#cryptography code explainers

java

public final class HmacJwt {
 
    private static final ObjectMapper MAPPER = new ObjectMapper();
    private static final Base64.Encoder ENCODER = Base64.getUrlEncoder().withoutPadding();

How HMAC-signed JWTs are created and verified

jwt hmac cryptography

Intermediate 9 steps

python

import base64
import hashlib
import hmac
import os

How TOTP two-factor codes work

totp hmac authentication

Intermediate 7 steps

ruby

require "openssl"
require "json"
require "base64"

Building signed session tokens in Ruby

hmac authentication cryptography

Intermediate 8 steps

go

package security
 
import (
	"crypto/hmac"

Signing and verifying payloads with HMAC in Go

hmac cryptography authentication

Intermediate 5 steps

python

import base64
import hashlib
import hmac
import json

Building signed expiring tokens with HMAC

hmac authentication base64

Intermediate 7 steps

java

public final class AesGcmCipher {
 
    private static final String TRANSFORMATION = "AES/GCM/NoPadding";
    private static final int GCM_TAG_BITS = 128;

Authenticated encryption with AES-GCM in Java

cryptography aes-gcm authenticated-encryption

Intermediate 7 steps

java

package com.example.security;
 
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;

Salted password hashing with PBKDF2 in Java

password-hashing pbkdf2 salting

Intermediate 7 steps

go

package token
 
import (
	"crypto/rand"

Generating secure random tokens in Go

cryptography randomness encoding

Intermediate 5 steps

ruby

require "openssl"
require "base64"
 
module WebhookSignature

Signing and verifying webhooks in Ruby

hmac cryptography webhooks

Intermediate 7 steps

php

<?php
 
function verifyJwt(string $token, string $secret): array
{

Verifying an HS256 JWT in PHP

jwt hmac authentication

Intermediate 9 steps