Golang raw RSA encryption (no padding) RSA_NO_PADDING

main.go

package main
import (
	"crypto/rsa"
	"fmt"
	"math/big"
)

var RSA_PublicKeyString string = "109120132967399429278860960508995541528237502902798129123468757937266291492576446330739696001110603907230888610072655818825358503429057592827629436413108566029093628212635953836686562675849720620786279431090218017681061521755056710823876476444260558147179707119674283982419152118103759076030616683978566631413"
var Public_RSA_Key = rsa.PublicKey{
	N: fromBase10(RSA_PublicKeyString),
	E: 65537,
}

func fromBase10(base10 string) *big.Int {
	i, ok := new(big.Int).SetString(base10, 10)
	if !ok {
		panic("Bad number: %s" + base10)
	}
	return i
}
func encrypt_RSA(pub *rsa.PublicKey, data []byte) []byte {
	encrypted := new(big.Int)
	e := big.NewInt(int64(pub.E))
	payload := new(big.Int).SetBytes(data)
	encrypted.Exp(payload, e, pub.N)
	return encrypted.Bytes()
}
func main() {
	packet := make([]byte, 12)
	for i := 0; i < len(packet); i++ {
		packet[i] = 5
	}
	encrypted := encrypt_RSA(&Public_RSA_Key, packet)
	fmt.Printf("packet: %x \n encrypted: %x / %d", packet, encrypted, len(encrypted))
}