[SOLVED] What is the Go equivalent of Scala SHA512 hash?

What is the Go equivalent of Scala SHA512 hash?

In Scala we have a part of code that hash a string in SHA512 and then pad the string in Hexadecimal format:

String.format("%032x", new BigInteger(1, MessageDigest.getInstance("SHA-512").digest("MyStringToBeHashed".getBytes("UTF-8"))))

I hash string in Go using crypto package:

package main

import (
        "crypto/sha512"
        "encoding/base64"
)

func main() {
        hasher := sha512.New()
        hasher.Write([]byte("MyStringToBeHashed"))
        sha := base64.URLEncoding.EncodeToString(hasher.Sum(nil))
        sha = fmt.Sprintf("%032x", sha)
        println(sha)
}

In Scala I get the below output:

b0bcb1263862e574e5c9bcb88a3a14884625613410bac4f0be3e3b601a6dee78f5635d0f7b6eb19ba5a1d80142d9ff2678946331874c998226b16e7ff48e53e5

But in Go:

734c79784a6a68693558546c79627934696a6f556945596c5954515175735477766a343759427074376e6a3159313050653236786d365768324146433266386d654a526a4d59644d6d59496d7357355f3949355435513d3d

Solution

The additional base64 encoding is wrong. You either want to show the hash as base64 (i.e. base64(hash)) or you want to show the hash as hex string (i.e. hex(hash)) - but what you do instead is to show the base64 encoded hash as hex string (i.e. hex(base64(hash))). Simply do instead:

    sha := fmt.Sprintf("%032x", hasher.Sum(nil))