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don't store B explicitly

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orignal 2015-11-19 22:38:18 -05:00
parent 24d9dacfd9
commit f6eabd695b
1 changed files with 6 additions and 7 deletions
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13
Signature.cpp
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@ -47,6 +47,9 @@ namespace crypto
BN_div_word (tmp, 4);
BN_mod_exp (I, two, tmp, q, ctx);
BN_free (two);
BN_free (tmp);
// 4*inv(5)
BIGNUM * By = BN_new ();
BN_set_word (By, 5);
@ -54,14 +57,10 @@ namespace crypto
BN_mul_word (By, 4);
BIGNUM * Bx = RecoverX (By, ctx);
BN_mod (Bx, Bx, q, ctx); // % q
BN_mod (By, By, q, ctx); // % q
B = {Bx, By};
BN_free (two);
BN_free (tmp);
BN_mod (By, By, q, ctx); // % q
// precalculate Bi16 table
Bi16[0][0] = { BN_dup (Bx), BN_dup (By) };
Bi16[0][0] = { Bx, By }; // B
for (int i = 0; i < 64; i++)
{
if (i) Bi16[i][0] = Sum (Bi16[i-1][14], Bi16[i-1][0], ctx);
@ -384,10 +383,10 @@ namespace crypto
private:
BIGNUM * q, * l, * d, * I;
EDDSAPoint B; // base point
// transient values
BIGNUM * two_252_2; // 2^252-2
EDDSAPoint Bi16[64][15]; // per 4-bits, Bi16[i][j] = (16+j+1)^i*B, we don't store zeroes
// Bi16[0][0] = B, base point
};
static std::unique_ptr<Ed25519> g_Ed25519;