check_aspnet_passwd.rb

# Ported code from https://stackoverflow.com/questions/46888656/how-to-check-password-in-node-js-from-aspnetusers-net-core
# ruby 2.5.1

require "base64"
require "openssl"

# Value from table AspNetUsers, PasswordHash field
h="AQAAAAEAACcQAAAAEFzA9xEehSfcI4qgvuIPlkAXTzLrPuvVtVDW3g4+QHTR4XoIzXUikDJITOi82f4qWQ=="
h_bytes = Base64.decode64(h)

salt = ''
sub_key = ''

1.upto(h_bytes.length - 1) do |i|
  if (i > 12 && i <= 28)
    salt << h_bytes[i]
  end

  if i > 28
    sub_key << h_bytes[i]
  end
end

# User passwd
pass = 'q123q123'

crypt = OpenSSL::KDF.pbkdf2_hmac(pass, salt: salt, iterations: 10000, length: 256, hash: OpenSSL::Digest::SHA256.new)

if crypt.index(sub_key) == 0
  puts "Passwd patch"
else
  puts "Passwd DO NOT match"
end