValue = "XXXX"; 6   7         /// <summary> 8         /// 加密 9         /// </summary>10         public static string Encrypt( string input ) {11             byte[ ] data = System.Text.UTF8Encoding.UTF8.GetBytes( input );12             byte[ ] salt = System.Text.UTF8Encoding.UTF8.GetBytes( saltValue );13  14             // AesManaged - 進階加密標準(AES) 對稱演算法的管理類 15             System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged( );16             // Rfc2898DeriveBytes - 通過使用基於 HMACSHA1 的偽隨機數產生器，實現基於密碼的金鑰衍生函數 (Key Derivation Function) (PBKDF2 - 一種基於密碼的密鑰派生函數) 17             // 通過 密碼 和 salt 衍生金鑰 18             System.Security.Cryptography.Rfc2898DeriveBytes rfc = new System.Security.Cryptography.Rfc2898DeriveBytes( pwdValue, salt );19  20             aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;21             aes.KeySize = aes.LegalKeySizes[0].MaxSize;22             aes.Key = rfc.GetBytes( aes.KeySize / 8 );23             aes.IV = rfc.GetBytes( aes.BlockSize / 8 );24  25             // 用當前的 Key 屬性和初始化向量 IV 建立對稱式加密器對象 26             System.Security.Cryptography.ICryptoTransform encryptTransform = aes.CreateEncryptor( );27             // 加密後的輸出資料流 28             System.IO.MemoryStream encryptStream = new System.IO.MemoryStream( );29             // 將加密後的目標流（encryptStream）與加密轉換（encryptTransform）相串連 30             System.Security.Cryptography.CryptoStream encryptor = new System.Security.Cryptography.CryptoStream31                 ( encryptStream, encryptTransform, System.Security.Cryptography.CryptoStreamMode.Write );32  33             // 將一個位元組序列寫入當前 CryptoStream （完成加密的過程）34             encryptor.Write( data, 0, data.Length );35             encryptor.Close( );36             // 將加密後所得到的流轉換成位元組數組，再用Base64編碼將其轉換為字串 37             string encryptedString = Convert.ToBase64String( encryptStream.ToArray( ) );38             return encryptedString;39         }

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2.解密

 1 /// <summary> 2         /// 解密 3         /// </summary> 4         public static string Decrypt( string input ) { 5             byte[ ] encryptBytes = Convert.FromBase64String( input ); 6             byte[ ] salt = Encoding.UTF8.GetBytes( saltValue ); 7             System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged( ); 8             System.Security.Cryptography.Rfc2898DeriveBytes rfc = new System.Security.Cryptography.Rfc2898DeriveBytes( pwdValue, salt ); 9  10             aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;11             aes.KeySize = aes.LegalKeySizes[0].MaxSize;12             aes.Key = rfc.GetBytes( aes.KeySize / 8 );13             aes.IV = rfc.GetBytes( aes.BlockSize / 8 );14  15             // 用當前的 Key 屬性和初始化向量 IV 建立對稱解密器對象 16             System.Security.Cryptography.ICryptoTransform decryptTransform = aes.CreateDecryptor( );17             // 解密後的輸出資料流 18             System.IO.MemoryStream decryptStream = new System.IO.MemoryStream( );19  20             // 將解密後的目標流（decryptStream）與解密轉換（decryptTransform）相串連 21             System.Security.Cryptography.CryptoStream decryptor = new System.Security.Cryptography.CryptoStream(22                 decryptStream, decryptTransform, System.Security.Cryptography.CryptoStreamMode.Write );23             // 將一個位元組序列寫入當前 CryptoStream （完成解密的過程） 24             decryptor.Write( encryptBytes, 0, encryptBytes.Length );25             decryptor.Close( );26  27             // 將解密後所得到的流轉換為字串 28             byte[ ] decryptBytes = decryptStream.ToArray( );29             string decryptedString = UTF8Encoding.UTF8.GetString( decryptBytes, 0, decryptBytes.Length );30             return decryptedString;31         }32     }//class end

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