/
clientApp.go
171 lines (148 loc) · 3.79 KB
/
clientApp.go
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package main
import (
"bytes"
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"os/exec"
"time"
"github.com/cryptoballot/fdh"
"github.com/cryptoballot/rsablind"
"github.com/fatih/color"
)
func IDs() []Key {
//read the keys stored in /keys directory
keys := readKeys()
return keys
}
func NewID() []Key {
//generate RSA keys pair
reader := rand.Reader
k, err := rsa.GenerateKey(reader, keysize)
check(err)
id := hash(time.Now().String())
savePEMKey(keysDir+"/"+id+"private.pem", k)
savePublicPEMKey(keysDir+"/"+id+"public.pem", k.PublicKey)
var key Key
key.ID = id
key.PrivK = id + "private.pem"
key.PubK = id + "public.pem"
time.Sleep(time.Second * 2)
b, err := ioutil.ReadFile(keysDir + "/" + key.PubK)
if err != nil {
fmt.Print(err)
}
key.PublicKey = string(b)
key.Date = time.Now()
fmt.Println(key.PublicKey)
keys := readKeys()
keys = append(keys, key)
saveKeys(keys)
return keys
}
type AskBlindSign struct {
M []byte `json:"m"`
}
type SignResponse struct {
Sig []byte `json:"sig"`
PubK rsa.PublicKey `json:"pubK"`
}
func BlindAndSendToSign(keyID string) []Key {
//get the key
key := getKeyByKeyID(keyID)
pubK, err := openPublicPEMKey(keysDir + "/" + key.PubK)
check(err)
//pubK to string
m, err := ExportRsaPublicKeyAsPemStr(pubK)
check(err)
mB := []byte(m)
//get serverPubK
var serverPubK *rsa.PublicKey
res, err := http.Get(config.Server)
check(err)
decoder := json.NewDecoder(res.Body)
err = decoder.Decode(&serverPubK)
if err != nil {
panic(err)
}
defer res.Body.Close()
//blind the hashed message
hashed := fdh.Sum(crypto.SHA256, hashize, mB)
blinded, unblinder, err := rsablind.Blind(serverPubK, hashed)
if err != nil {
panic(err)
}
var askBlindSign AskBlindSign
askBlindSign.M = blinded
//send blinded to serverIDsigner
body := new(bytes.Buffer)
json.NewEncoder(body).Encode(askBlindSign)
res, err = http.Post(config.Server+"blindsign", "application/json", body)
check(err)
var signResponse SignResponse
decoder = json.NewDecoder(res.Body)
err = decoder.Decode(&signResponse)
if err != nil {
panic(err)
}
defer res.Body.Close()
sig := signResponse.Sig
//unblind the signedblind
unblindedSig := rsablind.Unblind(serverPubK, sig, unblinder)
color.Green("unblindedSig")
fmt.Println(unblindedSig)
// Verify the original hashed message against the unblinded signature
if err := rsablind.VerifyBlindSignature(serverPubK, hashed, unblindedSig); err != nil {
fmt.Println(err)
} else {
color.Green("blind signature verified")
key.Verified = true
}
key.UnblindedSig = unblindedSig
key.Hashed = hashed
key.ServerVerifier = serverPubK
saveKey(key)
keys := readKeys()
return keys
}
func Verify(packPubK string) {
return
}
func Delete(keyID string) []Key {
originalKeys := readKeys()
//remove key .pem files
key := getKeyByKeyID(keyID)
_, err := exec.Command("rm", keysDir+"/"+key.PrivK).CombinedOutput()
check(err)
_, err = exec.Command("rm", keysDir+"/"+key.PubK).CombinedOutput()
check(err)
//remove key from keys.json
keys := removeKey(keyID, originalKeys)
saveKeys(keys)
return keys
}
func Encrypt(keyID string, encryptData EncryptData) EncryptData {
key := getKeyByKeyID(keyID)
pubK, err := openPublicPEMKey(keysDir + "/" + key.PubK)
check(err)
out, err := rsa.EncryptOAEP(sha1.New(), rand.Reader, &pubK, []byte(encryptData.M), []byte("orders"))
check(err)
fmt.Println(string(out))
encryptData.C = out
return encryptData
}
func Decrypt(keyID string, encryptData EncryptData) EncryptData {
key := getKeyByKeyID(keyID)
privK, err := openPEMKey(keysDir + "/" + key.PrivK)
check(err)
out, err := rsa.DecryptOAEP(sha1.New(), rand.Reader, privK, []byte(encryptData.C), []byte("orders"))
check(err)
fmt.Println(string(out))
encryptData.M = string(out)
return encryptData
}