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using System.IO;
using System.Text;
using System.Security.Cryptography;
using System;
using SimpleValidator.Extensions;
namespace Tango.Core.Cryptography
{
/// <summary>
/// Represents an Rfc2898 <see cref="ICryptographer">Cryptographer</see>.
/// </summary>
/// <seealso cref="Tango.Core.Cryptography.ICryptographer" />
public class Rfc2898Cryptographer : ICryptographer
{
/// <summary>
/// Decrypts the specified text.
/// </summary>
/// <param name="text">The text.</param>
/// <returns></returns>
public string Decrypt(string text)
{
return Decrypt(text, Properties.Resources.EncryptionPassword);
}
/// <summary>
/// Decrypts the specified text using the specified pass key.
/// </summary>
/// <param name="text">The text.</param>
/// <param name="key">The key.</param>
/// <returns></returns>
public string Decrypt(string text, string key)
{
if (text.IsNullOrWhiteSpace()) return text;
string EncryptionKey = key;
text = text.Replace(" ", "+");
byte[] cipherBytes = Convert.FromBase64String(text);
using (Aes encryptor = Aes.Create())
{
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
encryptor.Key = pdb.GetBytes(32);
encryptor.IV = pdb.GetBytes(16);
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(cipherBytes, 0, cipherBytes.Length);
cs.Close();
}
text = Encoding.Unicode.GetString(ms.ToArray());
}
}
return text;
}
/// <summary>
/// Encrypts the specified text.
/// </summary>
/// <param name="text">The text.</param>
/// <returns></returns>
public string Encrypt(string text)
{
return Encrypt(text, Properties.Resources.EncryptionPassword);
}
/// <summary>
/// Encrypts the specified text using the specified pass key.
/// </summary>
/// <param name="text">The text.</param>
/// <param name="key">The key.</param>
/// <returns></returns>
public string Encrypt(string text, string key)
{
if (text.IsNullOrWhiteSpace()) return text;
string EncryptionKey = key;
byte[] clearBytes = Encoding.Unicode.GetBytes(text);
using (Aes encryptor = Aes.Create())
{
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
encryptor.Key = pdb.GetBytes(32);
encryptor.IV = pdb.GetBytes(16);
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(clearBytes, 0, clearBytes.Length);
cs.Close();
}
text = Convert.ToBase64String(ms.ToArray());
}
}
return text;
}
}
}
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