AES Encryption\Decryption

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Description	This script encrypts and decrypts text using the AES256 algorithm. For security, it doesn't use the clipboard at all.
Language	C# (.Net)
Minimum Version	5.6+
Created By	jackz98
Contributors	-
Date Created	Oct 8, 2019
Date Last Modified	Feb 18, 2020

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using System; using System.IO; using System.IO.Compression; using System.Security.Cryptography; using System.Text; /// <summary> /// C# AES256 by jackz98 /// </summary> public static class ClipboardFusionHelper { private static readonly int Iterations = 10025; private static byte[] CompressBytes(byte[] bytes) { using (MemoryStream compressStream = new MemoryStream()) { using (var zipStream = new GZipStream(compressStream, CompressionMode.Compress)) zipStream.Write(bytes, 0, bytes.Length); return compressStream.ToArray(); } } private static byte[] DecompressBytes(byte[] bytes) { using (var compressStream = new MemoryStream(bytes)) { using (var zipStream = new GZipStream(compressStream, CompressionMode.Decompress)) { using (var resultStream = new MemoryStream()) { zipStream.CopyTo(resultStream); return resultStream.ToArray(); } } } } public static byte[] D(byte[] input, string password, bool enc) { using (var aes = new AesManaged() { KeySize = 256, BlockSize = 128, Mode = CipherMode.CBC, Padding = PaddingMode.PKCS7 }) { byte[] salt = new byte[16]; if(enc) new RNGCryptoServiceProvider().GetBytes(salt); else Array.Copy(input, 0, salt, 0, salt.Length); using (var generator = new Rfc2898DeriveBytes(password, salt, Iterations)) { aes.IV = generator.GetBytes(16); aes.Key = generator.GetBytes(32); ICryptoTransform eng; if (enc) eng = aes.CreateEncryptor(); else eng = aes.CreateDecryptor(); using (var outStream = new MemoryStream()) { if(enc) outStream.Write(salt, 0, salt.Length); using (var cryptoStream = new CryptoStream(outStream, eng, CryptoStreamMode.Write)) using (var binaryWriter = new BinaryWriter(cryptoStream)) { if(enc) binaryWriter.Write(CompressBytes(input)); else binaryWriter.Write(input, salt.Length, input.Length - salt.Length); } if(enc) return outStream.ToArray(); else return DecompressBytes(outStream.ToArray()); } } } } private static string AddNewLine(string s) { var sb = new StringBuilder(s); for (int i = (s.Length / 64) * 64; i >= 64; i -= 64) sb.Insert(i, Environment.NewLine); return sb.ToString(); } public static string ProcessText(string text) { // your code goes here text = BFS.Clipboard.CopyText(); BFS.ClipboardFusion.PauseClipboardListener(); if (text != null && text.Length >= 0) { string res; string a = BFS.Dialog.GetUserInputListViewWithFilter("AES Encryption/Decryption", new string[2] { "Encryption", "Decryption" }); if (a == "Encryption") { string pass = BFS.Dialog.GetUserInput("Encryption: Input your password here!", ""); if (pass != "") { res = AddNewLine(System.Convert.ToBase64String(D(System.Text.Encoding.UTF8.GetBytes(text), pass, true))); BFS.Clipboard.PasteText(res); } } else if (a != "") { string pass = BFS.Dialog.GetUserInput("Decryption: Input your password here!", ""); if (pass != "") { try { res = Encoding.UTF8.GetString(D(System.Convert.FromBase64String(text), pass, false)); BFS.Clipboard.PasteText(res); } catch (Exception) { BFS.Dialog.ShowMessageError("Decryption Failed: malformated text, corrupted message or wrong password!"); } } } } BFS.Clipboard.Clear(); BFS.ClipboardFusion.ResumeClipboardListener(); return null; } }