A Visual Basic (VB6) implementation of the Salsa20 or ChaCha stream cipher

Salsa20 (and its improved variant ChaCha) are relatively new stream ciphers developed by Professor Daniel J. Bernstein. Both are built on pseudorandom functions that only use three operations: 32-bit addition, bitwise addition (XOR) and rotation. (See Salsa20's Wiki page - [login to view URL]) I need you to write a VB6 project that shows a simple encrypt & decrypt demo (ie. just a couple of textboxes and buttons), using either Salsa20 (or preferably ChaCha, as it's a slightly improved variant), with all of the code in VB6. (ie. no calls to 3rd-party libraries or APIs etc... just pure VB6 code) You'll need to port/translate Bernstein's original C sources for this: Salsa20: [login to view URL] ChaCha: [login to view URL] As you can see it's a fairly small and simple cipher, but I'm not good at reading C! ... [login to view URL] As a part of this project I'll also need you to make and compile a C or C++ version which uses Bernstein's original source code so that I can use it to test and compare that your VB6 version is encrypting and decrypting the same as Bernstein's. The demos (both the VB6 and C or C++ ones) simply need to demonstrate how to accept a line of text (whether its a VB Textbox or simply a commandline parameter), and encrypt and decrypt it. A simple demo of the stream cipher.