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Jérôme Desboeufs jdesboeufs

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@joepie91
joepie91 / random.md
Last active July 2, 2024 01:17
Secure random values (in Node.js)

Not all random values are created equal - for security-related code, you need a specific kind of random value.

A summary of this article, if you don't want to read the entire thing:

  • Don't use Math.random(). There are extremely few cases where Math.random() is the right answer. Don't use it, unless you've read this entire article, and determined that it's necessary for your case.
  • Don't use crypto.getRandomBytes directly. While it's a CSPRNG, it's easy to bias the result when 'transforming' it, such that the output becomes more predictable.
  • If you want to generate random tokens or API keys: Use uuid, specifically the uuid.v4() method. Avoid node-uuid - it's not the same package, and doesn't produce reliably secure random values.
  • If you want to generate random numbers in a range: Use random-number-csprng.

You should seriously consider reading the entire article, though - it's

@gwillem
gwillem / ansible-bootstrap-ubuntu-16.04.yml
Created June 16, 2016 21:59
Get Ansible to work on bare Ubuntu 16.04 without python 2.7
# Add this snippet to the top of your playbook.
# It will install python2 if missing (but checks first so no expensive repeated apt updates)
# gwillem@gmail.com
- hosts: all
gather_facts: False
tasks:
- name: install python 2
raw: test -e /usr/bin/python || (apt -y update && apt install -y python-minimal)
@thlorenz
thlorenz / update_to_nan_v2.0.x.sh
Last active October 13, 2016 08:04
Script to update Node.js addons to work with nan 2.0.x and thus with iojs v3.x (gets you 90% there)
#!/bin/bash
replacements=(
"NanAsyncWorker/Nan::AsyncWorker"
"NanAsyncQueueWorker/Nan::AsyncQueueWorker"
"NanCallback/Nan::Callback"
"NanSetInternalFieldPointer/Nan::SetInternalFieldPointer"
"NanGetInternalFieldPointer/Nan::GetInternalFieldPointer"
"NanNewBufferHandle\\(([^;]+);/Nan::NewBuffer(\\1.ToLocalChecked();"
"(NanNew(<(v8::)?String>)?\\(\"[^\"]*\"\\))/\\1.ToLocalChecked()"