Calculate WIF from a private key

cli.go

package main

import (
        "fmt"
        "os"
        "encoding/hex"
        "github.com/mr-tron/base58/base58"
)

func main() {

        exampleBase58Encoded := []string{
                "1QCaxc8hutpdZ62iKZsn1TCG3nh7uPZojq",
                "1DhRmSGnhPjUaVPAj48zgPV9e2oRhAQFUb",
                "17LN2oPYRYsXS9TdYdXCCDvF2FegshLDU2",
                "14h2bDLZSuvRFhUL45VjPHJcW667mmRAAn",
        }

        // If a base58 string is on the command line, then use that instead of the 4 exampels above.
        if len(os.Args) > 1 {
                exampleBase58Encoded = os.Args[1:]
        }

        for _, vv := range exampleBase58Encoded {
                hexbytes, err := hex.DecodeString(vv)
                if err != nil {
                        fmt.Printf("Seems input is not a hex string\n")
                        continue
                }
                num := base58.Encode(hexbytes)
                fmt.Printf("%s\n", num)

        }
}

dowif.sh

#!/bin/bash

# implements this: https://en.bitcoin.it/wiki/Wallet_import_format

EXT=80
EXTKEY=`echo ${EXT}$1`
KEY1=`echo ${EXTKEY} |sha256sum|awk '{print \$1}'`
KEY2=`echo ${KEY1} |sha256sum|awk '{print \$1}'`
CHECKSUM=`echo ${KEY2} |cut -c1-8`
CHECKEDKEY=`echo ${EXTKEY}${CHECKSUM}`
RESULT=`./cli ${CHECKEDKEY}`
echo $RESULT