package main

import (
    "fmt"
    "io/ioutil"

    "golang.org/x/crypto/pkcs12"
)

func check(err error) {
    if err != nil {
        panic(err)
    }
}

func main() {
    certPath := "Certificate.p12"
    pfxData, err := ioutil.ReadFile(certPath)
    check(err)
    password := "invalid"
    blocks, err := pkcs12.ToPEM(pfxData, password)
    check(err)

    fmt.Printf("Number of blocks: %d\n", len(blocks))
}

Number of blocks: 0