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eliminate one extra multipilication

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orignal 2016-01-08 10:21:43 -05:00
parent 9cc592b564
commit c9d95ff161
1 changed files with 3 additions and 1 deletions
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4
Signature.cpp
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@ -378,7 +378,9 @@ namespace crypto
auto x = RecoverX (y, ctx); auto x = RecoverX (y, ctx);
if (BN_is_bit_set (x, 0) != isHighestBitSet) if (BN_is_bit_set (x, 0) != isHighestBitSet)
BN_sub (x, q, x); // x = q - x BN_sub (x, q, x); // x = q - x
EDDSAPoint p {x, y}; BIGNUM * z = BN_new (), * t = BN_new ();
BN_one (z); BN_mod_mul (t, x, y, q, ctx); // pre-calculate t
EDDSAPoint p {x, y, z, t};
if (!IsOnCurve (p, ctx)) if (!IsOnCurve (p, ctx))
LogPrint (eLogError, "Decoded point is not on 25519"); LogPrint (eLogError, "Decoded point is not on 25519");
return p; return p;