103 lines
2.5 KiB
Go
103 lines
2.5 KiB
Go
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// Copyright 2017-2021 DERO Project. All rights reserved.
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// Use of this source code in any form is governed by RESEARCH license.
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// license can be found in the LICENSE file.
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// GPG: 0F39 E425 8C65 3947 702A 8234 08B2 0360 A03A 9DE8
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//
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package crypto
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import "fmt"
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import "math/big"
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//import "encoding/binary"
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//import "crypto/rand"
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//import "github.com/deroproject/derohe/crypto/bn256"
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// this file implements Big Number Reduced form with bn256's Order
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type BNRed big.Int
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func RandomScalarBNRed() *BNRed {
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return (*BNRed)(RandomScalar())
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}
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// converts big.Int to BNRed
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func GetBNRed(x *big.Int) *BNRed {
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result := new(BNRed)
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((*big.Int)(result)).Set(x)
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return result
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}
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// convert BNRed to BigInt
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func (x *BNRed) BigInt() *big.Int {
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return new(big.Int).Set(((*big.Int)(x)))
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}
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func (x *BNRed) SetBytes(buf []byte) *BNRed {
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((*big.Int)(x)).SetBytes(buf)
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return x
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}
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func (x *BNRed) String() string {
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return ((*big.Int)(x)).Text(16)
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}
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func (x *BNRed) Text(base int) string {
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return ((*big.Int)(x)).Text(base)
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}
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func (x *BNRed) MarshalText() ([]byte, error) {
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return []byte(((*big.Int)(x)).Text(16)), nil
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}
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func (x *BNRed) UnmarshalText(text []byte) error {
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_, err := fmt.Sscan("0x"+string(text), ((*big.Int)(x)))
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return err
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}
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func FillBytes(x *big.Int, xbytes []byte) {
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// FillBytes not available pre 1.15
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bb := x.Bytes()
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if len(bb) > 32 {
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panic(fmt.Sprintf("number not representable in 32 bytes %d %x", len(bb), bb))
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}
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for i := range xbytes { // optimized to memclr
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xbytes[i] = 0
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}
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j := 32
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for i := len(bb) - 1; i >= 0; i-- {
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j--
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xbytes[j] = bb[i]
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}
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}
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/*
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// this will return fixed random scalar
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func RandomScalarFixed() *big.Int {
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//return new(big.Int).Set(fixed)
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return RandomScalar()
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}
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type KeyPair struct {
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x *big.Int // secret key
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y *bn256.G1 // public key
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}
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*/
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