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sm9: optimize mul line

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This commit is contained in:
emmansun 2023-05-02 12:13:18 +08:00
parent de6e4c2464
commit 0cf7d640c5
1 changed files with 7 additions and 10 deletions
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17
sm9/bn256/bn_pair.go
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@ -7,7 +7,6 @@ func lineFunctionAdd(r, p *twistPoint, q *curvePoint, r2 *gfP2) (a, b, c *gfP2,
B := (&gfP2{}).Mul(&p.x, &r.t) // B = Xp * Zr^2
D := (&gfP2{}).Mul(&r.z, &r.x)
D = (&gfP2{}).Add(&p.y, &r.z) // D = Yp + Zr
D.Square(D).Sub(D, r2).Sub(D, &r.t).Mul(D, &r.t) // D = ((Yp + Zr)^2 - Zr^2 - Yp^2)*Zr^2 = 2Yp*Zr^3
@ -95,23 +94,21 @@ func lineFunctionDouble(r *twistPoint, q *curvePoint) (a, b, c *gfP2, rOut *twis
}
func mulLine(ret *gfP12, a, b, c *gfP2) {
tx, ty, tz, t, bx, bz := &gfP4{}, &gfP4{}, &gfP4{}, &gfP4{}, &gfP4{}, &gfP4{}
bx.x.SetZero()
bx.y.Set(b)
t1, tz, t, bz := &gfP4{}, &gfP4{}, &gfP4{}, &gfP4{}
bz.x.Set(c)
bz.y.Set(a)
tz.Mul(&ret.z, bz)
t.MulV(&ret.y, bx)
t.MulScalar(&ret.y, b).MulV1(t)
tz.Add(tz, t)
ty.Mul(&ret.y, bz)
t.MulV(&ret.x, bx)
ret.y.Add(ty, t)
t1.Mul(&ret.y, bz)
t.MulScalar(&ret.x, b).MulV1(t)
ret.y.Add(t1, t)
tx.Mul(&ret.z, bx)
t1.MulScalar(&ret.z, b)
t.Mul(&ret.x, bz)
ret.x.Add(tx, t)
ret.x.Add(t1, t)
ret.z.Set(tz)
}