73 lines
2.6 KiB
Go
73 lines
2.6 KiB
Go
// 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 "crypto/rand"
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//import "encoding/hex"
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import "github.com/deroproject/derohe/cryptography/bn256"
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func NewGeneratorParams(count int) *GeneratorParams {
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GP := &GeneratorParams{}
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var zeroes [64]byte
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GP.G = HashToPoint(HashtoNumber([]byte(PROTOCOL_CONSTANT + "G"))) // this is same as mybase or vice-versa
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GP.H = HashToPoint(HashtoNumber([]byte(PROTOCOL_CONSTANT + "H")))
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var gs, hs []*bn256.G1
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GP.GSUM = new(bn256.G1)
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GP.GSUM.Unmarshal(zeroes[:])
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for i := 0; i < count; i++ {
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gs = append(gs, HashToPoint(HashtoNumber(append([]byte(PROTOCOL_CONSTANT+"G"), hextobytes(makestring64(fmt.Sprintf("%x", i)))...))))
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hs = append(hs, HashToPoint(HashtoNumber(append([]byte(PROTOCOL_CONSTANT+"H"), hextobytes(makestring64(fmt.Sprintf("%x", i)))...))))
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GP.GSUM = new(bn256.G1).Add(GP.GSUM, gs[i])
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}
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GP.Gs = NewPointVector(gs)
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GP.Hs = NewPointVector(hs)
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return GP
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}
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func NewGeneratorParams3(h *bn256.G1, gs, hs *PointVector) *GeneratorParams {
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GP := &GeneratorParams{}
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GP.G = HashToPoint(HashtoNumber([]byte(PROTOCOL_CONSTANT + "G"))) // this is same as mybase or vice-versa
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GP.H = h
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GP.Gs = gs
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GP.Hs = hs
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return GP
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}
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func (gp *GeneratorParams) Commit(blind *big.Int, gexps, hexps *FieldVector) *bn256.G1 {
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result := new(bn256.G1).ScalarMult(gp.H, blind)
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for i := range gexps.vector {
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result = new(bn256.G1).Add(result, new(bn256.G1).ScalarMult(gp.Gs.vector[i], gexps.vector[i]))
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}
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if hexps != nil {
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for i := range hexps.vector {
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result = new(bn256.G1).Add(result, new(bn256.G1).ScalarMult(gp.Hs.vector[i], hexps.vector[i]))
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}
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}
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return result
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}
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