Merge pull request #570 from onelogin/refactor-gcm

Refactor gcm

Author: pitbulk

lib/onelogin/ruby-saml/utils.rb

@@ -296,9 +296,9 @@ def self.retrieve_plaintext(cipher_text, symmetric_key, algorithm)
           when 'http://www.w3.org/2001/04/xmlenc#aes128-cbc' then cipher = OpenSSL::Cipher.new('AES-128-CBC').decrypt
           when 'http://www.w3.org/2001/04/xmlenc#aes192-cbc' then cipher = OpenSSL::Cipher.new('AES-192-CBC').decrypt
           when 'http://www.w3.org/2001/04/xmlenc#aes256-cbc' then cipher = OpenSSL::Cipher.new('AES-256-CBC').decrypt
-          when 'http://www.w3.org/2009/xmlenc11#aes128-gcm' then auth_cipher = OpenSSL::Cipher.new('AES-128-GCM').decrypt
-          when 'http://www.w3.org/2009/xmlenc11#aes192-gcm' then auth_cipher = OpenSSL::Cipher.new('AES-192-GCM').decrypt
-          when 'http://www.w3.org/2009/xmlenc11#aes256-gcm' then auth_cipher = OpenSSL::Cipher.new('AES-256-GCM').decrypt
+          when 'http://www.w3.org/2009/xmlenc11#aes128-gcm' then auth_cipher = OpenSSL::Cipher::AES.new(128, :GCM).decrypt
+          when 'http://www.w3.org/2009/xmlenc11#aes192-gcm' then auth_cipher = OpenSSL::Cipher::AES.new(192, :GCM).decrypt
+          when 'http://www.w3.org/2009/xmlenc11#aes256-gcm' then auth_cipher = OpenSSL::Cipher::AES.new(256, :GCM).decrypt
           when 'http://www.w3.org/2001/04/xmlenc#rsa-1_5' then rsa = symmetric_key
           when 'http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p' then oaep = symmetric_key
         end