async def remember_bip39_passphrase():
# Compute current xprv and switch to using that as root secret.
import stash
from main import dis, pa
if not stash.bip39_passphrase:
if not await ux_confirm(
'''You do not have a BIP39 passphrase set right now, so this command does little except forget the seed words. It does not enhance security.'''
):
return
dis.fullscreen('Check...')
with stash.SensitiveValues() as sv:
if sv.mode != 'words':
# not a BIP39 derived secret, so cannot work.
await ux_show_story(
'''The wallet secret was not based on a seed phrase, so we cannot add a BIP39 passphrase at this time.''',
title='Failed')
return
nv = SecretStash.encode(xprv=sv.node)
dis.fullscreen('Saving...')
pa.change(new_secret=nv)
# re-read settings since key is now different
# - also captures xfp, xpub at this point
pa.new_main_secret(nv)
# check and reload secret
pa.reset()
pa.login()
async def remember_bip39_passphrase():
# Compute current xprv and switch to using that as root secret.
import stash
from main import dis, pa
dis.fullscreen('Check...')
with stash.SensitiveValues() as sv:
if sv.mode != 'words':
# not a BIP39 derived secret, so cannot work.
await ux_show_story('''The wallet secret was not based on a seed phrase, so we cannot add a BIP39 passphrase at this time.''', title='Failed')
return
nv = SecretStash.encode(xprv=sv.node)
# Important: won't write new XFP to nvram if pw still set
stash.bip39_passphrase = ''
dis.fullscreen('Saving...')
pa.change(new_secret=nv)
# re-read settings since key is now different
# - also captures xfp, xpub at this point
pa.new_main_secret(nv)
# check and reload secret
pa.reset()
pa.login()
async def initial_pin_setup(*a):
# First time they select a PIN of any type.
from login import LoginUX
lll = LoginUX()
pin = await lll.get_new_pin(
'Choose PIN', '''\
Pick the main wallet's PIN code now. Be more clever, but an example:
123-4567
It has two parts: prefix (123-) and suffix (-4567). \
Each part must between 2 to 6 digits long. Total length \
can be as long as 12 digits.
The prefix part determines the anti-phishing words you will \
see each time you login.
Your new PIN protects access to \
this Coldcard device and is not a factor in the wallet's \
seed words or private keys.
THERE IS ABSOLUTELY NO WAY TO RECOVER A FORGOTTEN PIN! Write it down.
''')
del lll
if pin is None: return
# A new pin is to be set!
from main import pa, dis, settings, loop
dis.fullscreen("Saving...")
try:
assert pa.is_blank()
pa.change(new_pin=pin)
# check it? kinda, but also get object into normal "logged in" state
pa.setup(pin)
ok = pa.login()
assert ok
# must re-read settings after login, because they are encrypted
# with a key derived from the main secret.
settings.set_key()
settings.load()
except Exception as e:
print("Exception: %s" % e)
# Allow USB protocol, now that we are auth'ed
from usb import enable_usb
enable_usb(loop, False)
from menu import MenuSystem
from flow import EmptyWallet
return MenuSystem(EmptyWallet)
def clear_seed():
from main import dis, pa, settings
import utime
dis.fullscreen('Clearing...')
# clear settings associated with this key, since it will be no more
settings.blank()
# save a blank secret (all zeros is a special case, detected by bootloader)
nv = bytes(AE_SECRET_LEN)
pa.change(new_secret=nv)
dis.fullscreen('Reboot...')
utime.sleep(1)
# security: need to reboot to really be sure to clear the secrets from main memory.
from machine import reset
reset()
def set_seed_value(words):
# Save the seed words into secure element, and reboot. BIP39 password
# is not set at this point (empty string)
ok = tcc.bip39.check(' '.join(words))
assert ok, "seed check: %r" % words
# map words to bip39 wordlist indices
data = [tcc.bip39.lookup_word(w) for w in words]
# map to packed binary representation.
val = 0
for v in data:
val <<= 11
val |= v
# remove the checksum part
vlen = (len(words) * 4) // 3
val >>= (len(words) // 3)
# convert to bytes
seed = val.to_bytes(vlen, 'big')
assert len(seed) == vlen
from main import dis, pa, settings
# encode it for our limited secret space
nv = SecretStash.encode(seed_phrase=seed)
dis.fullscreen('Applying...')
pa.change(new_secret=nv)
# re-read settings since key is now different
# - also captures xfp, xpub at this point
pa.new_main_secret(nv)
# check and reload secret
pa.reset()
pa.login()
async def remember_bip39_passphrase():
# Compute current xprv and switch to using that as root secret.
import stash
from main import dis, pa
dis.fullscreen('Check...')
with stash.SensitiveValues() as sv:
nv = SecretStash.encode(xprv=sv.node)
# Important: won't write new XFP to nvram if pw still set
stash.bip39_passphrase = ''
dis.fullscreen('Saving...')
pa.change(new_secret=nv)
# re-read settings since key is now different
# - also captures xfp, xpub at this point
pa.new_main_secret(nv)
# check and reload secret
pa.reset()
pa.login()
async def restore_from_dict(vals):
# Restore from a dict of values. Already JSON decoded.
# Reboot on success, return string on failure
from main import pa, dis, settings
from pincodes import AE_SECRET_LEN
#print("Restoring from: %r" % vals)
# step1: the private key
# - prefer raw_secret over other values
# - TODO: fail back to other values
try:
chain = chains.get_chain(vals.get('chain', 'BTC'))
assert 'raw_secret' in vals
raw = bytearray(AE_SECRET_LEN)
rs = vals.pop('raw_secret')
if len(rs) % 2:
rs += '0'
x = a2b_hex(rs)
raw[0:len(x)] = x
# check we can decode this right (might be different firmare)
opmode, bits, node = stash.SecretStash.decode(raw)
assert node
# verify against xprv value (if we have it)
if 'xprv' in vals:
check_xprv = chain.serialize_private(node)
assert check_xprv == vals['xprv'], 'xprv mismatch'
except Exception as e:
return ('Unable to decode raw_secret and '
'restore the seed value!\n\n\n' + str(e))
ls = None
if ('long_secret' in vals) and version.has_608:
try:
ls = a2b_hex(vals.pop('long_secret'))
except Exception as exc:
sys.print_exception(exc)
# but keep going.
dis.fullscreen("Saving...")
dis.progress_bar_show(.25)
# clear (in-memory) settings and change also nvram key
# - also captures xfp, xpub at this point
pa.change(new_secret=raw)
# force the right chain
pa.new_main_secret(raw, chain) # updates xfp/xpub
# NOTE: don't fail after this point... they can muddle thru w/ just right seed
if ls is not None:
try:
pa.ls_change(ls)
except Exception as exc:
sys.print_exception(exc)
# but keep going
# restore settings from backup file
for idx, k in enumerate(vals):
dis.progress_bar_show(idx / len(vals))
if not k.startswith('setting.'):
continue
if k == 'xfp' or k == 'xpub': continue
settings.set(k[8:], vals[k])
# write out
settings.save()
if version.has_fatram and ('hsm_policy' in vals):
import hsm
hsm.restore_backup(vals['hsm_policy'])
await ux_show_story(
'Everything has been successfully restored. '
'We must now reboot to install the '
'updated settings and/or seed.',
title='Success!')
from machine import reset
reset()
async def pin_changer(_1, _2, item):
# Help them to change pins with appropriate warnings.
# - forcing them to drill-down to get warning about secondary is on purpose
# - the bootloader maybe lying to us about weather we are main vs. duress
# - there is a duress wallet for both main/sec pins, and you need to know main pin for that
# - what may look like just policy here, is in fact enforced by the bootrom code
#
from main import pa, dis
from login import LoginUX
from pincodes import BootloaderError, EPIN_OLD_AUTH_FAIL
mode = item.arg
warn = {
'main':
('Main PIN',
'You will be changing the main PIN used to unlock your Coldcard. '
"It's the one you just used a moment ago to get in here."),
'duress': ('Duress PIN',
'This PIN leads to a bogus wallet. Funds are recoverable '
'from main seed backup, but not as easily.'),
'secondary':
('Second PIN',
'This PIN protects the "secondary" wallet that can be used to '
'segregate funds or other banking purposes. This other wallet is '
'completely independant of the primary.'),
'brickme':
('Brickme PIN',
'Use of this special PIN code at any prompt will destroy the '
'Coldcard completely. It cannot be reused or salvaged, and '
'the secrets it held are destroyed forever.\n\nDO NOT TEST THIS!'),
}
if pa.is_secondary:
# secondary wallet user can only change their own password, and the secondary
# duress pin...
# NOTE: now excluded from menu, but keep
if mode == 'main' or mode == 'brickme':
await needs_primary()
return
if mode == 'duress' and pa.is_secret_blank():
await ux_show_story(
"Please set wallet seed before creating duress wallet.")
return
# are we changing the pin used to login?
is_login_pin = (mode == 'main') or (mode == 'secondary'
and pa.is_secondary)
lll = LoginUX()
lll.offer_second = False
title, msg = warn[mode]
async def incorrect_pin():
await ux_show_story(
'You provided an incorrect value for the existing %s.' % title,
title='Wrong PIN')
return
# standard threats for all PIN's
msg += '''\n\n\
THERE IS ABSOLUTELY NO WAY TO RECOVER A FORGOTTEN PIN! Write it down.
We strongly recommend all PIN codes used be unique between each other.
'''
if not is_login_pin:
msg += '''\nUse 999999-999999 to clear existing PIN.'''
ch = await ux_show_story(msg, title=title)
if ch != 'y': return
args = {}
need_old_pin = True
if is_login_pin:
# Challenge them for old password; certainly had it, because
# we wouldn't be here otherwise.
need_old_pin = True
else:
# There may be no existing PIN, and we need to learn that
if mode == 'secondary':
args['is_secondary'] = True
elif mode == 'duress':
args['is_duress'] = True
elif mode == 'brickme':
args['is_brickme'] = True
old_pin = None
try:
dis.fullscreen("Check...")
pa.change(old_pin=b'', new_pin=b'', **args)
need_old_pin = False
old_pin = '' # converts to bytes below
except BootloaderError as exc:
#print("(not-error) old pin was NOT blank: %s" % exc)
need_old_pin = True
was_blank = not need_old_pin
if need_old_pin:
# We need the existing pin, so prompt for that.
lll.subtitle = 'Old ' + title
old_pin = await lll.prompt_pin()
if old_pin is None:
return await ux_aborted()
args['old_pin'] = old_pin.encode()
# we can verify the main pin right away here. Be nice.
if is_login_pin and args['old_pin'] != pa.pin:
return await incorrect_pin()
while 1:
lll.reset()
lll.subtitle = "New " + title
pin = await lll.get_new_pin(title, allow_clear=True)
if pin is None:
return await ux_aborted()
is_clear = (pin == '999999-999999')
args['new_pin'] = pin.encode() if not is_clear else b''
if args['new_pin'] == pa.pin and not is_login_pin:
await ux_show_story(
"Your new PIN matches the existing PIN used to get here. "
"It would be a bad idea to use it for another purpose.",
title="Try Again")
continue
break
# install it.
dis.fullscreen("Saving...")
try:
pa.change(**args)
except Exception as exc:
code = exc.args[1]
if code == EPIN_OLD_AUTH_FAIL:
# likely: wrong old pin, on anything but main PIN
return await incorrect_pin()
else:
return await ux_show_story("Unexpected low-level error: %s" %
exc.args[0],
title='Error')
# Main pin is changed, and we use it lots, so update pa
# - also to get pa.has_duress_pin() and has_brickme_pin() to be correct, need this
dis.fullscreen("Verify...")
pa.setup(args['new_pin'] if is_login_pin else pa.pin, pa.is_secondary)
if not pa.is_successful():
# typical: do need login, but if we just cleared the main PIN,
# we cannot/need not login again
pa.login()
if mode == 'duress':
# program the duress secret now... it's derived from real wallet
from stash import SensitiveValues, SecretStash, AE_SECRET_LEN
if is_clear:
# clear secret, using the new pin, which is empty string
pa.change(is_duress=True,
new_secret=b'\0' * AE_SECRET_LEN,
old_pin=b'',
new_pin=b'')
else:
with SensitiveValues() as sv:
# derive required key
node = sv.duress_root()
d_secret = SecretStash.encode(xprv=node)
sv.register(d_secret)
# write it out.
pa.change(is_duress=True,
new_secret=d_secret,
old_pin=args['new_pin'])
# load up the simulator w/ indicated encoded secret. could be xprv/words/etc.
import tcc, main
from sim_settings import sim_defaults
import stash, chains
from h import b2a_hex
from main import settings, pa
from stash import SecretStash, SensitiveValues
from utils import xfp2str
settings.current = sim_defaults
settings.overrides.clear()
raw = main.ENCODED_SECRET
pa.change(new_secret=raw)
pa.new_main_secret(raw)
print("New key in effect: %s" % settings.get('xpub', 'MISSING'))
print("Fingerprint: %s" % xfp2str(settings.get('xfp', 0)))
# (c) Copyright 2020 by Coinkite Inc. This file is covered by license found in COPYING-CC.
#
# quickly main wipe seed; don't install anything new
from main import pa, settings, numpad, dis
from pincodes import AE_SECRET_LEN, PA_IS_BLANK
if not pa.is_secret_blank():
# clear settings associated with this key, since it will be no more
settings.blank()
# save a blank secret (all zeros is a special case, detected by bootloader)
dis.fullscreen('Wipe Seed!')
nv = bytes(AE_SECRET_LEN)
pa.change(new_secret=nv)
rv = pa.setup(pa.pin)
pa.login()
assert pa.is_secret_blank()
# reset top menu and go there
from actions import goto_top_menu
goto_top_menu()
numpad.abort_ux()
async def initial_pin_setup(*a):
# First time they select a PIN of any type.
from login import LoginUX
lll = LoginUX()
title = 'Choose PIN'
ch = await ux_show_story('''\
Pick the main wallet's PIN code now. Be more clever, but an example:
123-4567
It has two parts: prefix (123-) and suffix (-4567). \
Each part must between 2 to 6 digits long. Total length \
can be as long as 12 digits.
The prefix part determines the anti-phishing words you will \
see each time you login.
Your new PIN protects access to \
this Coldcard device and is not a factor in the wallet's \
seed words or private keys.
THERE IS ABSOLUTELY NO WAY TO RECOVER A FORGOTTEN PIN! Write it down.
''',
title=title)
if ch != 'y': return
while 1:
ch = await ux_show_story('''\
There is ABSOLUTELY NO WAY to 'reset the PIN' or 'factory reset' the Coldcard if you forget the PIN.
DO NOT FORGET THE PIN CODE.
Press 6 to prove you read to the end of this message.''',
title='WARNING',
escape='6')
if ch == 'x': return
if ch == '6': break
# do the actual picking
pin = await lll.get_new_pin(title)
del lll
if pin is None: return
# A new pin is to be set!
from main import pa, dis, settings, loop
dis.fullscreen("Saving...")
try:
dis.busy_bar(True)
assert pa.is_blank()
pa.change(new_pin=pin)
# check it? kinda, but also get object into normal "logged in" state
pa.setup(pin)
ok = pa.login()
assert ok
# must re-read settings after login, because they are encrypted
# with a key derived from the main secret.
settings.set_key()
settings.load()
except Exception as e:
print("Exception: %s" % e)
finally:
dis.busy_bar(False)
# Allow USB protocol, now that we are auth'ed
from usb import enable_usb
enable_usb(loop, False)
from menu import MenuSystem
from flow import EmptyWallet
return MenuSystem(EmptyWallet)
# (c) Copyright 2020 by Coinkite Inc. This file is covered by license found in COPYING-CC.
#
# load up the simulator w/ indicated test master key
import tcc, main
from sim_settings import sim_defaults
import stash, chains
from h import b2a_hex
from main import settings, pa
from stash import SecretStash, SensitiveValues
from utils import xfp2str
rs = main.RAW_SECRET
print("New raw secret: %s" % b2a_hex(rs))
if 1:
settings.current = sim_defaults
settings.overrides.clear()
settings.set('chain', 'XTN')
pa.change(new_secret=rs)
pa.new_main_secret(rs)
print("New key in effect: %s" % settings.get('xpub', 'MISSING'))
print("Fingerprint: %s" % xfp2str(settings.get('xfp', 0)))