Fast (>100MBps) CSPRNG to randomize hard drive before encryption. Compile one time, use without any dependency everywhere with static compilation.

randomize.go

// Based on https://gist.github.com/aeris/2a0f9beeed94102fd0cb2a8caad964d0

package main

import (
	"crypto/aes"
	"crypto/cipher"
	"crypto/rand"
	"encoding/binary"
	"os"
)

func main() {
	BLOCK_SIZE := 1024 * 1024 // 1M
	CIPHER_BLOCK_SIZE := 128

	rndKey := make([]byte, CIPHER_BLOCK_SIZE/8)
	rndIv := make([]byte, CIPHER_BLOCK_SIZE/8)
	rndInput := make([]byte, BLOCK_SIZE)

	for {
		n := 0

		key := rndKey[:16]
		rand.Read(key)
		iv := rndIv[:16]
		rand.Read(iv)

		block, _ := aes.NewCipher(key)
		mode := cipher.NewCBCEncrypter(block, iv)

		var input []byte
		for {
			if n%(100*1024*1024/BLOCK_SIZE) == 0 {
				// Change input each 100M
				input = rndInput[:BLOCK_SIZE]
				rand.Read(input)
			}
			n = n + 1
			mode.CryptBlocks(input, input)
			binary.Write(os.Stdout, binary.BigEndian, input)
			if n%(10*1024*1024*1024/BLOCK_SIZE) == 0 {
				// Change cipher each 10G
				break
			}
		}
	}
}