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add check to sp_invmod_mont_ct to make sure the

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result integer can hold the range of the modulus
This commit is contained in:
John Bland
2023-05-18 20:31:05 -04:00
parent 5f1ce09dce
commit 344c3338a9
1 changed files with 4 additions and 0 deletions
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4
wolfcrypt/src/sp_int.c
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@ -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) ||