/
server.go
199 lines (173 loc) · 5.92 KB
/
server.go
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// SPDX-License-Identifier: MIT
//
// Copyright (C) 2020-2022 Daniel Bourdrez. All Rights Reserved.
//
// This source code is licensed under the MIT license found in the
// LICENSE file in the root directory of this source tree or at
// https://spdx.org/licenses/MIT.html
package oprf
import (
"crypto/sha256"
"encoding/json"
"fmt"
"github.com/Jan-nku/opaque/internal/encoding"
group "github.com/bytemare/crypto"
"math/big"
"net/http"
)
// New: add oprf Server
type Server struct {
blind *group.Scalar
Identifier
}
// Evaluate evaluates the blinded input with the given key.
func (i Identifier) Evaluate(privateKey *group.Scalar, blindedElement *group.Element) *group.Element {
return blindedElement.Copy().Multiply(privateKey)
}
// New: add server blind func
func (s *Server) Blind(blindedElement *group.Element) *group.Element {
if s.blind == nil {
s.blind = s.Group().NewScalar().Random()
}
return blindedElement.Copy().Multiply(s.blind)
}
// New: add server unblind func
func (s *Server) UnBlind(blindedElement *group.Element) *group.Element {
invert := s.blind.Copy().Invert()
u := blindedElement.Copy().Multiply(invert)
return u
}
func (s *Server) ServiceReg(a1 *group.Element, a2 *group.Element, client *http.Client) *group.Element {
str_a1 := encoding.ByteArrayToBase64String(a1.Encode())
str_a2 := encoding.ByteArrayToBase64String(a2.Encode())
url := "https://123.249.125.222/reg?a1=" + str_a1 + "&a2=" + str_a2
// 发送HTTPS GET请求
response, err := client.Get(url)
if err != nil {
fmt.Println("无法发送请求:", err)
}
defer response.Body.Close()
// 检查响应的状态码
if response.StatusCode != http.StatusOK {
fmt.Println("请求失败,状态码:", response.StatusCode)
}
// 解码JSON响应
var data map[string]interface{}
decoder := json.NewDecoder(response.Body)
if err := decoder.Decode(&data); err != nil {
fmt.Println("解码JSON失败:", err)
}
blindedMessage := s.Group().NewElement()
if err := blindedMessage.Decode(encoding.Base64StringToByteArray(data["beta"].(string))); err != nil {
return nil
}
//ZKP Verify process, h = g ^ kc1
h := s.Group().NewElement()
if err := h.Decode(encoding.Base64StringToByteArray(data["h"].(string))); err != nil {
return nil
}
x1 := s.Group().NewElement()
if err := x1.Decode(encoding.Base64StringToByteArray(data["x1"].(string))); err != nil {
return nil
}
x2 := s.Group().NewElement()
if err := x2.Decode(encoding.Base64StringToByteArray(data["x2"].(string))); err != nil {
return nil
}
k1 := s.Group().NewScalar()
if err := k1.Decode(encoding.Base64StringToByteArray(data["k1"].(string))); err != nil {
return nil
}
k2 := s.Group().NewScalar()
if err := k2.Decode(encoding.Base64StringToByteArray(data["k2"].(string))); err != nil {
return nil
}
//compute hash result c
str := "1:AwpljT4HsBVSyWx1Pem9S9cgMuJ9FSuAboqjPOWhGvS3" + data["h"].(string) + str_a1 + str_a2 + data["beta"].(string) + data["x1"].(string) + data["x2"].(string)
sha256Hash := sha256.Sum256([]byte(str))
hashInt := new(big.Int)
hashInt.SetBytes(sha256Hash[:])
c := s.Group().NewScalar()
if err := c.SetInt(hashInt); err != nil {
return nil
}
left := a1.Copy().Multiply(k1).Add(a2.Copy().Multiply(k2))
right := x1.Add(x2).Add(blindedMessage.Copy().Multiply(c))
/* if left.Equal(right) == 1 {
fmt.Println("Zero knowledge proof is correct.")
} else {
fmt.Println("Zero knowledge proof is not correct.")
}*/
if left.Equal(right) != 1 {
return nil
}
return blindedMessage
}
func (s *Server) ServiceLogin(a1, a2, tau1, tau2 *group.Element, client *http.Client) *group.Element {
str_a1 := encoding.ByteArrayToBase64String(a1.Encode())
str_a2 := encoding.ByteArrayToBase64String(a2.Encode())
str_tau1 := encoding.ByteArrayToBase64String(tau1.Encode())
str_tau2 := encoding.ByteArrayToBase64String(tau2.Encode())
url := "https://123.249.125.222/login?a1=" + str_a1 + "&a2=" + str_a2 + "&t1=" + str_tau1 + "&t2=" + str_tau2
// 发送HTTPS GET请求
response, err := client.Get(url)
if err != nil {
fmt.Println("无法发送请求:", err)
}
defer response.Body.Close()
// 检查响应的状态码
if response.StatusCode != http.StatusOK {
fmt.Println("请求失败,状态码:", response.StatusCode)
}
// 解码JSON响应
var data map[string]interface{}
decoder := json.NewDecoder(response.Body)
if err := decoder.Decode(&data); err != nil {
fmt.Println("解码JSON失败:", err)
}
blindedMessage := s.Group().NewElement()
if err := blindedMessage.Decode(encoding.Base64StringToByteArray(data["beta"].(string))); err != nil {
return nil
}
//ZKP Verify process, h = g ^ kc1
h := s.Group().NewElement()
if err := h.Decode(encoding.Base64StringToByteArray(data["h"].(string))); err != nil {
return nil
}
x1 := s.Group().NewElement()
if err := x1.Decode(encoding.Base64StringToByteArray(data["x1"].(string))); err != nil {
return nil
}
x2 := s.Group().NewElement()
if err := x2.Decode(encoding.Base64StringToByteArray(data["x2"].(string))); err != nil {
return nil
}
k1 := s.Group().NewScalar()
if err := k1.Decode(encoding.Base64StringToByteArray(data["k1"].(string))); err != nil {
return nil
}
k2 := s.Group().NewScalar()
if err := k2.Decode(encoding.Base64StringToByteArray(data["k2"].(string))); err != nil {
return nil
}
//compute hash result c
str := "1:AwpljT4HsBVSyWx1Pem9S9cgMuJ9FSuAboqjPOWhGvS3" + data["h"].(string) + str_a1 + str_a2 + data["beta"].(string) + data["x1"].(string) + data["x2"].(string)
sha256Hash := sha256.Sum256([]byte(str))
hashInt := new(big.Int)
hashInt.SetBytes(sha256Hash[:])
c := s.Group().NewScalar()
if err := c.SetInt(hashInt); err != nil {
return nil
}
left := a1.Copy().Multiply(k1).Add(a2.Copy().Multiply(k2))
right := x1.Add(x2).Add(blindedMessage.Copy().Multiply(c))
/* if left.Equal(right) == 1 {
fmt.Println("Zero knowledge proof is correct.")
} else {
fmt.Println("Zero knowledge proof is not correct.")
}*/
if left.Equal(right) != 1 {
return nil
}
return blindedMessage
}