Base 64 encode and decode a byte array in Golang. https://play.golang.org/p/X4z9zq0nXlW

base64.go

package main

import (
	"fmt"
	"encoding/base64"
)

func main() {
	str := "Hello, playground :)"
	
	b := Base64Encode([]byte(str))
	fmt.Printf("%q\n", b)
	
	msg, err := Base64Decode(b)
	if err != nil {
		fmt.Println(err)
		return
	}
	
	fmt.Printf("%q\n", msg)
}

func Base64Encode(message []byte) []byte {
	b := make([]byte, base64.StdEncoding.EncodedLen(len(message)))
	base64.StdEncoding.Encode(b, message)
	return b
}

func Base64Decode(message []byte) (b []byte, err error) {
	var l int
	b = make([]byte, base64.StdEncoding.DecodedLen(len(message)))
	l, err = base64.StdEncoding.Decode(b, message)
	if err != nil {
		return
	}
	return b[:l], nil
}

Decoding is a non-obvious task since you must estimate the size of the resulting byte slice and trim off any remaining \x00 null bytes.

If working with strings, this is already handled for you in the stdlib:

https://golang.org/pkg/encoding/base64/#Encoding.DecodeString

func Base64Encode(src []byte) []byte {
    return []byte(base64.StdEncoding.EncodeToString(src))
}

func Base64Decode(src []byte) ([]byte, error) {
    return base64.StdEncoding.DecodeString(string(src))
}

thanks 👍

Maybe this would make sense as an example in the official docs? (the byte decoding)

Saved my day! Thanks

I am trying to Decode a base64 encoded byte array. But when I convert it to a string variable and pass it to DecodeString() function, then it always gives me the CorruptInputError. But when I get the string value and pass it into the DecodeString() function, then it does the decoding smoothly.

Any help is much appreciated...