= salsa20

Ruby-wrapper for the {Salsa20 stream cipher algorithm}[http://cr.yp.to/snuffle.html] designed by Daniel Bernstein. Salsa20 is a family of 256-bit stream ciphers designed in 2005 and submitted to eSTREAM, the ECRYPT Stream Cipher Project.

== How to install

gem install salsa20

You'll need a working compiler -- the crypto code is the {original C implementation}[http://cr.yp.to/snuffle.html] from Daniel Bernstein.

== Usage

require 'salsa20'

key = "VERY_SECRET_256_BIT_KEY_12345678" iv = "-RANDOM-" plain_text = "Salsa20 is a family of 256-bit stream ciphers"

encryptor = Salsa20.new(key, iv) encrypted_text = encryptor.encrypt(plain_text) p encrypted_text

=> "\x9D\x1C\xE4\x83\xAB\x8E\xB7\x85a,\xC3\xF6\x981*\x03\b-\x99\xAD\xDF\xBFS\x96\x94$\xA0\xF0U\v\xABz;=R\xBB\xE1\xB0\xDD\xBC\x1A9\xB8\xBEb"

decryptor = Salsa20.new(key, iv) decrypted_text = decryptor.decrypt(encrypted_text) p decrypted_text

=> "Salsa20 is a family of 256-bit stream ciphers"

The Salsa20 cipher algorhitm supports efficiently seeking to any 64-bytes boundry position in the stream using the +seek+ method. Use +position+ to tell the current stream position in bytes.

For more information, see the detailed rdoc of the Salsa20 class.

== References

• http://cr.yp.to/snuffle.html
• http://www.ecrypt.eu.org/stream/salsa20pf.html
• http://en.wikipedia.org/wiki/Salsa20

== License

MIT open source license (full license text in the +LICENSE+ file).

== Contact

Author :: Dov Murik (dov.murik@gmail.com) Project homepage :: https://github.com/dubek/salsa20-ruby