The RC4 algorithm is a symmetric stream cipher and despite having known security vulnerabilities, RC4 is still widely used. 

RC4.NET is a library that adds support for encrypting/decrypting using the symmetric RC4 algorithm in the .NET environment. The library is written in C# language and performs equally well on both the Microsoft CLR and Mono platform.

This extension contains an implementation of this algorithm, with the methods:

• Encrypt
• Decrypt
• StringToHex