// -*- go -*-
//
// Copyright (c) 2020-2021 Markku Rossi
//
// All rights reserved.
//

// Package rsa implements RSA encrypt and decrypt operations. The
// practical key sizes are <= 512 bits i.e. this must not be used in
// any real life applications.
package rsa

import (
	"math"
)

const (
	// E65537 is the public RSA exponent 2^16+1.
	E65537 = 0x10001
)

// Encrypt encrypts the message with the public key {e, n}.
//   cipher = msg**e mod n
func Encrypt(msg, e, n uint) uint {
	return math.Exp(msg, e, n)
}

// Decrypt decrypts the cipher text with the private key {d, n}.
//   message = cipher**d mod n
func Decrypt(cipher, d, n uint) uint {
	return math.Exp(cipher, d, n)
}