arnaucube
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go-blindsecp256k1
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Implement https://sci-hub.do/10.1109/ICCKE.2013.6682844 

Previous to this commit there was the implementation of "[An Efficient Blind Signature Scheme Based on the Elliptic Curve Discrete Logarithm Problem](http://www.isecure-journal.com/article_39171_47f9ec605dd3918c2793565ec21fcd7a.pdf)" paper by by Morteza Nikooghadama & Ali Zakerolhosseini.

This commit adds the implementation of "[New Blind Signature Schemes Based on the (Elliptic Curve) Discrete Logarithm Problem](https://sci-hub.do/10.1109/ICCKE.2013.6682844)" paper by Hamid Mala & Nafiseh Nezhadansari.
pull/1/head
arnaucube 3 years ago
parent
c3e4afc552
commit
ec095bba83
10 changed files with 576 additions and 45 deletions
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  1. +1
    -1
      README.md
  2. +36
    -36
      blindsecp256k1.go
  3. +1
    -0
      go.mod
  4. +194
    -0
      go.sum
  5. +5
    -0
      v0/README.md
  6. +214
    -0
      v0/blindsecp256k1v0.go
  7. +30
    -0
      v0/blindsecp256k1v0_test.go
  8. +83
    -7
      wasm/blindsecp256k1-wasm.go
  9. BIN
      wasm/webtest/blindsecp256k1.wasm
  10. +12
    -1
      wasm/webtest/index.js

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README.md
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@ -1,6 +1,6 @@
# go-blindsecp256k1 [![GoDoc](https://godoc.org/github.com/arnaucube/go-blindsecp256k1?status.svg)](https://godoc.org/github.com/arnaucube/go-blindsecp256k1) [![Go Report Card](https://goreportcard.com/badge/github.com/arnaucube/go-blindsecp256k1)](https://goreportcard.com/report/github.com/arnaucube/go-blindsecp256k1) [![Test](https://github.com/arnaucube/go-blindsecp256k1/workflows/Test/badge.svg)](https://github.com/arnaucube/go-blindsecp256k1/actions?query=workflow%3ATest)
Blind signature over [secp256k1](https://en.bitcoin.it/wiki/Secp256k1), based on *"[An Efficient Blind Signature Scheme Based on the Elliptic Curve Discrete Logarithm Problem](http://www.isecure-journal.com/article_39171_47f9ec605dd3918c2793565ec21fcd7a.pdf)"* paper.
Blind signature over [secp256k1](https://en.bitcoin.it/wiki/Secp256k1), based on *"[New Blind Signature Schemes Based on the (Elliptic Curve) Discrete Logarithm Problem](https://sci-hub.do/10.1109/ICCKE.2013.6682844)"* paper by Hamid Mala & Nafiseh Nezhadansari.
**WARNING**: this repo is experimental, do not use in production.

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blindsecp256k1.go
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@ -1,5 +1,7 @@
// Package blindsecp256k1 implements the Blind signature scheme explained at
// http://www.isecure-journal.com/article_39171_47f9ec605dd3918c2793565ec21fcd7a.pdf
// "New Blind Signature Schemes Based on the (Elliptic Curve) Discrete
// Logarithm Problem", by Hamid Mala & Nafiseh Nezhadansari
// https://sci-hub.do/10.1109/ICCKE.2013.6682844
//
// LICENSE can be found at https://github.com/arnaucube/go-blindsecp256k1/blob/master/LICENSE
//
@ -13,6 +15,7 @@ import (
"math/big"
"github.com/btcsuite/btcd/btcec"
"github.com/ethereum/go-ethereum/crypto"
)
var (
@ -127,7 +130,7 @@ func (signer *SignerPrivateData) PublicData() *SignerPublicData {
// SignerPrivateData values
func (signer *SignerPrivateData) BlindSign(mBlinded *big.Int) *big.Int {
// TODO add pending checks
// s' = d(m') + k
// s' = dm' + k
sBlind := new(big.Int).Add(
new(big.Int).Mul(signer.D.BigInt(), mBlinded),
signer.K)
@ -139,9 +142,8 @@ func (signer *SignerPrivateData) BlindSign(mBlinded *big.Int) *big.Int {
type UserSecretData struct {
A *big.Int
B *big.Int
C *big.Int
F *Point // public
F *Point // public (in the paper is R)
}
// Blind performs the blinding operation on m using SignerPublicData parameters
@ -149,25 +151,21 @@ func Blind(m *big.Int, signer *SignerPublicData) (*big.Int, *UserSecretData) {
u := &UserSecretData{}
u.A = newRand()
u.B = newRand()
u.C = newRand()
binv := new(big.Int).ModInverse(u.B, N)
// F = b^-1 R + a b^-1 Q + c G
bR := signer.R.Mul(binv)
abinv := new(big.Int).Mul(u.A, binv)
abinv = new(big.Int).Mod(abinv, N)
abQ := signer.Q.Point().Mul(abinv)
cG := G.Mul(u.C)
u.F = bR.Add(abQ).Add(cG)
// TODO check F==O
r := new(big.Int).Mod(u.F.X, N)
// m' = br(m)+a
br := new(big.Int).Mul(u.B, r)
brm := new(big.Int).Mul(br, m)
mBlinded := new(big.Int).Add(brm, u.A)
mBlinded = new(big.Int).Mod(mBlinded, N)
// (R) F = aR' + bG
aR := signer.R.Mul(u.A)
bG := G.Mul(u.B)
u.F = aR.Add(bG)
rx := new(big.Int).Mod(u.F.X, N)
// m' = a^-1 rx h(m)
ainv := new(big.Int).ModInverse(u.A, N)
ainvrx := new(big.Int).Mul(ainv, rx)
hBytes := crypto.Keccak256(m.Bytes())
h := new(big.Int).SetBytes(hBytes)
mBlinded := new(big.Int).Mul(ainvrx, h)
return mBlinded, u
}
@ -180,11 +178,9 @@ type Signature struct {
// Unblind performs the unblinding operation of the blinded signature for the
// given message m and the UserSecretData
func Unblind(sBlind, m *big.Int, u *UserSecretData) *Signature {
// s = b^-1 s' + c
binv := new(big.Int).ModInverse(u.B, N)
bs := new(big.Int).Mul(binv, sBlind)
s := new(big.Int).Add(bs, u.C)
s = new(big.Int).Mod(s, N)
// s = a s' + b
as := new(big.Int).Mul(u.A, sBlind)
s := new(big.Int).Add(as, u.B)
return &Signature{
S: s,
@ -197,15 +193,19 @@ func Verify(m *big.Int, signature *Signature, q *PublicKey) bool {
// TODO add pending checks
sG := G.Mul(signature.S) // sG
r := new(big.Int).Mod(signature.F.X, N) // r = Fx mod N
rm := new(big.Int).Mul(r, m)
rm = new(big.Int).Mod(rm, N)
rmQ := q.Point().Mul(rm)
rmQF := rmQ.Add(signature.F) // rmQ + F
hBytes := crypto.Keccak256(m.Bytes())
h := new(big.Int).SetBytes(hBytes)
rx := new(big.Int).Mod(signature.F.X, N)
rxh := new(big.Int).Mul(rx, h)
// rxhG := G.Mul(rxh) // originally the paper uses G
rxhG := q.Point().Mul(rxh)
right := signature.F.Add(rxhG)
// check sG == rmQ + F
if bytes.Equal(sG.X.Bytes(), rmQF.X.Bytes()) &&
bytes.Equal(sG.Y.Bytes(), rmQF.Y.Bytes()) {
// check sG == R + rx h(m) G (where R in this code is F)
if bytes.Equal(sG.X.Bytes(), right.X.Bytes()) &&
bytes.Equal(sG.Y.Bytes(), right.Y.Bytes()) {
return true
}
return false

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go.mod
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@ -4,5 +4,6 @@ go 1.14
require (
github.com/btcsuite/btcd v0.0.0-20171128150713-2e60448ffcc6
github.com/ethereum/go-ethereum v1.9.25
github.com/stretchr/testify v1.6.1
)

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go.sum
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@ -1,12 +1,206 @@
github.com/Azure/azure-pipeline-go v0.2.1/go.mod h1:UGSo8XybXnIGZ3epmeBw7Jdz+HiUVpqIlpz/HKHylF4=
github.com/Azure/azure-pipeline-go v0.2.2/go.mod h1:4rQ/NZncSvGqNkkOsNpOU1tgoNuIlp9AfUH5G1tvCHc=
github.com/Azure/azure-storage-blob-go v0.7.0/go.mod h1:f9YQKtsG1nMisotuTPpO0tjNuEjKRYAcJU8/ydDI++4=
github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0=
github.com/Azure/go-autorest/autorest/adal v0.8.0/go.mod h1:Z6vX6WXXuyieHAXwMj0S6HY6e6wcHn37qQMBQlvY3lc=
github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA=
github.com/Azure/go-autorest/autorest/date v0.2.0/go.mod h1:vcORJHLJEh643/Ioh9+vPmf1Ij9AEBM5FuBIXLmIy0g=
github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
github.com/Azure/go-autorest/autorest/mocks v0.2.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
github.com/Azure/go-autorest/autorest/mocks v0.3.0/go.mod h1:a8FDP3DYzQ4RYfVAxAN3SVSiiO77gL2j2ronKKP0syM=
github.com/Azure/go-autorest/logger v0.1.0/go.mod h1:oExouG+K6PryycPJfVSxi/koC6LSNgds39diKLz7Vrc=
github.com/Azure/go-autorest/tracing v0.5.0/go.mod h1:r/s2XiOKccPW3HrqB+W0TQzfbtp2fGCgRFtBroKn4Dk=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
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github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/allegro/bigcache v1.2.1-0.20190218064605-e24eb225f156/go.mod h1:Cb/ax3seSYIx7SuZdm2G2xzfwmv3TPSk2ucNfQESPXM=
github.com/aristanetworks/goarista v0.0.0-20170210015632-ea17b1a17847/go.mod h1:D/tb0zPVXnP7fmsLZjtdUhSsumbK/ij54UXjjVgMGxQ=
github.com/arnaucube/go-blindsecp256k1 v0.0.0-20210110223224-c3e4afc55292 h1:IDrJ98Pv07YozWvwigwK9ygJBa6zsB+H5sHGWLJTrX8=
github.com/aws/aws-sdk-go v1.25.48/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
github.com/btcsuite/btcd v0.0.0-20171128150713-2e60448ffcc6 h1:Eey/GGQ/E5Xp1P2Lyx1qj007hLZfbi0+CoVeJruGCtI=
github.com/btcsuite/btcd v0.0.0-20171128150713-2e60448ffcc6/go.mod h1:Dmm/EzmjnCiweXmzRIAiUWCInVmPgjkzgv5k4tVyXiQ=
github.com/cespare/cp v0.1.0/go.mod h1:SOGHArjBr4JWaSDEVpWpo/hNg6RoKrls6Oh40hiwW+s=
github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
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github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
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github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
github.com/dlclark/regexp2 v1.2.0/go.mod h1:2pZnwuY/m+8K6iRw6wQdMtk+rH5tNGR1i55kozfMjCc=
github.com/docker/docker v1.4.2-0.20180625184442-8e610b2b55bf/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
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github.com/dvyukov/go-fuzz v0.0.0-20200318091601-be3528f3a813/go.mod h1:11Gm+ccJnvAhCNLlf5+cS9KjtbaD5I5zaZpFMsTHWTw=
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github.com/hashicorp/golang-lru v0.5.4/go.mod h1:iADmTwqILo4mZ8BN3D2Q6+9jd8WM5uGBxy+E8yxSoD4=
github.com/holiman/uint256 v1.1.1/go.mod h1:y4ga/t+u+Xwd7CpDgZESaRcWy0I7XMlTMA25ApIH5Jw=
github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
github.com/huin/goupnp v1.0.0/go.mod h1:n9v9KO1tAxYH82qOn+UTIFQDmx5n1Zxd/ClZDMX7Bnc=
github.com/huin/goutil v0.0.0-20170803182201-1ca381bf3150/go.mod h1:PpLOETDnJ0o3iZrZfqZzyLl6l7F3c6L1oWn7OICBi6o=
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github.com/jedisct1/go-minisign v0.0.0-20190909160543-45766022959e/go.mod h1:G1CVv03EnqU1wYL2dFwXxW2An0az9JTl/ZsqXQeBlkU=
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gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=

+ 5
- 0
v0/README.md
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@ -0,0 +1,5 @@
# go-blindsecp256k1/v0
The directory `v0` implements the blind signature over [secp256k1](https://en.bitcoin.it/wiki/Secp256k1), based on *"[An Efficient Blind Signature Scheme Based on the Elliptic Curve Discrete Logarithm Problem](http://www.isecure-journal.com/article_39171_47f9ec605dd3918c2793565ec21fcd7a.pdf)"* paper by by Morteza Nikooghadama & Ali Zakerolhosseini.
The implementation of *"[New Blind Signature Schemes Based on the (Elliptic Curve) Discrete Logarithm Problem](https://sci-hub.do/10.1109/ICCKE.2013.6682844)"* paper by Hamid Mala & Nafiseh Nezhadansari, can be found at the root directory of this repository: https://github.com/arnaucube/go-blindsecp256k1

+ 214
- 0
v0/blindsecp256k1v0.go
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@ -0,0 +1,214 @@
// Package blindsecp256k1v0 implements the Blind signature scheme explained at
// "An Efficient Blind Signature Scheme Based on the Elliptic Curve Discrete
// Logarithm Problem", by Morteza Nikooghadama & Ali Zakerolhosseini
// http://www.isecure-journal.com/article_39171_47f9ec605dd3918c2793565ec21fcd7a.pdf
//
// LICENSE can be found at https://github.com/arnaucube/go-blindsecp256k1/blob/master/LICENSE
//
package blindsecp256k1v0
// WARNING: WIP code
import (
"bytes"
"crypto/rand"
"math/big"
"github.com/btcsuite/btcd/btcec"
)
var (
// G represents the base point of secp256k1
G *Point = &Point{
X: btcec.S256().Gx,
Y: btcec.S256().Gy,
}
// N represents the order of G of secp256k1
N *big.Int = btcec.S256().N
)
// Point represents a point on the secp256k1 curve
type Point struct {
X *big.Int
Y *big.Int
}
// Add performs the Point addition
func (p *Point) Add(q *Point) *Point {
x, y := btcec.S256().Add(p.X, p.Y, q.X, q.Y)
return &Point{
X: x,
Y: y,
}
}
// Mul performs the Point scalar multiplication
func (p *Point) Mul(scalar *big.Int) *Point {
x, y := btcec.S256().ScalarMult(p.X, p.Y, scalar.Bytes())
return &Point{
X: x,
Y: y,
}
}
// WIP
func newRand() *big.Int {
var b [32]byte
_, err := rand.Read(b[:])
if err != nil {
panic(err)
}
bi := new(big.Int).SetBytes(b[:])
return new(big.Int).Mod(bi, N)
}
// PrivateKey represents the signer's private key
type PrivateKey big.Int
// PublicKey represents the signer's public key
type PublicKey Point
// NewPrivateKey returns a new random private key
func NewPrivateKey() *PrivateKey {
k := newRand()
sk := PrivateKey(*k)
return &sk
}
// BigInt returns a *big.Int representation of the PrivateKey
func (sk *PrivateKey) BigInt() *big.Int {
return (*big.Int)(sk)
}
// Public returns the PublicKey from the PrivateKey
func (sk *PrivateKey) Public() *PublicKey {
Q := G.Mul(sk.BigInt())
pk := PublicKey(*Q)
return &pk
}
// Point returns a *Point representation of the PublicKey
func (pk *PublicKey) Point() *Point {
return (*Point)(pk)
}
// SignerPrivateData contains the secret values from the Signer
type SignerPrivateData struct {
D *PrivateKey
K *big.Int
}
// SignerPublicData contains the public values from the Signer (generated from
// its SignerPrivateData)
type SignerPublicData struct {
// Q is the Signer Public Key
Q *PublicKey // = skG
R *Point // = kG
}
// NewSigner returns a new SignerPrivateData with random D & K
func NewSigner() *SignerPrivateData {
sk := NewPrivateKey()
k := newRand()
return &SignerPrivateData{
D: sk,
K: k,
}
}
// PublicData returns the SignerPublicData from the SignerPrivateData
func (signer *SignerPrivateData) PublicData() *SignerPublicData {
return &SignerPublicData{
Q: signer.D.Public(), // Q = dG
R: G.Mul(signer.K), // R = kG
}
}
// BlindSign performs the blind signature on the given mBlinded using
// SignerPrivateData values
func (signer *SignerPrivateData) BlindSign(mBlinded *big.Int) *big.Int {
// TODO add pending checks
// s' = d(m') + k
sBlind := new(big.Int).Add(
new(big.Int).Mul(signer.D.BigInt(), mBlinded),
signer.K)
return sBlind
}
// UserSecretData contains the secret values from the User (a, b, c) and the
// public F
type UserSecretData struct {
A *big.Int
B *big.Int
C *big.Int
F *Point // public
}
// Blind performs the blinding operation on m using SignerPublicData parameters
func Blind(m *big.Int, signer *SignerPublicData) (*big.Int, *UserSecretData) {
u := &UserSecretData{}
u.A = newRand()
u.B = newRand()
u.C = newRand()
binv := new(big.Int).ModInverse(u.B, N)
// F = b^-1 R + a b^-1 Q + c G
bR := signer.R.Mul(binv)
abinv := new(big.Int).Mul(u.A, binv)
abinv = new(big.Int).Mod(abinv, N)
abQ := signer.Q.Point().Mul(abinv)
cG := G.Mul(u.C)
u.F = bR.Add(abQ).Add(cG)
// TODO check F==O
r := new(big.Int).Mod(u.F.X, N)
// m' = br(m)+a
br := new(big.Int).Mul(u.B, r)
brm := new(big.Int).Mul(br, m)
mBlinded := new(big.Int).Add(brm, u.A)
mBlinded = new(big.Int).Mod(mBlinded, N)
return mBlinded, u
}
// Signature contains the signature values S & F
type Signature struct {
S *big.Int
F *Point
}
// Unblind performs the unblinding operation of the blinded signature for the
// given message m and the UserSecretData
func Unblind(sBlind, m *big.Int, u *UserSecretData) *Signature {
// s = b^-1 s' + c
binv := new(big.Int).ModInverse(u.B, N)
bs := new(big.Int).Mul(binv, sBlind)
s := new(big.Int).Add(bs, u.C)
s = new(big.Int).Mod(s, N)
return &Signature{
S: s,
F: u.F,
}
}
// Verify checks the signature of the message m for the given PublicKey
func Verify(m *big.Int, signature *Signature, q *PublicKey) bool {
// TODO add pending checks
sG := G.Mul(signature.S) // sG
r := new(big.Int).Mod(signature.F.X, N) // r = Fx mod N
rm := new(big.Int).Mul(r, m)
rm = new(big.Int).Mod(rm, N)
rmQ := q.Point().Mul(rm)
rmQF := rmQ.Add(signature.F) // rmQ + F
// check sG == rmQ + F
if bytes.Equal(sG.X.Bytes(), rmQF.X.Bytes()) &&
bytes.Equal(sG.Y.Bytes(), rmQF.Y.Bytes()) {
return true
}
return false
}

+ 30
- 0
v0/blindsecp256k1v0_test.go
View File

@ -0,0 +1,30 @@
package blindsecp256k1v0
import (
"math/big"
"testing"
"github.com/stretchr/testify/assert"
)
func TestFlow(t *testing.T) {
// message to be signed
msg := new(big.Int).SetBytes([]byte("test"))
// create new signer
signerPrivateData := NewSigner()
signerPublicData := signerPrivateData.PublicData()
// user blinds the msg
msgBlinded, user := Blind(msg, signerPublicData)
// signer signs the blinded message
sBlind := signerPrivateData.BlindSign(msgBlinded)
// user unblinds the blinded signature
sig := Unblind(sBlind, msg, user)
// signature can be verified with signer PublicKey (Q)
verified := Verify(msg, sig, signerPublicData.Q)
assert.True(t, verified)
}

+ 83
- 7
wasm/blindsecp256k1-wasm.go
View File

@ -5,6 +5,8 @@ import (
"fmt"
"math/big"
"syscall/js"
blindsecp256k1v0 "blindsecp256k1/v0"
)
func main() {
@ -15,6 +17,12 @@ func main() {
}
func registerCallbacks() {
// blindv0 & unblindv0 uses:
// http://www.isecure-journal.com/article_39171_47f9ec605dd3918c2793565ec21fcd7a.pdf
js.Global().Set("blindv0", js.FuncOf(blindv0))
js.Global().Set("unblindv0", js.FuncOf(unblindv0))
// blind & unblind uses: https://sci-hub.do/10.1109/ICCKE.2013.6682844
js.Global().Set("blind", js.FuncOf(blind))
js.Global().Set("unblind", js.FuncOf(unblind))
}
@ -27,6 +35,77 @@ func stringToBigInt(s string) *big.Int {
return b
}
func blindv0(this js.Value, values []js.Value) interface{} {
mStr := values[0].String()
signerQxStr := values[1].String()
signerQyStr := values[2].String()
signerRxStr := values[3].String()
signerRyStr := values[4].String()
m := stringToBigInt(mStr)
signerQx := stringToBigInt(signerQxStr)
signerQy := stringToBigInt(signerQyStr)
signerRx := stringToBigInt(signerRxStr)
signerRy := stringToBigInt(signerRyStr)
signerQ := &blindsecp256k1v0.PublicKey{
X: signerQx,
Y: signerQy,
}
signerR := &blindsecp256k1v0.Point{
X: signerRx,
Y: signerRy,
}
signer := &blindsecp256k1v0.SignerPublicData{signerQ, signerR}
mBlinded, user := blindsecp256k1v0.Blind(m, signer)
r := make(map[string]interface{})
r["mBlinded"] = mBlinded.String()
r["uA"] = user.A.String()
r["uB"] = user.B.String()
r["uC"] = user.C.String()
r["uC"] = user.C.String()
r["uFx"] = user.F.X.String()
r["uFy"] = user.F.Y.String()
return r
}
func unblindv0(this js.Value, values []js.Value) interface{} {
sBlindStr := values[0].String()
mStr := values[1].String()
uBStr := values[2].String()
uCStr := values[3].String()
uFxStr := values[4].String()
uFyStr := values[5].String()
sBlind := stringToBigInt(sBlindStr)
m := stringToBigInt(mStr)
uB := stringToBigInt(uBStr)
uC := stringToBigInt(uCStr)
uFx := stringToBigInt(uFxStr)
uFy := stringToBigInt(uFyStr)
uF := &blindsecp256k1v0.Point{
X: uFx,
Y: uFy,
}
u := &blindsecp256k1v0.UserSecretData{
// A not needed to Unblind
B: uB,
C: uC,
F: uF,
}
sig := blindsecp256k1v0.Unblind(sBlind, m, u)
r := make(map[string]interface{})
r["s"] = sig.S.String()
r["fx"] = sig.F.X.String()
r["fy"] = sig.F.Y.String()
return r
}
func blind(this js.Value, values []js.Value) interface{} {
mStr := values[0].String()
signerQxStr := values[1].String()
@ -56,8 +135,6 @@ func blind(this js.Value, values []js.Value) interface{} {
r["mBlinded"] = mBlinded.String()
r["uA"] = user.A.String()
r["uB"] = user.B.String()
r["uC"] = user.C.String()
r["uC"] = user.C.String()
r["uFx"] = user.F.X.String()
r["uFy"] = user.F.Y.String()
return r
@ -66,15 +143,15 @@ func blind(this js.Value, values []js.Value) interface{} {
func unblind(this js.Value, values []js.Value) interface{} {
sBlindStr := values[0].String()
mStr := values[1].String()
uBStr := values[2].String()
uCStr := values[3].String()
uAStr := values[2].String()
uBStr := values[3].String()
uFxStr := values[4].String()
uFyStr := values[5].String()
sBlind := stringToBigInt(sBlindStr)
m := stringToBigInt(mStr)
uA := stringToBigInt(uAStr)
uB := stringToBigInt(uBStr)
uC := stringToBigInt(uCStr)
uFx := stringToBigInt(uFxStr)
uFy := stringToBigInt(uFyStr)
@ -84,9 +161,8 @@ func unblind(this js.Value, values []js.Value) interface{} {
}
u := &blindsecp256k1.UserSecretData{
// A not needed to Unblind
A: uA,
B: uB,
C: uC,
F: uF,
}

BIN
wasm/webtest/blindsecp256k1.wasm
View File


+ 12
- 1
wasm/webtest/index.js
View File

@ -1,6 +1,7 @@
function test() {
let m = "1952805748";
console.log("using: https://sci-hub.do/10.1109/ICCKE.2013.6682844");
// Q & R would be received from the Signer
let signerQx = "26613296432153871833441195158297038913673464785502568519907582377915678491093";
let signerQy = "81940194042971427014176158889809922552127995083760111384335138546589994227275";
@ -11,6 +12,16 @@ function test() {
// sBlind would be received from the Signer
let sBlind = "7240298625621589352655632414257224668430424461224914067754717095121139699933353374227084479180038954015287518505167995306229258561275087198611946596619855";
let unblindRes = unblind(sBlind, m, blindRes.uB, blindRes.uC, blindRes.uFx, blindRes.uFy);
let unblindRes = unblind(sBlind, m, blindRes.uA, blindRes.uB, blindRes.uFx, blindRes.uFy);
console.log("unblind", unblindRes);
// ---
// v0
console.log("using: http://www.isecure-journal.com/article_39171_47f9ec605dd3918c2793565ec21fcd7a.pdf");
// Q & R would be received from the Signer
blindRes = blindv0(m, signerQx, signerQy, signerRx, signerRy);
console.log("blindv0", blindRes);
// sBlind would be received from the Signer
unblindRes = unblindv0(sBlind, m, blindRes.uB, blindRes.uC, blindRes.uFx, blindRes.uFy);
console.log("unblindv0", unblindRes);
}

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