cpp-algorand-sdk/mnemonic.cpp at master · jannotti/cpp-algorand-sdk · GitHub

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#include "mnemonic.h"

#include <iostream>
#include <string>
#include <map>
#include <sstream>
#include <stdexcept>
#include <cassert>

#include <openssl/evp.h>

#include "base.h"

extern std::map<std::string, int> word_map;
extern std::vector<std::string> word_vec;

std::map<std::string, int> make_word_map(std::string s) {
  std::map<std::string, int> map;

  auto iss = std::istringstream{s};
  std::string word;

  int i = 0;
  while (iss >> word) {
    map[word] = i;
    i++;
  }

  return map;
}

std::vector<std::string> make_word_vector(std::string s) {
  std::vector<std::string> vec;

  auto iss = std::istringstream{s};
  std::string word;

  while (iss >> word) {
    vec.push_back(word);
  }

  return vec;
}

int word_lookup(std::string word) {
  auto entry = word_map.find(word);
  if (entry == word_map.end())
    throw std::invalid_argument(word.c_str());
  return entry->second;
}

uint16_t checksum(bytes b) {
  auto hash = sha512_256(b);
  auto ints = b2048_encode(bytes{hash.begin(), hash.begin()+2});
  return ints[0];
}

std::string mnemonic_from_seed(bytes seed) {
  std::string mnemonic;
  for (const int i : b2048_encode(seed)) {
    mnemonic.append(word_vec[i]+" ");
  }
  mnemonic.append(word_vec[checksum(seed)]);
  return mnemonic;
}


bytes seed_from_mnemonic(std::string mnemonic) {
  std::vector<std::string> words = make_word_vector(mnemonic);
  auto checkword = words.back();
  words.pop_back();
  if (words.size() != 24)
    throw std::invalid_argument(std::to_string(words.size()+1) + " words");
  auto checkval = word_lookup(checkword);
  bytes seed;
  // this part is base conversion, 11 to 8. see base.cpp
  unsigned val = 0;
  int bits = 0;
  for (const auto& word : words) {
    val |= word_lookup(word) << bits;
    bits += 11;
    while (bits >= 8) {
      seed.push_back(val & 0xFF);
      val >>= 8;
      bits -= 8;
    }
  }
  if (bits > 0)
    seed.push_back(val & 0xFF);

  assert(!*(seed.end()-1));      // last byte is supposed to be zero
  seed.pop_back();               // and unneeded
  auto check = checksum(seed);
  if (check != checkval) {
    throw std::invalid_argument(word_vec[check] + " != " + word_vec[checkval]);
  }
  return seed;
}

// libsodium/nacl does not implement this truncated form of sha512,
// which is NOT simply the first 256 bits of the sha512 hash.
bytes sha512_256(bytes input) {
  unsigned char result[32];
  EVP_MD_CTX *ctx = EVP_MD_CTX_new();
  bool success = ctx != NULL
      && EVP_DigestInit_ex(ctx, EVP_sha512_256(), NULL) == 1
      && EVP_DigestUpdate(ctx, input.data(), input.size()) == 1
      && EVP_DigestFinal_ex(ctx, result, NULL) == 1;
  if (! success) throw std::runtime_error("openssl sha512_256 EVP_Digest runtime error");
  EVP_MD_CTX_free(ctx);
  return bytes(result, result+sizeof(result));
}

// This wordlist was taken from https://git.io/fhZUO
const std::string english = R"(
abandon
ability
able
about
above
absent
absorb
abstract
absurd
abuse
access
accident
account
accuse
achieve
acid
acoustic
acquire
across
act
action
actor
actress
actual
adapt
add
addict
address
adjust
admit
adult
advance
advice
aerobic
affair
afford
afraid
again
age
agent
agree
ahead
aim
air
airport
aisle
alarm
album
alcohol
alert
alien
all
alley
allow
almost
alone
alpha
already
also
alter
always
amateur
amazing
among
amount
amused
analyst
anchor
ancient
anger
angle
angry
animal
ankle
announce
annual
another
answer
antenna
antique
anxiety
any
apart
apology
appear
apple
approve
april
arch
arctic
area
arena
argue
arm
armed
armor
army
around
arrange
arrest
arrive
arrow
art
artefact
artist
artwork
ask
aspect
assault
asset
assist
assume
asthma
athlete
atom
attack
attend
attitude
attract
auction
audit
august
aunt
author
auto
autumn
average
avocado
avoid
awake
aware
away
awesome
awful
awkward
axis
baby
bachelor
bacon
badge
bag
balance
balcony
ball
bamboo
banana
banner
bar
barely
bargain
barrel
base
basic
basket
battle
beach
bean
beauty
because
become
beef
before
begin
behave
behind
believe
below
belt
bench
benefit
best
betray
better
between
beyond
bicycle
bid
bike
bind
biology
bird
birth
bitter
black
blade
blame
blanket
blast
bleak
bless
blind
blood
blossom
blouse
blue
blur
blush
board
boat
body
boil
bomb
bone
bonus
book
boost
border
boring
borrow
boss
bottom
bounce
box
boy
bracket
brain
brand
brass
brave
bread
breeze
brick
bridge
brief
bright
bring
brisk
broccoli
broken
bronze
broom
brother
brown
brush
bubble
buddy
budget
buffalo
build
bulb
bulk
bullet
bundle
bunker
burden
burger
burst
bus
business
busy
butter
buyer
buzz
cabbage
cabin
cable
cactus
cage
cake
call
calm
camera
camp
can
canal
cancel
candy
cannon
canoe
canvas
canyon
capable
capital
captain
car
carbon
card
cargo
carpet
carry
cart
case
cash
casino
castle
casual
cat
catalog
catch
category
cattle
caught
cause
caution
cave
ceiling
celery
cement
census
century
cereal
certain
chair
chalk
champion
change
chaos
chapter
charge
chase
chat
cheap
check
cheese
chef
cherry
chest
chicken
chief
child
chimney
choice
choose
chronic
chuckle
chunk
churn
cigar
cinnamon
circle
citizen
city
civil
claim
clap
clarify
claw
clay
clean
clerk
clever
click
client
cliff
climb
clinic
clip
clock
clog
close
cloth
cloud
clown
club
clump
cluster
clutch
coach
coast
coconut
code
coffee
coil
coin
collect
color
column
combine
come
comfort
comic
common
company
concert
conduct
confirm
congress
connect
consider
control
convince
cook
cool
copper
copy
coral
core
corn
correct
cost
cotton
couch
country
couple
course
cousin
cover
coyote
crack
cradle
craft
cram
crane
crash
crater
crawl
crazy
cream
credit
creek
crew
cricket
crime
crisp
critic
crop
cross
crouch
crowd
crucial
cruel
cruise
crumble
crunch
crush
cry
crystal
cube
culture
cup
cupboard
curious
current
curtain
curve
cushion
custom
cute
cycle
dad
damage
damp
dance
danger
daring
dash
daughter
dawn
day
deal
debate
debris
decade
december
decide
decline
decorate
decrease
deer
defense
define
defy
degree
delay
deliver
demand
demise
denial
dentist
deny
depart
depend
deposit
depth
deputy
derive
describe
desert
design
desk
despair
destroy
detail
detect
develop
device
devote
diagram
dial
diamond
diary
dice
diesel
diet
differ
digital
dignity
dilemma
dinner
dinosaur
direct
dirt
disagree
discover
disease
dish
dismiss
disorder
display
distance
divert
divide
divorce
dizzy
doctor
document
dog
doll
dolphin
domain
donate
donkey
donor
door
dose
double
dove
draft
dragon
drama
drastic
draw
dream
dress
drift
drill
drink
drip
drive
drop
drum
dry
duck
dumb
dune
during
dust
dutch
duty
dwarf
dynamic
eager
eagle
early
earn
earth
easily
east
easy
echo
ecology
economy
edge
edit
educate
effort
egg
eight
either
elbow
elder
electric
elegant
element
elephant
elevator
elite
else
embark
embody
embrace
emerge
emotion
employ
empower
empty
enable
enact
end
endless
endorse
enemy
energy
enforce
engage
engine
enhance
enjoy
enlist
enough
enrich
enroll
ensure
enter
entire
entry
envelope
episode
equal
equip
era
erase
erode
erosion
error
erupt
escape
essay
essence
estate
eternal
ethics
evidence
evil
evoke
evolve
exact
example
excess
exchange
excite
exclude
excuse
execute
exercise
exhaust
exhibit
exile
exist
exit
exotic
expand
expect
expire
explain
expose
express
extend
extra
eye
eyebrow
fabric
face
faculty
fade
faint
faith
fall
false
fame
family
famous
fan
fancy
fantasy
farm
fashion
fat
fatal
father
fatigue
fault
favorite
feature
february
federal
fee
feed
feel
female
fence
festival
fetch
fever
few
fiber
fiction
field
figure
file
film
filter
final
find
fine
finger
finish
fire
firm
first
fiscal
fish
fit
fitness
fix
flag
flame
flash
flat
flavor
flee
flight
flip
float
flock
floor
flower
fluid
flush
fly
foam
focus
fog
foil
fold
follow
food
foot
force
forest
forget
fork
fortune
forum
forward
fossil
foster
found
fox
fragile
frame
frequent
fresh
friend
fringe
frog
front
frost
frown
frozen
fruit
fuel
fun
funny
furnace
fury
future
gadget
gain
galaxy
gallery
game
gap
garage
garbage
garden
garlic
garment
gas
gasp
gate
gather
gauge
gaze
general
genius
genre
gentle
genuine
gesture
ghost
giant
gift
giggle
ginger
giraffe
girl
give
glad
glance
glare
glass
glide
glimpse
globe
gloom
glory
glove
glow
glue
goat
goddess
gold
good
goose
gorilla
gospel
gossip
govern
gown
grab
grace
grain
grant
grape
grass
gravity
great
green
grid
grief
grit
grocery
group
grow
grunt
guard
guess
guide
guilt
guitar
gun
gym
habit
hair
half
hammer
hamster
hand
happy
harbor
hard
harsh
harvest
hat
have
hawk
hazard
head
health
heart
heavy
hedgehog
height
hello
helmet
help
hen
hero
hidden
high
hill
hint
hip
hire
history
hobby
hockey
hold
hole
holiday
hollow
home
honey
hood
hope
horn
horror
horse
hospital
host
hotel
hour