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Fix for ecc and no cache resistance - set M[2]

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Need to have a value in order to maintain timing resistance.
Small maths fails also.
This commit is contained in:
Sean Parkinson
2020-01-16 09:35:34 +10:00
parent 6b4551c012
commit 584d8498f8
1 changed files with 4 additions and 0 deletions
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4
wolfcrypt/src/ecc.c
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@ -2769,6 +2769,10 @@ int wc_ecc_mulmod_ex(mp_int* k, ecc_point *G, ecc_point *R,
/* M[1] == 2G */
if (err == MP_OKAY)
err = ecc_projective_dbl_point(tG, M[1], a, modulus, mp);
#ifdef WC_NO_CACHE_RESISTANT
if (err == MP_OKAY)
err = wc_ecc_copy_point(M[0], M[2]);
#endif
/* setup sliding window */
mode = 0;