am 0597b069: Merge "ECIES: fix memory leaks and add malloc checks in HKDF. Use fixed-timing memcmp in HmacOperation."

* commit '0597b069de5e8ca2dacffa09537add20f6d28560':
  ECIES: fix memory leaks and add malloc checks in HKDF. Use fixed-timing memcmp in HmacOperation.