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- Inputs with length % 64 >= 56 potentially generate the wrong hash.
- In MD4Sum function the last 4 bytes of the final array were never
  initialized.
- This would result in NTLM failing due to incorrect hash when the
  password length % 32 >= 28 (unicode password).
- Fixes fuzzer bug that was caught by new NTLM fuzzer.
- Added test suite from RFC 1320 for MD4.
- Md4Test.RfcTest6_Mod56CornerCase fails without this fix.

BUG=chromium:752491

Change-Id: If7b718b8c80f00819200332a027bb2f430b8f68e
Reviewed-on: https://chromium-review.googlesource.com/602693
Commit-Queue: Zentaro Kavanagh <zentaro@google.com>
Reviewed-by: Asanka Herath <asanka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#492432}