| Linux in-mum-web1499.main-hosting.eu 5.14.0-503.40.1.el9_5.x86_64 #1 SMP PREEMPT_DYNAMIC Mon May 5 06:06:04 EDT 2025 x86_64 Path : /opt/golang/1.22.0/src/crypto/elliptic/ |
| Current File : //opt/golang/1.22.0/src/crypto/elliptic/nistec_p256.go |
// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build amd64 || arm64
package elliptic
import (
"crypto/internal/nistec"
"math/big"
)
func (c p256Curve) Inverse(k *big.Int) *big.Int {
if k.Sign() < 0 {
// This should never happen.
k = new(big.Int).Neg(k)
}
if k.Cmp(c.params.N) >= 0 {
// This should never happen.
k = new(big.Int).Mod(k, c.params.N)
}
scalar := k.FillBytes(make([]byte, 32))
inverse, err := nistec.P256OrdInverse(scalar)
if err != nil {
panic("crypto/elliptic: nistec rejected normalized scalar")
}
return new(big.Int).SetBytes(inverse)
}