medium_one_ruby_cipher.rb

require 'openssl'
require 'digest/sha1'

require 'base64'

@key = Digest::SHA1.hexdigest('74cf0e9a3c2b904e9c445771cdccb3e6ce3e4da7')
@cipher = OpenSSL::Cipher::Cipher.new('aes-256-cbc')

def encrypt(data)
    @cipher.encrypt
    @cipher.key = @key
    rc = @cipher.update(data)
    rc << @cipher.final

    return rc
end

def decrypt(data)
    @cipher.decrypt
    @cipher.key = @key

    rc = @cipher.update(Base64::decode64(data))
    rc << @cipher.final

    return rc
end

token_txt = "serveradmin:bob:1234567"
token   = encrypt(token_txt)
token64 = Base64::encode64(token).strip.delete("\n")

puts "Encrypted text (base64): #{token64}"