Sep '08
16
Simple Encryption (in Ruby)
I occasionally get questions on how we do authentication in Ruby so I thought I’d write this post so I could direct people here. A lot of the authentication stuff we do is based on this simple implementation of RSA key support. There were a couple minor syntax errors in their crypto-key.rb though so here’s a fixed version:
require 'openssl'
require 'base64' # Added
module Crypto
def self.create_keys(priv = "rsa_key", pub = "#{priv}.pub", bits = 1024)
private_key = OpenSSL::PKey::RSA.new(bits)
File.open(priv, "w+") { |fp| fp << private_key.to_s }
File.open(pub, "w+") { |fp| fp << private_key.public_key.to_s }
private_key
end
class Key
def initialize(data)
@public = (data =~ /^-----BEGIN (RSA|DSA) PRIVATE KEY-----$/).nil?
@key = OpenSSL::PKey::RSA.new(data)
end
def self.from_file(filename)
self.new File.read( filename )
end
def encrypt(text)
Base64.encode64(@key.send("#{key_type}_encrypt", text))
end
def decrypt(text)
@key.send("#{key_type}_decrypt", Base64.decode64(text))
end
def private?() !@public; end # Added () and ;
def public?() @public; end # Added () and ;
def key_type
@public ? :public : :private
end
end
end
