salsa20.el

Salsa20 basic implementation http://cr.yp.to/snuffle/spec.pdf

Salsa20/8 Salsa20/12 http://cr.yp.to/snuffle/812.pdf

Install:

Put this file into load-path'ed directory, and !!!!!!!!!!!!!!! BYTE COMPILE IT !!!!!!!!!!!!!!! And put the following expression into your .emacs.

(require 'salsa20)

Functions:

• salsa20-encrypt

Encrypt/Decrypt BYTES (string) with IV by KEY. BYTES: Encrypt/Decrypt target and is destructively changed. KEY: 16 or 32 byte vector. IV: 8 byte vector. ROUNDS: Optional integer to reduce the number of rounds. See http://cr.yp.to/snuffle/812.pdf refering about Salsa20/8 Salsa20/12 as a secure option.

• salsa20-generator

Return a function which generate random sequence as byte list. This function accept following one of arg indicate the command of this function.

• length of the byte list.
• t means destruct this function.

Optional ROUNDS arg see salsa20-encrypt description.

Sample:

(let ((generator (salsa20-generator (make-vector 16 0) (salsa20-generate-random-iv))))
  (unwind-protect
      (cl-loop repeat 5
               collect (funcall generator 50))
    ;; Should not forget destruct
    (funcall generator t)))