decrypt PBKDF2/SHA1 and AES

decrypt.rb

require "base64"
require 'openssl'
require 'iconv'

CIPHER = "aes-256-cbc"

#http://www.ruby-doc.org/ruby-1.9/classes/OpenSSL/PKCS5.html

PASSPHRASE = "12345"
IV         = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16].pack("c*")
SALT       = [1, 2, 3, 4, 5, 6, 7, 8].pack("c*")
ITERATIONS = 2048
KEY_LENGTH = 256

module Maitred
  class AesCbcCrypter
    CIPHER = "aes-256-cbc"
    KEY_LENGTH = 256

    def initialize(passphrase, salt, iv, iterations = 1024)
      @key = OpenSSL::PKCS5.pbkdf2_hmac_sha1(passphrase, salt, iterations, KEY_LENGTH)
      @iv = iv
      @cipher_obj = OpenSSL::Cipher::Cipher.new(CIPHER)
    end

    def encrypt(data)
      return nil unless data
      @cipher_obj.encrypt
      Maitred::BcBase64.encode64(encrypt_decrypt_update_final(data)).gsub("\n", '')
    end

    def decrypt(encoded_data)
      return nil unless encoded_data
      @cipher_obj.decrypt
      encrypt_decrypt_update_final(Maitred::BcBase64.decode64(encoded_data))
    end

    private

    def encrypt_decrypt_update_final(data)
      @cipher_obj.key = @key
      @cipher_obj.iv = @iv
      data = @cipher_obj.update(data)
      data << @cipher_obj.final
    end
  end
  
  class BcBase64
    def self.decode64(bc_encoded_string)
      Base64.decode64(bc_encoded_string.gsub("-", "+").gsub("_", "/").gsub(".", "="))
    end
    
    def self.encode64(unencoded_string)
      Base64.encode64(unencoded_string).gsub("+", "-").gsub("/", "_").gsub("=", ".")
    end
  end
end

crypter = Maitred::AesCbcCrypter.new(PASSPHRASE, SALT, IV, ITERATIONS)

encrypted_data = crypter.encrypt("1304013516000:144034499:CORPLOGIN:203")
puts encrypted_data