simple RC4 encryption routine with build flags for keyword

rc4.go

//
// simple RC4 encryption routine with build flags for keyword, 02.05.2018
//
package main

import (
	"crypto/rc4"
	"fmt"
)

//overwrite key with build flags
var sesame = "csharp"

func enc(data []byte, key string) ([]byte, error) {

	c, err := rc4.NewCipher([]byte(key))
	if err != nil {
		fmt.Printf("%v\n", err)
		return nil, err
	}
	src := make([]byte, len(data))
	c.XORKeyStream(src, data)
	c.Reset()
	fmt.Printf("after encoding, src=% x\n", src)
	return src, nil
}

func main() {
	value := "This data will be encrypted"
	encoded, _ := enc([]byte(value), sesame)
	decoded, _ := enc([]byte(encoded), sesame)

	fmt.Printf("encoded: %s\n", encoded)
	fmt.Printf("decoded: %s\n", decoded)

	fmt.Printf("debug sesam  : %s\n", sesame)
}

//go build -ldflags="-s -w -X main.sesame=golang" rc4.go