1// Copyright 2022 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package bbig
6
7import (
8	"crypto/internal/boring"
9	"math/big"
10	"unsafe"
11)
12
13func Enc(b *big.Int) boring.BigInt {
14	if b == nil {
15		return nil
16	}
17	x := b.Bits()
18	if len(x) == 0 {
19		return boring.BigInt{}
20	}
21	return unsafe.Slice((*uint)(&x[0]), len(x))
22}
23
24func Dec(b boring.BigInt) *big.Int {
25	if b == nil {
26		return nil
27	}
28	if len(b) == 0 {
29		return new(big.Int)
30	}
31	x := unsafe.Slice((*big.Word)(&b[0]), len(b))
32	return new(big.Int).SetBits(x)
33}
34