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215 lines
7.7 KiB
215 lines
7.7 KiB
from typing import TYPE_CHECKING
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import storage
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import storage.device
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from trezor import config, wire
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from trezor.crypto import bip39, hashlib, random, slip39
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from trezor.enums import BackupType
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from trezor.messages import EntropyAck, EntropyRequest, Success
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from trezor.ui.layouts import confirm_backup, confirm_reset_device
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from trezor.ui.loader import LoadingAnimation
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from .. import backup_types
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from ..change_pin import request_pin_confirm
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from . import layout
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if __debug__:
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import storage.debug
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if TYPE_CHECKING:
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from trezor.messages import ResetDevice
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_DEFAULT_BACKUP_TYPE = BackupType.Bip39
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async def reset_device(ctx: wire.Context, msg: ResetDevice) -> Success:
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# validate parameters and device state
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_validate_reset_device(msg)
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# make sure user knows they're setting up a new wallet
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if msg.backup_type == BackupType.Slip39_Basic:
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prompt = "Create a new wallet\nwith Shamir Backup?"
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elif msg.backup_type == BackupType.Slip39_Advanced:
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prompt = "Create a new wallet\nwith Super Shamir?"
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else:
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prompt = "Do you want to create\na new wallet?"
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await confirm_reset_device(ctx, prompt)
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await LoadingAnimation()
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# wipe storage to make sure the device is in a clear state
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storage.reset()
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# request and set new PIN
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if msg.pin_protection:
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newpin = await request_pin_confirm(ctx)
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if not config.change_pin("", newpin, None, None):
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raise wire.ProcessError("Failed to set PIN")
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# generate and display internal entropy
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int_entropy = random.bytes(32)
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if __debug__:
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storage.debug.reset_internal_entropy = int_entropy
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if msg.display_random:
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await layout.show_internal_entropy(ctx, int_entropy)
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# request external entropy and compute the master secret
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entropy_ack = await ctx.call(EntropyRequest(), EntropyAck)
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ext_entropy = entropy_ack.entropy
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# For SLIP-39 this is the Encrypted Master Secret
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secret = _compute_secret_from_entropy(int_entropy, ext_entropy, msg.strength)
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# Check backup type, perform type-specific handling
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if msg.backup_type == BackupType.Bip39:
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# in BIP-39 we store mnemonic string instead of the secret
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secret = bip39.from_data(secret).encode()
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elif msg.backup_type in (BackupType.Slip39_Basic, BackupType.Slip39_Advanced):
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# generate and set SLIP39 parameters
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storage.device.set_slip39_identifier(slip39.generate_random_identifier())
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storage.device.set_slip39_iteration_exponent(slip39.DEFAULT_ITERATION_EXPONENT)
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else:
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# Unknown backup type.
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raise RuntimeError
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# If either of skip_backup or no_backup is specified, we are not doing backup now.
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# Otherwise, we try to do it.
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perform_backup = not msg.no_backup and not msg.skip_backup
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# If doing backup, ask the user to confirm.
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if perform_backup:
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perform_backup = await confirm_backup(ctx)
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# generate and display backup information for the master secret
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if perform_backup:
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await backup_seed(ctx, msg.backup_type, secret)
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# write settings and master secret into storage
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if msg.label is not None:
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storage.device.set_label(msg.label)
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storage.device.set_passphrase_enabled(bool(msg.passphrase_protection))
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storage.device.store_mnemonic_secret(
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secret, # for SLIP-39, this is the EMS
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msg.backup_type,
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needs_backup=not perform_backup,
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no_backup=bool(msg.no_backup),
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)
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# if we backed up the wallet, show success message
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if perform_backup:
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await layout.show_backup_success(ctx)
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return Success(message="Initialized")
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async def backup_slip39_basic(
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ctx: wire.Context, encrypted_master_secret: bytes
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) -> None:
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# get number of shares
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await layout.slip39_show_checklist(ctx, 0, BackupType.Slip39_Basic)
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shares_count = await layout.slip39_prompt_number_of_shares(ctx)
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# get threshold
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await layout.slip39_show_checklist(ctx, 1, BackupType.Slip39_Basic)
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threshold = await layout.slip39_prompt_threshold(ctx, shares_count)
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identifier = storage.device.get_slip39_identifier()
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iteration_exponent = storage.device.get_slip39_iteration_exponent()
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if identifier is None or iteration_exponent is None:
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raise ValueError
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# generate the mnemonics
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mnemonics = slip39.split_ems(
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1, # Single Group threshold
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[(threshold, shares_count)], # Single Group threshold/count
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identifier,
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iteration_exponent,
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encrypted_master_secret,
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)[0]
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# show and confirm individual shares
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await layout.slip39_show_checklist(ctx, 2, BackupType.Slip39_Basic)
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await layout.slip39_basic_show_and_confirm_shares(ctx, mnemonics)
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async def backup_slip39_advanced(
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ctx: wire.Context, encrypted_master_secret: bytes
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) -> None:
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# get number of groups
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await layout.slip39_show_checklist(ctx, 0, BackupType.Slip39_Advanced)
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groups_count = await layout.slip39_advanced_prompt_number_of_groups(ctx)
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# get group threshold
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await layout.slip39_show_checklist(ctx, 1, BackupType.Slip39_Advanced)
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group_threshold = await layout.slip39_advanced_prompt_group_threshold(
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ctx, groups_count
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)
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# get shares and thresholds
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await layout.slip39_show_checklist(ctx, 2, BackupType.Slip39_Advanced)
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groups = []
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for i in range(groups_count):
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share_count = await layout.slip39_prompt_number_of_shares(ctx, i)
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share_threshold = await layout.slip39_prompt_threshold(ctx, share_count, i)
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groups.append((share_threshold, share_count))
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identifier = storage.device.get_slip39_identifier()
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iteration_exponent = storage.device.get_slip39_iteration_exponent()
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if identifier is None or iteration_exponent is None:
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raise ValueError
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# generate the mnemonics
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mnemonics = slip39.split_ems(
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group_threshold=group_threshold,
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groups=groups,
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identifier=identifier,
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iteration_exponent=iteration_exponent,
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encrypted_master_secret=encrypted_master_secret,
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)
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# show and confirm individual shares
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await layout.slip39_advanced_show_and_confirm_shares(ctx, mnemonics)
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def _validate_reset_device(msg: ResetDevice) -> None:
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msg.backup_type = msg.backup_type or _DEFAULT_BACKUP_TYPE
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if msg.backup_type not in (
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BackupType.Bip39,
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BackupType.Slip39_Basic,
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BackupType.Slip39_Advanced,
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):
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raise wire.ProcessError("Backup type not implemented.")
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if backup_types.is_slip39_backup_type(msg.backup_type):
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if msg.strength not in (128, 256):
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raise wire.ProcessError("Invalid strength (has to be 128 or 256 bits)")
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else: # BIP-39
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if msg.strength not in (128, 192, 256):
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raise wire.ProcessError("Invalid strength (has to be 128, 192 or 256 bits)")
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if msg.display_random and (msg.skip_backup or msg.no_backup):
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raise wire.ProcessError("Can't show internal entropy when backup is skipped")
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if storage.device.is_initialized():
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raise wire.UnexpectedMessage("Already initialized")
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def _compute_secret_from_entropy(
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int_entropy: bytes, ext_entropy: bytes, strength_in_bytes: int
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) -> bytes:
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# combine internal and external entropy
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ehash = hashlib.sha256()
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ehash.update(int_entropy)
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ehash.update(ext_entropy)
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entropy = ehash.digest()
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# take a required number of bytes
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strength = strength_in_bytes // 8
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secret = entropy[:strength]
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return secret
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async def backup_seed(
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ctx: wire.Context, backup_type: BackupType, mnemonic_secret: bytes
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) -> None:
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if backup_type == BackupType.Slip39_Basic:
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await backup_slip39_basic(ctx, mnemonic_secret)
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elif backup_type == BackupType.Slip39_Advanced:
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await backup_slip39_advanced(ctx, mnemonic_secret)
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else:
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await layout.bip39_show_and_confirm_mnemonic(ctx, mnemonic_secret.decode())
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