mozilla/node-hkdf — pull request #3 by timmclean (2014-11-17 06:27:57+00:00)
Title: Remove unnecessary code

According to RFC2104, HMAC keys are automatically padded to the block
length of the compression function with NUL bytes, see page 3:

"append zeros to the end of K to create a B byte string (e.g., if K is
of length 20 bytes and B=64, then K will be appended with 44 zero bytes
0x00)"