SIDH_p751/p751toolbox/api.go

package p751toolbox

import (
    . "github.com/cloudflare/p751sidh/internal/utils"
)

type context struct {
    xPA, xQA, xRA ProjectivePoint
    xPB, xQB, xRB ProjectivePoint
    xR ProjectivePoint
    curve ProjectiveCurveParameters
}

func (c *context) LoadBasePoints() {
    // Load points for A
    c.xPA.FromAffine(&P751_affine_PA)
    c.xPA.Z.One()
    c.xQA.FromAffine(&P751_affine_QA)
    c.xQA.Z.One()
    c.xRA.FromAffine(&P751_affine_RA)
    c.xRA.Z.One()

    // Load points for B
    c.xRB.FromAffine(&P751_affine_RB)
    c.xRB.Z.One()
    c.xQB.FromAffine(&P751_affine_QB)
    c.xQB.Z.One()
    c.xPB.FromAffine(&P751_affine_PB)
    c.xPB.Z.One()
}

func (c *context) ScalarMul(scalar []byte, sz uint) {
    c.curve.A.Zero()
    c.curve.C.One()
    // OZAPTF: PA QA RA -> PB QB ... if used for B
    c.xR = RightToLeftLadder(&tmp, &c.xPA, &c.xQA, &c.xRA, sz, scalar)
}

func NewCtx() OperationContext {
    return new(context)
}