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crypto/secp256k1: improve doubleJacobian

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ericxtheodore 2025-08-18 12:02:46 +08:00 committed by GitHub
parent a9a19c4202
commit e6f050b103
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GPG key ID: B5690EEEBB952194
1 changed files with 7 additions and 7 deletions
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8
crypto/secp256k1/curve.go
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@ -205,22 +205,22 @@ func (bitCurve *BitCurve) doubleJacobian(x, y, z *big.Int) (*big.Int, *big.Int,
d.Mul(d, d) //(X1+B)²
d.Sub(d, a) //(X1+B)²-A
d.Sub(d, c) //(X1+B)²-A-C
d.Mul(d, big.NewInt(2)) //2*((X1+B)²-A-C)
d.Lsh(d, 1) //2*((X1+B)²-A-C)
e := new(big.Int).Mul(big.NewInt(3), a) //3*A
f := new(big.Int).Mul(e, e) //E²
x3 := new(big.Int).Mul(big.NewInt(2), d) //2*D
x3 := new(big.Int).Lsh(d, 1) //2*D
x3.Sub(f, x3) //F-2*D
x3.Mod(x3, bitCurve.P)
y3 := new(big.Int).Sub(d, x3) //D-X3
y3.Mul(e, y3) //E*(D-X3)
y3.Sub(y3, new(big.Int).Mul(big.NewInt(8), c)) //E*(D-X3)-8*C
y3.Sub(y3, new(big.Int).Lsh(c, 3)) //E*(D-X3)-8*C
y3.Mod(y3, bitCurve.P)
z3 := new(big.Int).Mul(y, z) //Y1*Z1
z3.Mul(big.NewInt(2), z3) //3*Y1*Z1
z3.Lsh(z3, 1) //2*Y1*Z1
z3.Mod(z3, bitCurve.P)
return x3, y3, z3