Alisson alissonmarcs

#OpenSSL Basics

##Certificate Types

CA Certificate Authority
CRL Certificate Revocation List
CSR Certificate Signing Request
DCA Deligate Certificate Authority
DER Data Encryption Standard
DES Data Encryption Standard
DH Diffie-Hellmann

General OpenSSL Commands

These commands allow you to generate CSRs, Certificates, Private Keys and do other miscellaneous tasks.

Generate a new private key and Certificate Signing Request

openssl req -out CSR.csr -new -newkey rsa:2048 -nodes -keyout privateKey.key

How to setup your own CA with OpenSSL

For educational reasons I've decided to create my own CA. Here is what I learned.

First things first

Lets get some context first.

Common Options

-#, --progress-bar Make curl display a simple progress bar instead of the more informational standard meter.

-b, --cookie <name=data> Supply cookie with request. If no =, then specifies the cookie file to use (see -c).

-c, --cookie-jar <file name> File to save response cookies to.

Create Root CA (Done once)

Create Root Key

Attention: this is the key used to sign the certificate requests, anyone holding this can sign certificates on your behalf. So keep it in a safe place!

openssl genrsa -des3 -out rootCA.key 4096

How To change baseUri:

in application.properties add:

spring.data.rest.basePath=/api

or -

in application.yml add:

Open a webpage that uses the CA with Firefox
Click the lock-icon in the addressbar -> show information -> show certificate
the certificate viewer will open
click details and choose the certificate of the certificate-chain, you want to import to CentOS
click "Export..." and save it as .crt file
Copy the .crt file to /etc/pki/ca-trust/source/anchors on your CentOS machine
run update-ca-trust extract
test it with wget https://thewebsite.org

	/* Binary Search Tree Implementation in C */
	/* Harish R */

	#include<stdio.h>
	#include<stdlib.h>

	struct TreeNode
	{
	int data;
	struct TreeNode* left;

	/**
	* This are a collection of examples for C 201.
	* These combine concepts you may or may not be
	* familiar with and are especially useful for
	* students new to C. There is a lot of really
	* cool stuff you can do in C without any cool
	* languages.
	*
	* This is file in particular is an introduction
	* to fun function usage in C.

	/**
	* dwmconfig.h
	* Hardware multimedia keys
	*/
	/* Somewhere at the beginning of config.h include: */

	/*
	You obviously need the X11 development packages installed, X11proto in particular, but
	here is the location of the keysyms header upstream copy if you can't bother
	using the contents of your own hard drive. ;-P