(cherry picked from commit 32213d8d)

(cherry picked from commit b4275915)

(cherry picked from commit 1bc0b68d)

(cherry picked from commit cdb6c484)

Fix PSS signature printing: consistently use 0x prefix for hex values for
padding length and trailer fields.
(cherry picked from commit deb24ad53147f5a8dd63416224a5edd7bbc0e74a)

(cherry picked from commit 96940f4f2d0300c033379a87db0ff19e598c6264)

previous cbc128.c commit].

(cherry picked from commit b69437e1)

(cherry picked from commit 4df2280b)

(and pending AVX2 changes).
(cherry picked from commit 504bbcf3)

(cherry picked from commit 988d11b6)