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| author | wycats <wycats@gmail.com> | 2010-06-04 09:48:57 -0700 |
|---|---|---|
| committer | wycats <wycats@gmail.com> | 2010-06-04 20:11:05 -0700 |
| commit | 8b05c5207dd5757d55d0c384740db289e6bd5415 (patch) | |
| tree | 97a19e5db0c81b3d038dd53db37f2499cc80a69b /activesupport/lib/active_support/message_verifier.rb | |
| parent | 5fa3a2d12395ce1d7188c3b7dcb5d616e77eb5dd (diff) | |
| download | rails-8b05c5207dd5757d55d0c384740db289e6bd5415.tar.gz rails-8b05c5207dd5757d55d0c384740db289e6bd5415.tar.bz2 rails-8b05c5207dd5757d55d0c384740db289e6bd5415.zip | |
Improve performance of MessageVerifier while keeping it constant time
Diffstat (limited to 'activesupport/lib/active_support/message_verifier.rb')
| -rw-r--r-- | activesupport/lib/active_support/message_verifier.rb | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/activesupport/lib/active_support/message_verifier.rb b/activesupport/lib/active_support/message_verifier.rb index 6c46b68eaf..1031662293 100644 --- a/activesupport/lib/active_support/message_verifier.rb +++ b/activesupport/lib/active_support/message_verifier.rb @@ -47,11 +47,11 @@ module ActiveSupport def secure_compare(a, b) return false unless a.bytesize == b.bytesize - l = a.unpack "C#{a.bytesize}" + l = a.unpack "C*" - res = 0 - b.each_byte { |byte| res |= byte ^ l.shift } - res == 0 + res = true + b.each_byte { |byte| res = (byte == l.shift) && res } + res end def generate_digest(data) |