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tls: fix the case of sp_256_mont_tpl_10() leaving striay high bits

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It has no effect on correctness, but interferes with compating internal state
of different implementations.

function                                             old     new   delta
sp_256_proj_point_dbl_10                             443     451      +8
static.sp_256_mont_sub_10                             46      49      +3
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 11/0)               Total: 11 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2021-10-05 19:45:56 +02:00
parent 81d8af1970
commit 55578f2fb7
3 changed files with 72 additions and 11 deletions
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4
networking/tls.h
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@@ -117,3 +117,7 @@ void curve_x25519_compute_pubkey_and_premaster(
void curve_P256_compute_pubkey_and_premaster(
uint8_t *pubkey2x32, uint8_t *premaster32,
const uint8_t *peerkey2x32) FAST_FUNC;
void curve_P256_compute_pubkey_and_premaster_NEW(
uint8_t *pubkey2x32, uint8_t *premaster32,
const uint8_t *peerkey2x32) FAST_FUNC;