What version of Go are you using (go version)?

$ go version
go version go1.21.0 windows/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

$ go env
Can provide if necessary, but can't copy-paste right now.
Relevant Info should be in `go version`?

What did you do?

package main

import (
    "os"

    "golang.org/x/crypto/pkcs12" // version 0.12.0 (latest as of time of writing)
)

func main() {
    pfxData, err := os.ReadFile("./path/to/my/pfx")
    if err != nil {
        panic(err)
    }

    _, err := pkcs12.ToPEM(pfxData, "my-password")
    if err != nil {
        panic(err)  // <- error here
    }
}

What did you expect to see?

successfully getting the pem blocks

What did you see instead?

panic: pkcs12: unknown digest algorithm: 2.16.840.1.101.3.4.2.1

It seems like x/crypto does not support the algorithms defined in https://oidref.com/2.16.840.1.101.3.4.2.1
In x/crypto/pkcs12/mac.go verifyMac it expects the macData.Mac.Algorithm.Algorithm to be 1.3.14.3.2.26
and thus errors with "unknown digest algorithm".