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AES.cs
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AES.cs
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/*
RMLib: Nonvisual support classes used by multiple R&M Software programs
Copyright (C) Rick Parrish, R&M Software
This file is part of RMLib.
RMLib is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
any later version.
RMLib is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with RMLib. If not, see <http://www.gnu.org/licenses/>.
*/
using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;
using System.Diagnostics.CodeAnalysis;
namespace RandM.RMLib
{
/// <summary>
/// Utility class that handles encryption
/// </summary>
public static class AES
{
/// <summary>
/// Encrypts a string
/// </summary>
/// <param name="plaintext">Text to be encrypted</param>
/// <param name="password">Password to encrypt with</param>
/// <param name="salt">Salt to encrypt with</param>
/// <returns>An encrypted string</returns>
[SuppressMessage("Microsoft.Usage", "CA2202:Do not dispose objects multiple times")]
public static string Encrypt(string plaintext, string password, string salt)
{
string Result = "";
PasswordDeriveBytes DerivedPassword = new PasswordDeriveBytes(Encoding.ASCII.GetBytes(password), Encoding.ASCII.GetBytes(salt), "SHA512", 12345);
using (RijndaelManaged SymmetricKey = new RijndaelManaged())
{
SymmetricKey.Mode = CipherMode.CBC;
using (ICryptoTransform Encryptor = SymmetricKey.CreateEncryptor(DerivedPassword.GetBytes(32), DerivedPassword.GetBytes(16)))
{
using (MemoryStream MemStream = new MemoryStream())
{
using (CryptoStream CryptoStream = new CryptoStream(MemStream, Encryptor, CryptoStreamMode.Write))
{
byte[] PlainTextBytes = Encoding.ASCII.GetBytes(plaintext);
CryptoStream.Write(PlainTextBytes, 0, PlainTextBytes.Length);
CryptoStream.FlushFinalBlock();
Result = Convert.ToBase64String(MemStream.ToArray());
}
}
}
}
return Result;
}
/// <summary>
/// Decrypts a string
/// </summary>
/// <param name="cipherText">Text to be decrypted</param>
/// <param name="password">Password to decrypt with</param>
/// <param name="salt">Salt to decrypt with</param>
/// <returns>A decrypted string</returns>
[SuppressMessage("Microsoft.Usage", "CA2202:Do not dispose objects multiple times")]
public static string Decrypt(string cipherText, string password, string salt)
{
string Result = "";
PasswordDeriveBytes DerivedPassword = new PasswordDeriveBytes(Encoding.ASCII.GetBytes(password), Encoding.ASCII.GetBytes(salt), "SHA512", 12345);
using (RijndaelManaged SymmetricKey = new RijndaelManaged())
{
SymmetricKey.Mode = CipherMode.CBC;
using (ICryptoTransform Decryptor = SymmetricKey.CreateDecryptor(DerivedPassword.GetBytes(32), DerivedPassword.GetBytes(16)))
{
using (MemoryStream MemStream = new MemoryStream(Convert.FromBase64String(cipherText)))
{
using (CryptoStream CryptoStream = new CryptoStream(MemStream, Decryptor, CryptoStreamMode.Read))
{
byte[] PlainTextBytes = new byte[cipherText.Length];
int ByteCount = CryptoStream.Read(PlainTextBytes, 0, PlainTextBytes.Length);
Result = Encoding.ASCII.GetString(PlainTextBytes, 0, ByteCount);
}
}
}
}
return Result;
}
}
}