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HomeBackend DevelopmentGolangHow to simulate password hashing of pbkdf2-scala in Golang pbkdf2

如何在Golang pbkdf2中模拟pbkdf2-scala的密码哈希

问题内容

我们的应用程序使用库 securehash 对象来创建单向密码: https://github.com/nremond/pbkdf2-scala/blob/master/src/main/scala/io/github/nremond/securehash.scala

现在我的问题是我在 go 中的代码返回 -1 进行密码检查。

package main

import (
    "bytes"
    "crypto/rand"
    "crypto/sha512"
    "fmt"
    "golang.org/x/crypto/pbkdf2"
    "math/big"
    "strings"
)

func main() {
    iteration := 25000

    // Hash User input
    password := []byte("123")
    salt := "yCyQMMMBt1TuPa1F9FeKfT0yrNIF8tLB"
    key := pbkdf2.Key(password, []byte(salt), iteration, sha512.Size, sha512.New)

    // COMPARE PASSWORD fetched from DB
        // 123 hash in scala
    tokenS := strings.Split("$pbkdf2-sha512$25000$yCyQMMMBt1TuPa1F9FeKfT0yrNIF8tLB$TtQt5BZLs4qlA0YAkcGukZwu7pkxOLcxwuoQB3qNtxM", "$")
    passwordHashInDatabase := tokenS[4]
    out := bytes.Compare(key, []byte(passwordHashInDatabase))
    fmt.Println("out: ", out)
}

正确答案


您有几个问题:

  • 在将盐传递给 pbkdf2.key() 之前,您不会对盐进行 base64 解码,并且在将其与 pbkdf2.key() 的结果进行比较之前,您不会对从数据库获取的密钥进行 base64 解码。另请注意,scala 实现在 base64 解码/编码之前/之后进行了一些字符替换。这也需要在 go 实现中复制。

  • scala 实现中的 createhash() 方法有一个 dklength 参数,默认为 32。在 go 实现中,您提供的是 sha512.size 的结果,它是 64 并且不匹配。我知道使用了默认值,因为数据库中的值是 32 字节长。

这是一个仓促修复的实现:

package main

import (
    "bytes"
    "crypto/sha512"
    "encoding/base64"
    "fmt"
    "log"
    "strings"

    "golang.org/x/crypto/pbkdf2"
)

func b64decode(s string) ([]byte, error) {
    s = strings.replaceall(s, ".", "+")
    return base64.rawstdencoding.decodestring(s)
}

func main() {
    iteration := 25000

    // hash user input
    password := []byte("123")
    salt, err := b64decode("ycyqmmmbt1tupa1f9fekft0yrnif8tlb")
    if err != nil {
        log.fatal("failed to base64 decode the salt: %s", err)
    }
    key := pbkdf2.key(password, salt, iteration, 32, sha512.new)

    // compare password fetched from db
    // 123 hash in scala
    tokens := strings.split("$pbkdf2-sha512$25000$ycyqmmmbt1tupa1f9fekft0yrnif8tlb$ttqt5bzls4qla0yakcgukzwu7pkxolcxwuoqb3qntxm", "$")
    passwordhashindatabase, err := b64decode(tokens[4])
    if err != nil {
        log.fatal("failed to base64 decode password hash from the database: %s", err)
    }
    fmt.printf("%x\n%x\n", key, passwordhashindatabase)
    fmt.printf("%d\n%d\n", len(key), len(passwordhashindatabase))
    out := bytes.compare(key, passwordhashindatabase)
    fmt.println("out: ", out)
}

输出:

4ed42de4164bb38aa503460091c1ae919c2eee993138b731c2ea10077a8db713
4ed42de4164bb38aa503460091c1ae919c2eee993138b731c2ea10077a8db713
32
32
out:  0

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