métodos nativos de ruby ​​para comprimir/cifrar cadenas?

Question

Hola, ¿hay alguna función nativa (no instalar otra gema, o no llamar a openssl desde el shell) para comprimir una cadena o encriptar una cadena?

tipo de como mysql compress.

"a very long and loose string".compress
output = "8d20\1l\201"

"8d20\1l\201".decompress
output = "a very long and loose string"?

y del mismo modo para cifrar un trozo de cuerda?

Answer 1

De http://ruby-doc.org/stdlib/libdoc/zlib/rdoc/classes/Zlib.html

# aka compress 
    def deflate(string, level) 
    z = Zlib::Deflate.new(level) 
    dst = z.deflate(string, Zlib::FINISH) 
    z.close 
    dst 
    end 

    # aka decompress 
    def inflate(string) 
    zstream = Zlib::Inflate.new 
    buf = zstream.inflate(string) 
    zstream.finish 
    zstream.close 
    buf 
    end 

de encriptación en http://snippets.dzone.com/posts/show/991

require 'openssl' 
require 'digest/sha1' 
c = OpenSSL::Cipher::Cipher.new("aes-256-cbc") 
c.encrypt 
# your pass is what is used to encrypt/decrypt 
c.key = key = Digest::SHA1.hexdigest("yourpass") 
c.iv = iv = c.random_iv 
e = c.update("crypt this") 
e << c.final 
puts "encrypted: #{e}\n" 
c = OpenSSL::Cipher::Cipher.new("aes-256-cbc") 
c.decrypt 
c.key = key 
c.iv = iv 
d = c.update(e) 
d << c.final 
puts "decrypted: #{d}\n" 

Answer 2

OpenSSL y Zlib. Hay un ejemplo de uso de OpenSSL en this question.