[C#] "Tool" class.

Originally this class was intended for just encryptions / decryptions but I happened to expand it bit by bit of what I needed for OS and Encryptions. Figured it could help a few people out.

Credits to Chris because he originally started this. I just picked it up and added a lot of stuff.

Character Offset Encryption & Decryption ( if you want to encrypt "A" by two characters it'll return "C" -> Lots room to expand on for special characters and etc)
MD5 Encryption
Base64 Encryption and Decryption
Flip String (ABC becomes CBA)
isNumeric (Is this value really numeric or nah?)
A bunch of Hex stuff (str2Hex, Hex2Str, etc etc)
Sha1 Encryption
A ton of Windows OS information from registry (username, user profile, homedrive, etc etc)
Timestamp (Could upgrade / update add more functionality)

PHP Code:

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Globalization;
using System.Security.Cryptography;
using Microsoft.Win32;

static class Tools
{
    #region Object To Hex
    public static String Int2Hex(Int32 Input)
    {
        return Input.ToString("x").PadLeft(4, '0');
    }

    public static String Long2Hex(Int64 Input)
    {
        return Input.ToString("x").PadLeft(8, '0');
    }

    public static String String2Hex(String Input)
    {
        String Output = "";
        for (Int32 i = 0; i < Input.Length; i++)
        {
            Output += String.Format("{0:x2}", System.Convert.ToUInt32(Input[i]));
        }
        return Output.PadLeft(Input.Length * 2, '0');
    }
    #endregion

    #region Hex To Object
    public static Int32 Hex2Int(String Input)
    {
        return Int32.Parse(Input, NumberStyles.HexNumber);
    }

    public static Int64 Hex2Long(String Input)
    {
        return Int64.Parse(Input, NumberStyles.HexNumber);
    }

    public static String Hex2String(String Input)
    {
        if (Input.Length % 2 == 0)
        {
            Input = Input.TrimStart('0');
            byte[] Bytes = new byte[Input.Length / 2];
            for (int i = 0; i < Bytes.Length; i++)
            {
                Bytes[i] = Convert.ToByte(Input.Substring(i * 2, 2), 16);
            }
            return Encoding.ASCII.GetString(Bytes);
        }
        return "";
    }
    #endregion

    #region Offset Encryption
    static public string Offset_Encryption(string Input, int Distance)
    {
        string Output = "";
        for (int i = 0; i < Input.Length; i++)
        {
            int Letter = ((int)Input[i]);
            if ((Letter + Distance) > 122)
            {
                Letter = ((Letter + Distance) - 123) + 97;
            }
            else
            {
                Letter += Distance;
            }
            Output += (char)Letter;
        }
        return Output;
    }

    static public string Offset_Decryption(string Input, int Distance)
    {
        string Output = "";
        for (int i = 0; i < Input.Length; i++)
        {
            int Letter = ((int)Input[i]);
            if ((Letter - Distance) < 97)
            {
                Letter = 122 - (96 - (Letter - Distance));
            }
            else
            {
                Letter -= Distance;
            }
            Output += (char)Letter;
        }
        return Output;
    }
    #endregion

    #region Base64
    public static String BaseEn(string data)
    {
        try
        {
            byte[] encData_byte = new byte[data.Length];
            encData_byte = System.Text.Encoding.UTF8.GetBytes(data);
            string encodedData = Convert.ToBase64String(encData_byte);
            return encodedData;
        }
        catch (Exception e)
        {
            throw new Exception("Error in base64Encode" + e.Message);
        }
    }

    public static String BaseDe(string data)
    {
        try
        {
            System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();
            System.Text.Decoder utf8Decode = encoder.GetDecoder();

            byte[] todecode_byte = Convert.FromBase64String(data);
            int charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);
            char[] decoded_char = new char[charCount];
            utf8Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);
            string result = new String(decoded_char);
            return result;
        }
        catch (Exception e)
        {
            throw new Exception("Error in base64Decode" + e.Message);
        }
    }
    #endregion

    #region MD5
    public static String md5(String Data_To_Encrypt)
    {
        return System.Text.RegularExpressions.Regex.Replace(BitConverter.ToString((new MD5CryptoServiceProvider()).ComputeHash(ASCIIEncoding.Default.GetBytes(Data_To_Encrypt))), "-", "").ToLower();
    }
    #endregion

    #region Sha1
    public static string sha1(string inputString)
    {
        HashAlgorithm algorithm = SHA1.Create();  // SHA1.Create()

        StringBuilder sb = new StringBuilder();
        foreach (byte b in algorithm.ComputeHash(Encoding.UTF8.GetBytes(inputString)))
            sb.Append(b.ToString("X2"));

        return sb.ToString().ToLower();
    }

    #endregion

    #region Flip
    public static string Flip(string Text)
    {
        char[] character = Text.ToCharArray();
        Array.Reverse(character);
        return new string(character);
    }
    #endregion

    #region TimeStamp
    public static String GetTimestamp(DateTime value)
    {
        return value.ToString("HHmmssffff");
    }
    #endregion

    #region Random String
    public static string Random_String(int Length)
    {
        Random random = new Random();
        string characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890()*&^!@#$%_-=+{}[]|/?><.,~`'\"";
        string rand = string.Empty;

        for (int i = 0; i < Length; i++)
        {
            rand += characters[random.Next(0, characters.Count())];
        }

        return rand;
    }
    #endregion

    #region Computer Information
    private static RegistryKey registryKey = Registry.CurrentUser.OpenSubKey("Volatile Environment");
    public static String AppData()
    {
        return registryKey.GetValue("APPDATA").ToString();
    }

    public static String HomeDrive()
    {
        return registryKey.GetValue("HOMEDRIVE").ToString();
    }

    public static String HomePath()
    {
        return registryKey.GetValue("HOMEPATH").ToString();
    }

    public static String LocalAppData()
    {
        return registryKey.GetValue("LOCALAPPDATA").ToString();
    }

    public static String Username()
    {
        return registryKey.GetValue("USERNAME").ToString();
    }

    public static String UserProfile()
    {
        return registryKey.GetValue("USERPROFILE").ToString();
    }
    #endregion

    #region Other
    public static Boolean isNumeric(String Value)
    {
        double num;
        return double.TryParse(Value, out num);
    }
    #endregion


} 


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