Encrypting and decrypting sample with ruby and openssl

Question

i'm trying to do a sample app, for testing purposes vs other people development, and would like to print to the screen the encrypted string, and put it back to a decrypt mechanism....I just don't seem to be finding the way to do this...I've tried base64 and unpack, and feel this is the way, but am not getting there.

require 'openssl'
require 'base64'

def ask(prompt)
    loop do
        print prompt, ' '
        $stdout.flush
        s = gets
        return s.chomp
    end    
end

def aes(m,k,t)
(aes = OpenSSL::Cipher::Cipher.new('aes-256-cbc').send(m)).key = Digest::SHA256.digest(k)
aes.update(t) << aes.final
end

def encrypt(key, text)
aes(:encrypt, key, text)
end

def decrypt(key, text)
aes(:decrypt, key, text)
end


def my_decrypt
 @crypted = ask("Crypted data: ") 
 decrypted = decrypt("12345678911131511192123252729412",@crypted) 
 print decrypted
end

def my_encrypt
 @decrypted = ask("Data to encrypt: ") 
 crypted = encrypt("12345678911131511192123252729412",@decrypted) 
 print crypted
end


option=ask("Option 1 - Encrypt, 2 decrypt")
case option
    when "1" then my_encrypt
    when "2" then my_decrypt
    else print "Option not valid"
end

Anyone to the rescue?

Thank you

Answer 1

After some fight, i finally got it...I just need to convert the binary to Hex, and then back to binary...

Two notes : to convert a binary to hex, you can use String.unpack, which will return an array. To convert an hex to binary, you first need to build it as an array ["anystringhere"] , and then pack it back to binary using Array.pack

Here is the resulting code

require 'openssl'
require 'base64'

def ask(prompt)
  loop do
    print prompt, ' '
    $stdout.flush
    s = gets
    return s.chomp
  end
end

def aes(m,k,t)
  (aes = OpenSSL::Cipher::Cipher.new('aes-256-cbc').send(m)).key = Digest::SHA256.digest(k)
  aes.update(t) << aes.final
end

def encrypt(key, text)
  aes(:encrypt, key, text)
end

def decrypt(key, text)
  aes(:decrypt, key, text)
end


def my_decrypt
  @crypted = ask("Crypted data: ")
  decrypted = decrypt("12345678911131517192123252729313",[@crypted].pack('H*'))
  print decrypted
end

def my_encrypt
  @decrypted = ask("Data to encrypt: ")
  crypted = encrypt("12345678911131517192123252729313",@decrypted)
  print u=crypted.unpack('H*')
end


option=ask("Option 1 - Encrypt, 2 decrypt")
case option
when "1" then my_encrypt
when "2" then my_decrypt
else print "Option not valid"
end