Improve polynomial doubling code, move to util

Now does 64-bits at a time instead of 8 bits, and avoids conditional
timing channel on the XOR carry. Confirmed that at least GCC 7 and
Clang 4 on x86-64 compile the functions without conditional jumps.

Also removes CMAC as a dependency of OCB, which only needed it in
order to call CMAC::poly_double

1 files changed, 240 insertions, 0 deletions

diff --git a/src/tests/data/poly_dbl.vec b/src/tests/data/poly_dbl.vec
new file mode 100644
index 000000000..fb5326f07
--- /dev/null
+++ b/src/tests/data/poly_dbl.vec
@@ -0,0 +1,240 @@
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