blake2b: use proper Go frame sizes
Similar to the previous commit, blake2b's assembly routines claim they
have a zero byte frame and manually subtract a frame from the SP,
which can fail to grow the stack when necessary, leading to memory
corruption.
Fix this by using the correct stack frame sizes so the generated stack
growth prologue is correct, and aligning the SP up instead of down.
Change-Id: Ic426338c45c94a2c01d549860c2295a0ee9200be
Reviewed-on: https://go-review.googlesource.com/31585
Reviewed-by: Adam Langley <agl@golang.org>
Reviewed-by: Andreas Auernhammer <aead@mail.de>
2 files changed
