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using System;
using System.IO;
using System.Runtime.CompilerServices;
using System.Security.Cryptography;
using System.Text;
namespace Gestor.Common.Helpers
{
public static class EncryptionHelper
{
private readonly static byte[] Salt;
private readonly static string EncryptionKey;
static EncryptionHelper()
{
EncryptionHelper.Salt = new byte[] { 38, 220, 255, 0, 173, 237, 122, 238, 197, 254, 7, 175, 77, 8, 34, 60 };
EncryptionHelper.EncryptionKey = string.Format("aGG3r{0}#w3BDz$", 1012);
}
public static string Decrypt(this string cipher)
{
string str;
if (string.IsNullOrEmpty(cipher))
{
return null;
}
try
{
byte[] numArray = Convert.FromBase64String(cipher);
if ((int)numArray.Length >= 16)
{
byte[] numArray1 = numArray.DecryptBytes();
str = (numArray1 == null ? cipher : Encoding.UTF8.GetString(numArray1));
}
else
{
str = cipher;
}
}
catch (Exception exception)
{
str = cipher;
}
return str;
}
public static byte[] DecryptBytes(this byte[] plainTextBytes)
{
byte[] array;
try
{
using (Rfc2898DeriveBytes rfc2898DeriveByte = new Rfc2898DeriveBytes(EncryptionHelper.EncryptionKey, EncryptionHelper.Salt))
{
using (Rijndael bytes = Rijndael.Create())
{
bytes.Key = rfc2898DeriveByte.GetBytes(32);
bytes.IV = rfc2898DeriveByte.GetBytes(16);
using (MemoryStream memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, bytes.CreateDecryptor(), CryptoStreamMode.Write))
{
cryptoStream.Write(plainTextBytes, 0, (int)plainTextBytes.Length);
cryptoStream.FlushFinalBlock();
array = memoryStream.ToArray();
}
}
}
}
}
catch (Exception exception)
{
array = null;
}
return array;
}
public static string Encrypt(this string plain)
{
return Convert.ToBase64String(Encoding.UTF8.GetBytes(plain).EncryptBytes());
}
public static byte[] EncryptBytes(this byte[] plainTextBytes)
{
byte[] array;
using (Rfc2898DeriveBytes rfc2898DeriveByte = new Rfc2898DeriveBytes(EncryptionHelper.EncryptionKey, EncryptionHelper.Salt))
{
using (Rijndael bytes = Rijndael.Create())
{
bytes.Key = rfc2898DeriveByte.GetBytes(32);
bytes.IV = rfc2898DeriveByte.GetBytes(16);
using (MemoryStream memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, bytes.CreateEncryptor(), CryptoStreamMode.Write))
{
cryptoStream.Write(plainTextBytes, 0, (int)plainTextBytes.Length);
cryptoStream.FlushFinalBlock();
array = memoryStream.ToArray();
}
}
}
}
return array;
}
}
}
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