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precalculate g^x mod p table

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orignal 2016-04-08 15:45:23 -04:00
parent 2ebb2d8f0e
commit c45aab7cef
1 changed files with 26 additions and 0 deletions
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26
Crypto.cpp
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@ -153,6 +153,32 @@ namespace crypto
#define elgp GetCryptoConstants ().elgp
#define elgg GetCryptoConstants ().elgg
void PrecalculateElggTable (BIGNUM * table[][256], int len) // table is len's array of array of 256 bignums
{
if (len <= 0) return;
BN_CTX * ctx = BN_CTX_new ();
BN_MONT_CTX * montCtx = BN_MONT_CTX_new ();
BN_MONT_CTX_set (montCtx, elgp, ctx);
BIGNUM * elggMont = BN_new ();
BN_from_montgomery(elggMont, elgg, montCtx, ctx);
for (int i = 0; i < len; i++)
{
table[i][0] = BN_new ();
if (!i)
BN_from_montgomery (table[0][0], BN_value_one (), montCtx, ctx); // 2^0 = 1
else
BN_mod_mul_montgomery (table[i][0], table[i-1][255], elggMont, montCtx, ctx);
for (int j = 1; j < 256; j++)
{
table[i][j] = BN_new ();
BN_mod_mul_montgomery (table[i][j], table[i][j-1], elggMont, montCtx, ctx);
}
}
BN_free (elggMont);
BN_MONT_CTX_free (montCtx);
BN_CTX_free (ctx);
}
// DH
DHKeys::DHKeys (): m_IsUpdated (true)