Fast (>100MBps) CSPRNG to randomize hard drive before encryption

randomize.rb

#!/usr/bin/env ruby
require 'openssl'

BLOCK_SIZE = 1024*1024 # 1M
CIPHER_BLOCK_SIZE = 128
loop do
	n = 0

	cipher = OpenSSL::Cipher::AES.new CIPHER_BLOCK_SIZE, :CBC
	cipher.encrypt
	cipher.key = OpenSSL::Random.pseudo_bytes CIPHER_BLOCK_SIZE / 8
	cipher.iv = OpenSSL::Random.pseudo_bytes CIPHER_BLOCK_SIZE / 8

	input = nil, 0
	loop do
		if n % (100*1024*1024/BLOCK_SIZE) == 0
			# Change input each 100M
			input = OpenSSL::Random.pseudo_bytes BLOCK_SIZE / 8
		end
		n += 1
	 	print cipher.update input
		if  n % (10*1024*1024*1024/BLOCK_SIZE) == 0
			# Change cipher each 10G
			break
		end
	end
end

Hi, very interesting. I just ported it to Go (compiled one time, used without any dependency everywhere with static compilation).
https://gist.github.com/lolo32/8743fc74739887aa391f710036716cbb