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using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace Gestor.Common.Helpers;
public static class EncryptionHelper
{
private static readonly byte[] Salt = new byte[16]
{
38, 220, 255, 0, 173, 237, 122, 238, 197, 254,
7, 175, 77, 8, 34, 60
};
private static readonly string EncryptionKey = $"aGG3r{1012}#w3BDz$";
public static string Encrypt(this string plain)
{
return Convert.ToBase64String(Encoding.UTF8.GetBytes(plain).EncryptBytes());
}
public static byte[] EncryptBytes(this byte[] plainTextBytes)
{
using Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes(EncryptionKey, Salt);
using Rijndael rijndael = Rijndael.Create();
rijndael.Key = rfc2898DeriveBytes.GetBytes(32);
rijndael.IV = rfc2898DeriveBytes.GetBytes(16);
using MemoryStream memoryStream = new MemoryStream();
using CryptoStream cryptoStream = new CryptoStream(memoryStream, rijndael.CreateEncryptor(), CryptoStreamMode.Write);
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
cryptoStream.FlushFinalBlock();
return memoryStream.ToArray();
}
public static string Decrypt(this string cipher)
{
if (string.IsNullOrEmpty(cipher))
{
return null;
}
try
{
byte[] array = Convert.FromBase64String(cipher);
if (array.Length < 16)
{
return cipher;
}
byte[] array2 = array.DecryptBytes();
return (array2 == null) ? cipher : Encoding.UTF8.GetString(array2);
}
catch (Exception)
{
return cipher;
}
}
public static byte[] DecryptBytes(this byte[] plainTextBytes)
{
try
{
using Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes(EncryptionKey, Salt);
using Rijndael rijndael = Rijndael.Create();
rijndael.Key = rfc2898DeriveBytes.GetBytes(32);
rijndael.IV = rfc2898DeriveBytes.GetBytes(16);
using MemoryStream memoryStream = new MemoryStream();
using CryptoStream cryptoStream = new CryptoStream(memoryStream, rijndael.CreateDecryptor(), CryptoStreamMode.Write);
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
cryptoStream.FlushFinalBlock();
return memoryStream.ToArray();
}
catch (Exception)
{
return null;
}
}
}
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