From 5d94760cce509f7e98694589d979255139715195 Mon Sep 17 00:00:00 2001
From: orignal <i2porignal@yandex.ru>
Date: Wed, 11 Nov 2015 16:24:56 -0500
Subject: [PATCH] eliminate some transient BIGNUM allocations
---
Signature.cpp | 18 ++++++++----------
1 file changed, 8 insertions(+), 10 deletions(-)
diff --git a/Signature.cpp b/Signature.cpp
index 5951c74f..a415775f 100644
--- a/Signature.cpp
+++ b/Signature.cpp
@@ -202,22 +202,20 @@ namespace crypto
if (!z) { z = BN_new (); BN_one (z); }
if (!t) { t = BN_new (); BN_mul (t, p.x, p.y, ctx); }
- BIGNUM * A = BN_new (), * B = BN_new (), * C = BN_new (), * D = BN_new ();
- BN_sqr (A, p.x, ctx); // A = x^2
- BN_sqr (B, p.y, ctx); // B = y^2
- BN_sqr (C, t, ctx);
- BN_mul (C, C, d, ctx); // C = d*t^2
- BN_sqr (D, z, ctx); // D = z^2
+ BN_sqr (x2, p.x, ctx); // x2 = A = x^2
+ BN_sqr (y2, p.y, ctx); // y2 = B = y^2
+ BN_sqr (t2, t, ctx);
+ BN_mul (t2, t2, d, ctx); // t2 = C = d*t^2
+ BN_sqr (z2, z, ctx); // z2 = D = z^2
BIGNUM * E = BN_new (), * F = BN_new (), * G = BN_new (), * H = BN_new ();
// E = (x+y)*(x+y)-A-B = x^2+y^2+2xy-A-B = 2xy
BN_mul (E, p.x, p.y, ctx);
BN_mul_word (E, 2); // E =2*x*y
- BN_sub (F, D, C); // F = D - C
- BN_add (G, D, C); // G = D + C
- BN_add (H, B, A); // H = B + A
+ BN_sub (F, z2, t2); // F = D - C
+ BN_add (G, z2, t2); // G = D + C
+ BN_add (H, y2, x2); // H = B + A
- BN_free (A); BN_free (B); BN_free (C); BN_free (D);
if (!p.z) BN_free (z);
if (!p.t) BN_free (t);