Ruby on Rails Decryption mcrypt_decrypt

Question

The following function works perfect in PHP. How can it be translated in Ruby on Rails.

Please note that both privateKey and iv are 32 characters long.

mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $privateKey, base64_decode($enc), MCRYPT_MODE_CBC, $iv)

Thanking you very much in anticipation

possible duplicate of Ruby on Rails Decryption by the same user. — Andrew Marshall
– Andrew Marshall, Commented Apr 17, 2012 at 13:30

Sagar Ranglani · Accepted Answer · 2014-06-02 09:08:23Z

1

Try ruby-mcrypt gem.

require 'rubygems'
require 'mcrypt'

crypto = Mcrypt.new(:twofish, :cbc, MY_KEY, MY_IV, :pkcs)

# encryption and decryption in one step
ciphertext = crypto.encrypt(plaintext)
plaintext  = crypto.decrypt(ciphertext)

answered Jun 2, 2014 at 9:08

Sagar Ranglani

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Comments

Anthony · Accepted Answer · 2012-07-18 04:42:30Z

-1

Use only the specific classes that have those functions.

edited Jul 18, 2012 at 4:42

Anthony

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answered Apr 10, 2012 at 16:12

Igbanam

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5 Comments

user812120 Over a year ago

Many thanks for your quick response. I am new to Ruby on Rails. Could you please throw some more light on it?

user812120 Over a year ago

What gems do I need to install?

user812120 Over a year ago

I have run the following commands at irb command prompt and they return true. require "base64" require 'hmac-md5' require 'crypt/rijndael' When I use the following mcrypt_decrypt(MCRYPT_RIJNDAEL_256, privateKey, Base64.decode64(enc), MCRYPT_MODE_CBC, iv) I get an error uninitialized constant ActionView::CompiledTemplates::MCRYPT_RIJNDAEL_256

user812120 Over a year ago

I will be very grateful if you could please tell me how to get the same results in Ruby on Rails as the following php code produces in php

user812120 Over a year ago

Is there a Ruby equivalent of MCRYPT_RIJNDAEL_256? If I use MCRYPT_RIJNDAEL_256 in PHP and AES-256-CBC in Ruby to encrypt the same data using the same key (32 characters) and iv (32 characters) and then base64 encode the encrypted data, I always get different results. However, if I use MCRYPT_RIJNDAEL_128 in php and AES-256-CBC in Ruby using a key (32 characters) and iv (16 characters) and then base64 encode the encrypted data, I get the same results.

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