github.com/consensys/gnark-crypto@v0.14.0/ecc/bw6-756/fp/bw6_utils.go (about)

     1  // Copyright 2020 ConsenSys AG
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package fp
    16  
    17  // MulByNonResidue multiplies a fp.Element by 33
    18  func (z *Element) MulByNonResidue(x *Element) *Element {
    19  	var t Element
    20  	t.Double(x).
    21  		Double(&t).
    22  		Double(&t).
    23  		Double(&t).
    24  		Double(&t)
    25  	z.Add(&t, x)
    26  	return z
    27  }