From 4b11dea3917f2101d7125a967877abf19c36317a Mon Sep 17 00:00:00 2001 From: Guillermo Iguaran Date: Thu, 23 Oct 2014 10:58:43 -0300 Subject: Use AS secure_compare in AS::MessageVerifier --- activesupport/lib/active_support/message_verifier.rb | 14 ++------------ 1 file changed, 2 insertions(+), 12 deletions(-) (limited to 'activesupport/lib/active_support/message_verifier.rb') diff --git a/activesupport/lib/active_support/message_verifier.rb b/activesupport/lib/active_support/message_verifier.rb index 6cb2884fb7..4e0796f4f8 100644 --- a/activesupport/lib/active_support/message_verifier.rb +++ b/activesupport/lib/active_support/message_verifier.rb @@ -1,5 +1,6 @@ require 'base64' require 'active_support/core_ext/object/blank' +require 'active_support/security_utils' module ActiveSupport # +MessageVerifier+ makes it easy to generate and verify messages which are @@ -37,7 +38,7 @@ module ActiveSupport raise InvalidSignature if signed_message.blank? data, digest = signed_message.split("--") - if data.present? && digest.present? && secure_compare(digest, generate_digest(data)) + if data.present? && digest.present? && ActiveSupport::SecurityUtils.secure_compare(digest, generate_digest(data)) begin @serializer.load(::Base64.strict_decode64(data)) rescue ArgumentError => argument_error @@ -55,17 +56,6 @@ module ActiveSupport end private - # constant-time comparison algorithm to prevent timing attacks - def secure_compare(a, b) - return false unless a.bytesize == b.bytesize - - l = a.unpack "C#{a.bytesize}" - - res = 0 - b.each_byte { |byte| res |= byte ^ l.shift } - res == 0 - end - def generate_digest(data) require 'openssl' unless defined?(OpenSSL) OpenSSL::HMAC.hexdigest(OpenSSL::Digest.const_get(@digest).new, @secret, data) -- cgit v1.2.3