mirror of
https://github.com/trezor/trezor-firmware.git
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101 lines
3.3 KiB
Python
101 lines
3.3 KiB
Python
from collections import namedtuple
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from hashlib import sha256
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from ecdsa import SECP256k1, SigningKey
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from trezorlib import btc, messages
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TextMemo = namedtuple("TextMemo", "text")
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RefundMemo = namedtuple("RefundMemo", "address_n")
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CoinPurchaseMemo = namedtuple(
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"CoinPurchaseMemo", "amount, coin_name, slip44, address_n"
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)
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payment_req_signer = SigningKey.from_string(
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b"?S\ti\x8b\xc5o{,\xab\x03\x194\xea\xa8[_:\xeb\xdf\xce\xef\xe50\xf17D\x98`\xb9dj",
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curve=SECP256k1,
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)
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def hash_bytes_prefixed(hasher, data):
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hasher.update(len(data).to_bytes(1, "little"))
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hasher.update(data)
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def make_payment_request(
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client, recipient_name, outputs, change_addresses=None, memos=None, nonce=None
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):
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slip44 = 1 # Testnet
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h_pr = sha256(b"SL\x00\x24")
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if nonce:
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hash_bytes_prefixed(h_pr, nonce)
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else:
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h_pr.update(b"\0")
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hash_bytes_prefixed(h_pr, recipient_name.encode())
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if memos is None:
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memos = []
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h_pr.update(len(memos).to_bytes(1, "little"))
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msg_memos = []
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for memo in memos:
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if isinstance(memo, TextMemo):
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msg_memo = messages.TextMemo(text=memo.text)
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msg_memos.append(messages.PaymentRequestMemo(text_memo=msg_memo))
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memo_type = 1
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h_pr.update(memo_type.to_bytes(4, "little"))
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hash_bytes_prefixed(h_pr, memo.text.encode())
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elif isinstance(memo, RefundMemo):
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address_resp = btc.get_authenticated_address(
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client, "Testnet", memo.address_n
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)
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msg_memo = messages.RefundMemo(
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address=address_resp.address, mac=address_resp.mac
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)
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msg_memos.append(messages.PaymentRequestMemo(refund_memo=msg_memo))
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memo_type = 2
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h_pr.update(memo_type.to_bytes(4, "little"))
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hash_bytes_prefixed(h_pr, address_resp.address.encode())
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elif isinstance(memo, CoinPurchaseMemo):
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address_resp = btc.get_authenticated_address(
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client, memo.coin_name, memo.address_n
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)
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msg_memo = messages.CoinPurchaseMemo(
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coin_type=memo.slip44,
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amount=memo.amount,
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address=address_resp.address,
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mac=address_resp.mac,
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)
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msg_memos.append(messages.PaymentRequestMemo(coin_purchase_memo=msg_memo))
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memo_type = 3
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h_pr.update(memo_type.to_bytes(4, "little"))
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h_pr.update(memo.slip44.to_bytes(4, "little"))
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hash_bytes_prefixed(h_pr, memo.amount.encode())
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hash_bytes_prefixed(h_pr, address_resp.address.encode())
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else:
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raise ValueError
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h_pr.update(slip44.to_bytes(4, "little"))
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change_address = iter(change_addresses or [])
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h_outputs = sha256()
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for txo in outputs:
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h_outputs.update(txo.amount.to_bytes(8, "little"))
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address = txo.address or next(change_address)
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h_outputs.update(len(address).to_bytes(1, "little"))
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h_outputs.update(address.encode())
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h_pr.update(h_outputs.digest())
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return messages.TxAckPaymentRequest(
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recipient_name=recipient_name,
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amount=sum(txo.amount for txo in outputs if txo.address),
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memos=msg_memos,
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nonce=nonce,
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signature=payment_req_signer.sign_digest_deterministic(h_pr.digest()),
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)
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