Break dependency on uint64_t. It's possible to declare bits as
unsigned int, because TLS packets are limited in size and 32-bit
value can't overflow.
(cherry picked from commit cab13fc8473856a43556d41d8dac5605f4ba1f91)

(cherry picked from commit 34ab3c8c711ff79c2b768f0b17e4b2a78fd1df5d)

We have to use EVP in FIPS mode so we can only partially mitigate
timing differences.

Make an extra call to EVP_DigestSignUpdate to hash additonal blocks
to cover any timing differences caused by removal of padding.
(cherry picked from commit b908e88ec15aa0a74805e3f2236fc4f83f2789c2)

(cherry picked from commit 014265eb02e26f35c8db58e2ccbf100b0b2f0072)