[btcsuite/btcd] d9556d: Mitigate timing attacks while using btcec.Decrypt.

[Ishbir Singh]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: d9556df292458844ed1691e50d77cb1122a2990b
      
https://github.com/btcsuite/btcd/commit/d9556df292458844ed1691e50d77cb1122a2990b
  Author: Ishbir Singh <ish...@ishbir.com>
  Date:   2015-05-25 (Mon, 25 May 2015)

  Changed paths:
    M btcec/ciphering.go

  Log Message:
  -----------
  Mitigate timing attacks while using btcec.Decrypt.