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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) }
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