#! /usr/bin/env python3
# encoding: utf-8

# ----------------------------------------------------------------

def flatten_dict(root, glue=" ", prefix=[]):
	lines = []
	
	for k, v in root.items():
		new_prefix = prefix + [k]
		
		if type(v) == dict:
			lines.extend(flatten_dict(v, glue, new_prefix))
		else:
			lines.append((glue.join(new_prefix), v))
	
	return lines

# ----------------------------------------------------------------

import random

PASSPHRASE_VOWELS = "aeiuAEU"
PASSPHRASE_CONSONANTS = "bcdfghjkmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ23456789"

def random_bytes(length):
	return open("/dev/urandom", "rb").read(length)

def random_syllable():
	return random.choice(PASSPHRASE_CONSONANTS) + random.choice(PASSPHRASE_VOWELS) + random.choice(PASSPHRASE_CONSONANTS)

def random_word(syllables=3):
	parts = []
	
	for _ in range(syllables):
		parts.append(random_syllable())
	
	return "".join(parts)

# ----------------------------------------------------------------

import hashlib

def hash_password(p, hexdigest=True):
	h = hashlib.blake2b()
	
	h.update(p.encode("utf-8"))
	
	return h.hexdigest() if hexdigest else h.digest()

# ----------------------------------------------------------------

def raw_to_hex(raw, separator=" "):
	"""
	Converts a bytearray (or bytes) into its textual hexadecimal representation.
	"""
	
	output = []
	
	for o in raw:
		output.append(hex(o)[2:].zfill(2))
	
	return separator.join(output)

def hex_to_raw(text, separator=" "):
	"""
	Converts a hexadecimal representation of a byte array into a bytearray.
	"""
	
	output = []
	
	text = text.replace(separator, "")
	
	for i in range(len(text)//2):
		output.append(int(text[2*i:2*i+2], 16))
	
	return bytearray(output)

# ----------------------------------------------------------------