76 lines
2.4 KiB
Go
76 lines
2.4 KiB
Go
// Copyright (c) 2013-2014 Conformal Systems LLC.
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package btcec
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import (
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"math/big"
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)
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const (
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TstPubkeyUncompressed = pubkeyUncompressed
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TstPubkeyCompressed = pubkeyCompressed
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TstPubkeyHybrid = pubkeyHybrid
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)
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// TstRawInts allows the test package to get the integers from the internal
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// field representation for ensuring correctness. It is only available during
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// the tests.
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func (f *fieldVal) TstRawInts() [10]uint32 {
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return f.n
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}
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// TstSetRawInts allows the test package to directly set the integers used by
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// the internal field representation. It is only available during the tests.
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func (f *fieldVal) TstSetRawInts(raw [10]uint32) *fieldVal {
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for i := 0; i < len(raw); i++ {
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f.n[i] = raw[i]
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}
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return f
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}
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// TstPad makes the internal pad function available to the test package.
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func TstPad(size int, b []byte) []byte {
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return pad(size, b)
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}
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// TstFieldJacobianToBigAffine makes the internal fieldJacobianToBigAffine
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// function available to the test package.
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func (curve *KoblitzCurve) TstFieldJacobianToBigAffine(x, y, z *fieldVal) (*big.Int, *big.Int) {
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return curve.fieldJacobianToBigAffine(x, y, z)
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}
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// TstIsJacobianOnCurve returns boolean if the point (x,y,z) is on the curve.
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func (curve *KoblitzCurve) TstIsJacobianOnCurve(x, y, z *fieldVal) bool {
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// Elliptic curve equation for secp256k1 is: y^2 = x^3 + 7
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// In Jacobian coordinates, Y = y/z^3 and X = x/z^2
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// Thus:
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// (y/z^3)^2 = (x/z^2)^3 + 7
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// y^2/z^6 = x^3/z^6 + 7
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// y^2 = x^3 + 7*z^6
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var y2, z2, x3, result fieldVal
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y2.SquareVal(y).Normalize()
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z2.SquareVal(z)
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x3.SquareVal(x).Mul(x)
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result.SquareVal(&z2).Mul(&z2).MulInt(7).Add(&x3).Normalize()
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return y2.Equals(&result)
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}
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// TstAddJacobian makes the internal addJacobian function available to the test
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// package.
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func (curve *KoblitzCurve) TstAddJacobian(x1, y1, z1, x2, y2, z2, x3, y3, z3 *fieldVal) {
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curve.addJacobian(x1, y1, z1, x2, y2, z2, x3, y3, z3)
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}
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// TstDoubleJacobian makes the internal doubleJacobian function available to the test
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// package.
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func (curve *KoblitzCurve) TstDoubleJacobian(x1, y1, z1, x3, y3, z3 *fieldVal) {
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curve.doubleJacobian(x1, y1, z1, x3, y3, z3)
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}
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// NewFieldVal returns a new field value set to 0. This is only available to
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// the test package.
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func NewFieldVal() *fieldVal {
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return new(fieldVal)
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}
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