pull/1091/head
parent
d52de28704
commit
d4317d1536
@ -0,0 +1,92 @@
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from ubinascii import hexlify
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from trezor import ui, wire
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from trezor.messages.GetOwnershipProof import GetOwnershipProof
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from trezor.messages.OwnershipProof import OwnershipProof
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from trezor.ui.text import Text
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from apps.common import coininfo
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from apps.common.confirm import require_confirm
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from apps.common.paths import validate_path
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from . import addresses, common, scripts
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from .keychain import with_keychain
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from .ownership import generate_proof, get_identifier
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if False:
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from apps.common.seed import Keychain
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# Maximum number of characters per line in monospace font.
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_MAX_MONO_LINE = 18
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@with_keychain
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async def get_ownership_proof(
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ctx, msg: GetOwnershipProof, keychain: Keychain, coin: coininfo.CoinInfo
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) -> OwnershipProof:
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await validate_path(
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ctx,
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addresses.validate_full_path,
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keychain,
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msg.address_n,
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coin.curve_name,
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coin=coin,
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script_type=msg.script_type,
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)
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if msg.script_type not in common.INTERNAL_INPUT_SCRIPT_TYPES:
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raise wire.DataError("Invalid script type")
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if msg.script_type in common.SEGWIT_INPUT_SCRIPT_TYPES and not coin.segwit:
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raise wire.DataError("Segwit not enabled on this coin")
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node = keychain.derive(msg.address_n)
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address = addresses.get_address(msg.script_type, coin, node, msg.multisig)
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script_pubkey = scripts.output_derive_script(address, coin)
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ownership_id = get_identifier(script_pubkey, keychain)
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# If the scriptPubKey is multisig, then the caller has to provide
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# ownership IDs, otherwise providing an ID is optional.
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if msg.multisig:
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if ownership_id not in msg.ownership_ids:
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raise wire.DataError("Missing ownership identifier")
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elif msg.ownership_ids:
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if msg.ownership_ids != [ownership_id]:
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raise wire.DataError("Invalid ownership identifier")
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else:
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msg.ownership_ids = [ownership_id]
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# In order to set the "user confirmation" bit in the proof, the user must actually confirm.
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if msg.user_confirmation:
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text = Text("Proof of ownership", ui.ICON_CONFIG)
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text.normal("Do you want to create a")
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if not msg.commitment_data:
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text.normal("proof of ownership?")
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else:
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hex_data = hexlify(msg.commitment_data).decode()
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text.normal("proof of ownership for:")
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if len(hex_data) > 3 * _MAX_MONO_LINE:
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text.mono(hex_data[0:_MAX_MONO_LINE])
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text.mono(
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hex_data[_MAX_MONO_LINE : 3 * _MAX_MONO_LINE // 2 - 1]
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+ "..."
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+ hex_data[-3 * _MAX_MONO_LINE // 2 + 2 : -_MAX_MONO_LINE]
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)
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text.mono(hex_data[-_MAX_MONO_LINE:])
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else:
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text.mono(hex_data)
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await require_confirm(ctx, text)
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ownership_proof, signature = generate_proof(
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node,
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msg.script_type,
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msg.multisig,
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coin,
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msg.user_confirmation,
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msg.ownership_ids,
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script_pubkey,
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msg.commitment_data,
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)
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return OwnershipProof(ownership_proof=ownership_proof, signature=signature)
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@ -0,0 +1,114 @@
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from trezor import utils, wire
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from trezor.crypto import bip32, hashlib, hmac
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from apps.common import seed
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from apps.common.readers import BytearrayReader, read_bitcoin_varint
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from apps.common.writers import (
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empty_bytearray,
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write_bitcoin_varint,
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write_bytes_fixed,
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write_uint8,
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)
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from . import common
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from .scripts import read_bip322_signature_proof, write_bip322_signature_proof
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from .verification import SignatureVerifier
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if False:
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from typing import List, Optional, Tuple
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from trezor.messages.MultisigRedeemScriptType import MultisigRedeemScriptType
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from trezor.messages.TxInputType import EnumTypeInputScriptType
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from apps.common.coininfo import CoinInfo
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# This module implements the SLIP-0019 proof of ownership format.
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_VERSION_MAGIC = b"SL\x00\x19"
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_FLAG_USER_CONFIRMED = 0x01
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_OWNERSHIP_ID_LEN = 32
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_OWNERSHIP_ID_KEY_PATH = [b"SLIP-0019", b"Ownership identification key"]
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def generate_proof(
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node: bip32.HDNode,
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script_type: EnumTypeInputScriptType,
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multisig: MultisigRedeemScriptType,
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coin: CoinInfo,
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user_confirmed: bool,
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ownership_ids: List[bytes],
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script_pubkey: bytes,
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commitment_data: Optional[bytes],
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) -> Tuple[bytes, bytes]:
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flags = 0
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if user_confirmed:
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flags |= _FLAG_USER_CONFIRMED
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proof = empty_bytearray(4 + 1 + 1 + len(ownership_ids) * _OWNERSHIP_ID_LEN)
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write_bytes_fixed(proof, _VERSION_MAGIC, 4)
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write_uint8(proof, flags)
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write_bitcoin_varint(proof, len(ownership_ids))
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for ownership_id in ownership_ids:
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write_bytes_fixed(proof, ownership_id, _OWNERSHIP_ID_LEN)
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sighash = hashlib.sha256(proof)
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sighash.update(script_pubkey)
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if commitment_data:
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sighash.update(commitment_data)
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signature = common.ecdsa_sign(node, sighash.digest())
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public_key = node.public_key()
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write_bip322_signature_proof(
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proof, script_type, multisig, coin, public_key, signature
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)
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return proof, signature
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def verify_nonownership(
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proof: bytes,
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script_pubkey: bytes,
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commitment_data: bytes,
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keychain: seed.Keychain,
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coin: CoinInfo,
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) -> bool:
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try:
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r = BytearrayReader(proof)
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if r.read(4) != _VERSION_MAGIC:
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raise wire.DataError("Unknown format of proof of ownership")
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flags = r.get()
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if flags & 0b1111_1110:
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raise wire.DataError("Unknown flags in proof of ownership")
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# Determine whether our ownership ID appears in the proof.
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id_count = read_bitcoin_varint(r)
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ownership_id = get_identifier(script_pubkey, keychain)
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not_owned = True
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for _ in range(id_count):
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if utils.consteq(ownership_id, r.read(_OWNERSHIP_ID_LEN)):
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not_owned = False
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# Verify the BIP-322 SignatureProof.
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proof_body = proof[: r.offset]
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sighash = hashlib.sha256(proof_body)
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sighash.update(script_pubkey)
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sighash.update(commitment_data)
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script_sig, witness = read_bip322_signature_proof(r)
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# We don't call verifier.ensure_hash_type() to avoid possible compatibility
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# issues between implementations, because the hash type doesn't influence
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# the digest and the value to use is not defined in BIP-322.
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verifier = SignatureVerifier(script_pubkey, script_sig, witness, coin)
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verifier.verify(sighash.digest())
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except (ValueError, IndexError):
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raise wire.DataError("Invalid proof of ownership")
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return not_owned
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def get_identifier(script_pubkey: bytes, keychain: seed.Keychain) -> bytes:
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# k = Key(m/"SLIP-0019"/"Ownership identification key")
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node = keychain.derive(_OWNERSHIP_ID_KEY_PATH)
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# id = HMAC-SHA256(key = k, msg = scriptPubKey)
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return hmac.Hmac(node.key(), script_pubkey, hashlib.sha256).digest()
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