Amr Ali amrali

YubiKey 4 series GPG and SSH setup guide

Written for fairly adept technical users, preferably of Debian GNU/Linux, not for absolute beginners.

You'll probably be working with a single smartcard, so you'll want only one primary key (1. Sign & Certify) and two associated subkeys (2. Encrypt, 3. Authenticate).

	from base58 import b58encode_check
	from hashlib import blake2b

	prefix = lambda x: b'\x36\xf0\x2c\x34' + x
	data = b'hello world'
	md32 = blake2b(data, digest_size=32).digest()
	md64 = blake2b(data, digest_size=64).digest()
	encoded_md32 = b58encode_check(prefix(md32))
	encoded_md64 = b58encode_check(prefix(md64))

	// Example program
	#include <iostream>
	#include <string>
	#include <vector>
	#include <type_traits>

	//---------------------
	// Maybe and MyVector, two totally unrelated classes whose only commanilty is that they are both type constructors of the same arity (e.g. 1) and order (e.g. 1).
	//---------------------
	template< typename T >

	### Keybase proof

	I hereby claim:

	* I am amrali on github.
	* I am d4de (https://keybase.io/d4de) on keybase.
	* I have a public key ASCNhEboNTHV0lsmYqwanCCVMcWxzhzf82HMwuS2iZODIQo

	To claim this, I am signing this object:

	crypto = require 'crypto'
	md5sum = crypto.createHash 'md5'

	pkey = 'Base64 encoded public key goes here'
	data = Buffer(key, 'base64').toString 'binary'
	md5sum.update data

	fingerprint = md5sum.digest 'hex'
	fingerprint = ("#{fingerprint[i]}#{fingerprint[i + 1]}" for i in [0...fingerprint.length] when i % 2 is 0).join ':'