c# - 在 c# 中使用 Rfc2898DeriveBytes 在 go 中使用 pbkdf2 生成相同的 key

Question

为什么C#中的Rfc2898DeriveBytes和go lang中的pbkdf2生成不同的key？

我的C#代码

using System;
using System.Security.Cryptography;
using System.Text;

public class Test
{
        private static byte[] passBytes = new byte[]
        {164,176,124,62,244,154,226,211,177,90,202,180,12,142,25,225};

        private static byte[] saltBytes = new byte[]
        {173,205,190,172,239,190,242,63,219,205,173,196,218,171,142,214};

        public static byte[] GetKey()
        {
            var key = new Rfc2898DeriveBytes(Encoding.UTF8.GetString(passBytes, 0, 16), saltBytes).GetBytes(16);
            return key;
        }

    public static void Main()
    {
        System.Console.WriteLine(Convert.ToBase64String(GetKey()));
    }
}

输出: 77U85CphtSEwPP9a2T/jaQ==

---

golang代码

package main

import (

    b64 "encoding/base64"
    "golang.org/x/crypto/pbkdf2"
    "crypto/sha1"

)

var (
    pass[]byte = []byte{164,176,124,62,244,154,226,211,177,90,202,180,12,142,25,225}
    salt[]byte = []byte{173,205,190,172,239,190,242,63,219,205,173,196,218,171,142,214}
)


func getKey() (key[]byte){
    key =  pbkdf2.Key(pass,salt,1000,16,sha1.New)
    return
}


func main() {
    print(b64.StdEncoding.EncodeToString(getKey()))
}

输出: hnuuu+he4aF7vAzA8rfQtw==

我必须做些不同的事情吗？

Answer 1

初始化 C# 实例时，您正在使用不同的变体(采用 UTF-8 string 的构造函数)。此外，正如 zaph 已经指出的那样，您需要对 C# 和 golang 代码使用相同的迭代计数。 golang 版本为 password 和 salt 使用 []byte 参数，而 C# 版本是 Rfc2898DeriveBytes Constructor (Byte[] password, Byte[] salt, Int32 iterations) .

byte[] passBytes = new byte[]
    {164,176,124,62,244,154,226,211,177,90,202,180,12,142,25,225};

byte[] saltBytes = new byte[]
    {173,205,190,172,239,190,242,63,219,205,173,196,218,171,142,214};

var pbkdf2 = new Rfc2898DeriveBytes(passBytes, saltBytes, 1000);
var key = Convert.ToBase64String(pbkdf2.GetBytes(16));

以上代码的输出与golang版本相同。