Burn CPU cycles by running AES encryption in a loop. Useful for draining battery quickly and doing power tests.

spin.go

package main

import (
	"crypto/aes"
	"crypto/cipher"
	"crypto/rand"
	"io"
	"sync"
)

func main() {
	var wg sync.WaitGroup
	wg.Add(1)
	for i := 0; i < 8; i++ {
		go spin()
	}
	wg.Wait()
}

func spin() {
	key := genKey()
	blockCipher, err := aes.NewCipher(key)
	if err != nil {
		panic(err)
	}
	iv := genIv()
	stream := cipher.NewCTR(blockCipher, iv)
	buf := make([]byte, 16)
	for {
		for i := 0; i < 16; i++ {
			buf[i] = 0
		}
		stream.XORKeyStream(buf, buf)
	}
}

func genKey() []byte {
	key := make([]byte, 32)
	_, err := io.ReadFull(rand.Reader, key)
	if err != nil {
		panic(err)
	}
	return key
}

func genIv() []byte {
	iv := make([]byte, 16)
	_, err := io.ReadFull(rand.Reader, iv)
	if err != nil {
		panic(err)
	}
	return iv
}