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e4_bls315.go
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/
e4_bls315.go
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// Copyright 2020 ConsenSys AG
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package fptower
// MulBybTwistCurveCoeff multiplies by 4*(0,1)
func (z *E4) MulBybTwistCurveCoeff(x *E4) *E4 {
var res E4
res.B1.Set(&x.B0)
res.B0.MulByNonResidue(&x.B1)
z.Double(&res).
Double(z)
return z
}