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crypto: point_t::is_in_main_subgroup() added

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This commit is contained in:
sowle 2021-06-22 18:00:30 +03:00
parent f738596a3c
commit d591db9a91
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GPG key ID: C07A24B2D89D49FC
1 changed files with 17 additions and 8 deletions
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25
src/crypto/crypto-sugar.h
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@ -433,6 +433,17 @@ namespace crypto
}; // struct scalar_t
//
// Global constants
//
extern const scalar_t c_scalar_1;
extern const scalar_t c_scalar_L;
extern const scalar_t c_scalar_Lm1;
extern const scalar_t c_scalar_P;
extern const scalar_t c_scalar_Pm1;
extern const scalar_t c_scalar_256m1;
extern const scalar_t c_scalar_1div8;
//
//
@ -486,6 +497,7 @@ namespace crypto
zero();
}
// as we're using additive notation, zero means identity group element here and after
void zero()
{
ge_p3_0(&m_p3);
@ -497,6 +509,11 @@ namespace crypto
return fe_isnonzero(m_p3.X) * fe_cmp(m_p3.Y, m_p3.Z) == 0;
}
bool is_in_main_subgroup() const
{
return (c_scalar_L * *this).is_zero();
}
bool from_public_key(const crypto::public_key& pk)
{
return ge_frombytes_vartime(&m_p3, reinterpret_cast<const unsigned char*>(&pk)) == 0;
@ -862,14 +879,6 @@ namespace crypto
//
extern const point_g_t c_point_G;
extern const scalar_t c_scalar_1;
extern const scalar_t c_scalar_L;
extern const scalar_t c_scalar_Lm1;
extern const scalar_t c_scalar_P;
extern const scalar_t c_scalar_Pm1;
extern const scalar_t c_scalar_256m1;
extern const scalar_t c_scalar_1div8;
extern const point_t c_point_H;
extern const point_t c_point_0;