73 lines
2.6 KiB
Go
73 lines
2.6 KiB
Go
// Copyright 2017-2021 DERO Project. All rights reserved.
|
|
// Use of this source code in any form is governed by RESEARCH license.
|
|
// license can be found in the LICENSE file.
|
|
// GPG: 0F39 E425 8C65 3947 702A 8234 08B2 0360 A03A 9DE8
|
|
//
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
|
|
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
|
|
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
|
|
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
package crypto
|
|
|
|
import "fmt"
|
|
import "math/big"
|
|
|
|
//import "crypto/rand"
|
|
//import "encoding/hex"
|
|
|
|
import "github.com/deroproject/derohe/crypto/bn256"
|
|
|
|
func NewGeneratorParams(count int) *GeneratorParams {
|
|
GP := &GeneratorParams{}
|
|
var zeroes [64]byte
|
|
|
|
GP.G = HashToPoint(HashtoNumber([]byte(PROTOCOL_CONSTANT + "G"))) // this is same as mybase or vice-versa
|
|
GP.H = HashToPoint(HashtoNumber([]byte(PROTOCOL_CONSTANT + "H")))
|
|
|
|
var gs, hs []*bn256.G1
|
|
|
|
GP.GSUM = new(bn256.G1)
|
|
GP.GSUM.Unmarshal(zeroes[:])
|
|
|
|
for i := 0; i < count; i++ {
|
|
gs = append(gs, HashToPoint(HashtoNumber(append([]byte(PROTOCOL_CONSTANT+"G"), hextobytes(makestring64(fmt.Sprintf("%x", i)))...))))
|
|
hs = append(hs, HashToPoint(HashtoNumber(append([]byte(PROTOCOL_CONSTANT+"H"), hextobytes(makestring64(fmt.Sprintf("%x", i)))...))))
|
|
|
|
GP.GSUM = new(bn256.G1).Add(GP.GSUM, gs[i])
|
|
}
|
|
GP.Gs = NewPointVector(gs)
|
|
GP.Hs = NewPointVector(hs)
|
|
|
|
return GP
|
|
}
|
|
|
|
func NewGeneratorParams3(h *bn256.G1, gs, hs *PointVector) *GeneratorParams {
|
|
GP := &GeneratorParams{}
|
|
|
|
GP.G = HashToPoint(HashtoNumber([]byte(PROTOCOL_CONSTANT + "G"))) // this is same as mybase or vice-versa
|
|
GP.H = h
|
|
GP.Gs = gs
|
|
GP.Hs = hs
|
|
return GP
|
|
}
|
|
|
|
func (gp *GeneratorParams) Commit(blind *big.Int, gexps, hexps *FieldVector) *bn256.G1 {
|
|
result := new(bn256.G1).ScalarMult(gp.H, blind)
|
|
for i := range gexps.vector {
|
|
result = new(bn256.G1).Add(result, new(bn256.G1).ScalarMult(gp.Gs.vector[i], gexps.vector[i]))
|
|
}
|
|
if hexps != nil {
|
|
for i := range hexps.vector {
|
|
result = new(bn256.G1).Add(result, new(bn256.G1).ScalarMult(gp.Hs.vector[i], hexps.vector[i]))
|
|
}
|
|
}
|
|
return result
|
|
}
|