Some math deprecations

Mostly things that shouldn't be used (like almost Montgomery inverse,
which isn't even constant time) or are very much just for internals
(like the word-wise Montgomery inverse computation used for reduction).

Make variable time division explicit; leaves plain divide as a call
but it forwards to ct_divide now. All callers within the library are
now explicitly consttime or vartime.

Add a shortcut for modulus by one word - this hits quite often
especially in the ECC code

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/ffi/ffi_mp.cpp b/src/lib/ffi/ffi_mp.cpp
index 513dbbb0c..68869e6ec 100644
--- a/src/lib/ffi/ffi_mp.cpp
+++ b/src/lib/ffi/ffi_mp.cpp
@@ -192,7 +192,7 @@ int botan_mp_div(botan_mp_t quotient,
    {
    return BOTAN_FFI_DO(Botan::BigInt, quotient, q, {
       Botan::BigInt r;
-      Botan::divide(safe_get(x), safe_get(y), q, r);
+      Botan::vartime_divide(safe_get(x), safe_get(y), q, r);
       safe_get(remainder) = r;
       });
    }