Simple encryption wrapper for Ruby

encryption.rb

require 'openssl'
require 'digest/sha1'
require 'base64'

class Encryption
    def self.encrypt(src, key, cipher = 'aes-256-cbc')
        c = OpenSSL::Cipher::Cipher.new(cipher)
        c.encrypt
        c.key = Digest::SHA1.hexdigest(key)
        e = c.update(src)
        e << c.final
        Base64.encode64(e)
    end 

    def self.decrypt(src, key, cipher = 'aes-256-cbc')
        c = OpenSSL::Cipher::Cipher.new(cipher)
        c.decrypt
        c.key = Digest::SHA1.hexdigest(key)
        e = Base64.decode64(src)
        d = c.update(e)
        d << c.final
        return d
    end 
end

src = 'Hello world!'
key = 'yourpass'

tmp = Encryption.encrypt(src, key)
puts tmp 

dst = Encryption.decrypt(tmp, key)
puts dst