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add check to sp_invmod_mont_ct to make sure the #6426

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Merged
SparkiDev merged 1 commit into from
May 21, 2023
Merged

add check to sp_invmod_mont_ct to make sure the #6426

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4 changes: 4 additions & 0 deletions wolfcrypt/src/sp_int.c
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Original file line number Diff line number Diff line change
Expand Up @@ -12445,6 +12445,10 @@ int sp_invmod_mont_ct(const sp_int* a, const sp_int* m, sp_int* r,
else if (m->used * 2 >= SP_INT_DIGITS) {
err = MP_VAL;
}
/* check that r can hold the range of the modulus result */
else if (m->used > r->size) {
err = MP_VAL;
}

/* 0 != n*m + 1 (+ve m), r*a mod 0 is always 0 (never 1) */
if ((err == MP_OKAY) && (sp_iszero(a) || sp_iszero(m) ||
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