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check a for 0 in Legendre

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orignal 2019-12-10 10:53:39 -05:00
parent 7417867d0f
commit d7b819267f
1 changed files with 2 additions and 1 deletions
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3
libi2pd/Elligator.cpp
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@ -160,7 +160,8 @@ namespace crypto
int Elligator2::Legendre (const BIGNUM * a, BN_CTX * ctx) const int Elligator2::Legendre (const BIGNUM * a, BN_CTX * ctx) const
{ {
// assume a < p, so don't check for a % p = 0 // assume a < p, so don't check for a % p = 0, but a = 0 only
if (BN_is_zero(a)) return 0;
BIGNUM * r = BN_CTX_get (ctx); BIGNUM * r = BN_CTX_get (ctx);
BN_mod_exp (r, a, p12, p, ctx); // r = a^((p-1)/2) mod p BN_mod_exp (r, a, p12, p, ctx); // r = a^((p-1)/2) mod p
if (BN_is_word(r, 1)) if (BN_is_word(r, 1))