Go - 如何从字符串设置 RSA 公钥模数？

Question

我正在尝试使用 Go 的RSA包加密密码。

这是我到目前为止所拥有的：

package main

import (

    "fmt"

    "time"

    "net/http"

    "strconv"

    "io/ioutil"

    "encoding/json"

    "errors"

    "crypto/rsa"

    "crypto/rand"

    //"math/big"

)

func main() {

    if err := Login("username", "password"); err != nil {

        fmt.Println(err)

    }

}

func Login(username, password string) error {

    doNotCache := strconv.FormatInt(time.Now().UnixNano() / int64(time.Millisecond), 10)

    // Get RSA Key

    resp, err := http.PostForm("https://steamcommunity.com/login/getrsakey/", map[string][]string{

        "donotcache": {doNotCache},

        "username": {username},

    })

    if err != nil {

        return err

    }

    content, err := ioutil.ReadAll(resp.Body)

    if err != nil {

        return err

    }

    var decoded map[string]interface{}

    err = json.Unmarshal(content, &decoded)

    if err != nil {

        return err

    }

    if decoded["success"] != true {

        return errors.New("Failed to retrieve RSA key.")

    }

    // Set encryption variables

    var privateKey *rsa.PrivateKey

    var publicKey *rsa.PublicKey

    var plain_text, encrypted []byte

    plain_text = []byte(password)

    // Generate Private Key

    if privateKey, err = rsa.GenerateKey(rand.Reader, 1024); err != nil {

        return err

    }

    privateKey.Precompute()

    if err = privateKey.Validate(); err != nil {

        return err

    }

    publicKey.N = decoded["publickey_mod"].(string) // <- This is not right, I need to create a modulus from the publickey_mod string and it needs to be of type big.Int

    publicKey.E = decoded["publickey_exp"].(int)

    encrypted, err = rsa.EncryptPKCS1v15(rand.Reader, publicKey, plain_text)

    if err != nil {

        return err

    }

    fmt.Printf("PKCS1 Encrypted [%s] to \n[%x]\n", string(plain_text), encrypted)

    return nil

}

我无法从给定的字符串将 publicKey.N 值设置为 big.Int。

和变量decoded["publickey_mod"]看起来像010001

我正在尝试为https://steamcommunity.com/加密此密码。

Answer 1

decoded["publickey_mod"] 是十六进制字符串，您需要将其转换为 big.Int：publicKey.N, _ = new(big.Int).SetString(decoded["publickey_mod"].(string), 16 /* = base 16 */)// json numbers are float64 by default unless you use a struct and force a typepublicKey.E = int(decoded["publickey_exp"].(float64))