76 lines
2.4 KiB
Go
76 lines
2.4 KiB
Go
// Copyright (c) 2013 Conformal Systems LLC.
|
|
// Use of this source code is governed by an ISC
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package btcec
|
|
|
|
import (
|
|
"math/big"
|
|
)
|
|
|
|
const (
|
|
TstPubkeyUncompressed = pubkeyUncompressed
|
|
TstPubkeyCompressed = pubkeyCompressed
|
|
TstPubkeyHybrid = pubkeyHybrid
|
|
)
|
|
|
|
// TstRawInts allows the test package to get the integers from the internal
|
|
// field representation for ensuring correctness. It is only available during
|
|
// the tests.
|
|
func (f *fieldVal) TstRawInts() [10]uint32 {
|
|
return f.n
|
|
}
|
|
|
|
// TstSetRawInts allows the test package to directly set the integers used by
|
|
// the internal field representation. It is only available during the tests.
|
|
func (f *fieldVal) TstSetRawInts(raw [10]uint32) *fieldVal {
|
|
for i := 0; i < len(raw); i++ {
|
|
f.n[i] = raw[i]
|
|
}
|
|
return f
|
|
}
|
|
|
|
// TstPad makes the internal pad function available to the test package.
|
|
func TstPad(size int, b []byte) []byte {
|
|
return pad(size, b)
|
|
}
|
|
|
|
// TstFieldJacobianToBigAffine makes the internal fieldJacobianToBigAffine
|
|
// function available to the test package.
|
|
func (curve *KoblitzCurve) TstFieldJacobianToBigAffine(x, y, z *fieldVal) (*big.Int, *big.Int) {
|
|
return curve.fieldJacobianToBigAffine(x, y, z)
|
|
}
|
|
|
|
// TstIsJacobianOnCurve returns boolean if the point (x,y,z) is on the curve.
|
|
func (curve *KoblitzCurve) TstIsJacobianOnCurve(x, y, z *fieldVal) bool {
|
|
// Elliptic curve equation for secp256k1 is: y^2 = x^3 + 7
|
|
// In Jacobian coordinates, Y = y/z^3 and X = x/z^2
|
|
// Thus:
|
|
// (y/z^3)^2 = (x/z^2)^3 + 7
|
|
// y^2/z^6 = x^3/z^6 + 7
|
|
// y^2 = x^3 + 7*z^6
|
|
var y2, z2, x3, result fieldVal
|
|
y2.SquareVal(y).Normalize()
|
|
z2.SquareVal(z)
|
|
x3.SquareVal(x).Mul(x)
|
|
result.SquareVal(&z2).Mul(&z2).MulInt(7).Add(&x3).Normalize()
|
|
return y2.Equals(&result)
|
|
}
|
|
|
|
// TstAddJacobian makes the internal addJacobian function available to the test
|
|
// package.
|
|
func (curve *KoblitzCurve) TstAddJacobian(x1, y1, z1, x2, y2, z2, x3, y3, z3 *fieldVal) {
|
|
curve.addJacobian(x1, y1, z1, x2, y2, z2, x3, y3, z3)
|
|
}
|
|
|
|
// TstDoubleJacobian makes the internal doubleJacobian function available to the test
|
|
// package.
|
|
func (curve *KoblitzCurve) TstDoubleJacobian(x1, y1, z1, x3, y3, z3 *fieldVal) {
|
|
curve.doubleJacobian(x1, y1, z1, x3, y3, z3)
|
|
}
|
|
|
|
// NewFieldVal returns a new field value set to 0. This is only available to
|
|
// the test package.
|
|
func NewFieldVal() *fieldVal {
|
|
return new(fieldVal)
|
|
}
|