Golang - Base64 with different index table

base64table.go

package main

import (
	"encoding/base64"
	"fmt"
)

func base64Enc(buffer []byte, base64Table string) []byte {

	// encode the buffer with the provided base64 index table
	encoder := base64.NewEncoding(base64Table)
	encodedBuffer := make([]byte, encoder.EncodedLen(len(buffer)))
	encoder.Encode(encodedBuffer, buffer)

	return encodedBuffer
}

func base64Dec(buffer []byte, base64Table string) []byte {
	
	// decode the buffer with the procided base64 index table
	decoder := base64.NewEncoding(base64Table)
	decodedBuffer := make([]byte, decoder.DecodedLen(len(buffer)))
	
	// ignoring CorruptInputError
	realLength, _ := decoder.Decode(decodedBuffer, buffer)
	
	return decodedBuffer[:realLength]
}

func main() {

	base64Table := "HJIA/CB+FGKLNOP3RSlUVWXYZfbcdeaghi5kmn0pqrstuvwx89o12467MEDyzQjT"

	encodedTest := base64Enc([]byte("testme"), base64Table)
	
	decodedTest := base64Dec(encodedTest, base64Table)
	
	fmt.Println("Encoded: ", string(encodedTest))
	fmt.Println("Decoded: ", string(decodedTest))

}

Test it here: https://play.golang.org/p/fFFlDsEsLGx