stellar: Context is used instead of loop

src/apps/stellar/__init__.py

@@ -9,8 +9,8 @@ def dispatch_StellarGetPublicKey(*args, **kwargs):
 
 
 def dispatch_StellarSignTx(*args, **kwargs):
-    from .sign_tx import sign_tx_loop
-    return sign_tx_loop(*args, **kwargs)
+    from .sign_tx import sign_tx
+    return sign_tx(*args, **kwargs)
 
 
 def boot():

src/apps/stellar/helpers.py

@@ -2,39 +2,6 @@ from trezor.crypto import base32
 import ustruct
 
 
-class UiConfirmInit:
-
-    def __init__(self, pubkey: bytes, network: str):
-        self.pubkey = pubkey
-        self.network = network
-
-
-class UiConfirmMemo:
-
-    def __init__(self, memo_type: int, memo_text: str):
-        self.memo_type = memo_type
-        self.memo_text = memo_text
-
-
-class UiConfirmFinal:
-
-    def __init__(self, fee: int, num_operations: int):
-        self.fee = fee
-        self.num_operations = num_operations
-
-
-def confirm_init(pubkey: bytes, network: str):
-    return (yield UiConfirmInit(pubkey, network))
-
-
-def confirm_memo(memo_type: int, memo_text: str):
-    return (yield UiConfirmMemo(memo_type, memo_text))
-
-
-def confirm_final(fee: int, num_operations: int):
-    return (yield UiConfirmFinal(fee, num_operations))
-
-
 def address_from_public_key(pubkey: bytes):
     """Returns the base32-encoded version of public key bytes (G...)"""
 

src/apps/stellar/operations/serialize.py

@@ -0,0 +1,165 @@
+from trezor.messages.StellarAccountMergeOp import StellarAccountMergeOp
+from trezor.messages.StellarAssetType import StellarAssetType
+from trezor.messages.StellarAllowTrustOp import StellarAllowTrustOp
+from trezor.messages.StellarBumpSequenceOp import StellarBumpSequenceOp
+from trezor.messages.StellarChangeTrustOp import StellarChangeTrustOp
+from trezor.messages.StellarCreateAccountOp import StellarCreateAccountOp
+from trezor.messages.StellarCreatePassiveOfferOp import StellarCreatePassiveOfferOp
+from trezor.messages.StellarManageDataOp import StellarManageDataOp
+from trezor.messages.StellarManageOfferOp import StellarManageOfferOp
+from trezor.messages.StellarPathPaymentOp import StellarPathPaymentOp
+from trezor.messages.StellarPaymentOp import StellarPaymentOp
+from trezor.messages.StellarSetOptionsOp import StellarSetOptionsOp
+from apps.stellar.consts import *
+from apps.stellar.writers import *
+
+
+def serialize_account_merge_op(w, msg: StellarAccountMergeOp):
+    write_pubkey(w, msg.destination_account)
+
+
+def serialize_allow_trust_op(w, msg: StellarAllowTrustOp):
+    # trustor account (the account being allowed to access the asset)
+    write_pubkey(w, msg.trusted_account)
+    write_uint32(w, msg.asset_type)
+    _serialize_asset_code(w, msg.asset_type, msg.asset_code)
+
+    write_bool(w, msg.is_authorized)
+
+
+def serialize_bump_sequence_op(w, msg: StellarBumpSequenceOp):
+    write_uint64(w, msg.bump_to)
+
+
+def serialize_change_trust_op(w, msg: StellarChangeTrustOp):
+    _serialize_asset(w, msg.asset)
+    write_uint64(w, msg.limit)
+
+
+def serialize_create_account_op(w, msg: StellarCreateAccountOp):
+    write_pubkey(w, msg.new_account)
+    write_uint64(w, msg.starting_balance)
+
+
+def serialize_create_passive_offer_op(w, msg: StellarCreatePassiveOfferOp):
+    _serialize_asset(w, msg.selling_asset)
+    _serialize_asset(w, msg.buying_asset)
+    write_uint64(w, msg.amount)
+    write_uint32(w, msg.price_n)
+    write_uint32(w, msg.price_d)
+
+
+def serialize_manage_data_op(w, msg: StellarManageDataOp):
+    if len(msg.key) > 64:
+        raise ValueError('Stellar: max length of a key is 64 bytes')
+    write_string(w, msg.key)
+    write_bool(w, bool(msg.value))
+    if msg.value:
+        write_uint32(w, len(msg.value))
+        write_bytes(w, msg.value)
+
+
+def serialize_manage_offer_op(w, msg: StellarManageOfferOp):
+    _serialize_asset(w, msg.selling_asset)
+    _serialize_asset(w, msg.buying_asset)
+    write_uint64(w, msg.amount)  # amount to sell
+    write_uint32(w, msg.price_n)  # numerator
+    write_uint32(w, msg.price_d)  # denominator
+    write_uint64(w, msg.offer_id)
+
+
+def serialize_path_payment_op(w, msg: StellarPathPaymentOp):
+    _serialize_asset(w, msg.send_asset)
+    write_uint64(w, msg.send_max)
+    write_pubkey(w, msg.destination_account)
+
+    _serialize_asset(w, msg.destination_asset)
+    write_uint64(w, msg.destination_amount)
+    write_uint32(w, len(msg.paths))
+    for p in msg.paths:
+        _serialize_asset(w, p)
+
+
+def serialize_payment_op(w, msg: StellarPaymentOp):
+    write_pubkey(w, msg.destination_account)
+    _serialize_asset(w, msg.asset)
+    write_uint64(w, msg.amount)
+
+
+def serialize_set_options_op(w, msg: StellarSetOptionsOp):
+    # inflation destination
+    write_bool(w, bool(msg.inflation_destination_account))
+    if msg.inflation_destination_account:
+        write_pubkey(w, msg.inflation_destination_account)
+
+    # clear flags
+    write_bool(w, bool(msg.clear_flags))
+    if msg.clear_flags:
+        write_uint32(w, msg.clear_flags)
+
+    # set flags
+    write_bool(w, bool(msg.set_flags))
+    if msg.set_flags:
+        write_uint32(w, msg.set_flags)
+
+    # account thresholds
+    write_bool(w, bool(msg.master_weight))
+    if msg.master_weight:
+        write_uint32(w, msg.master_weight)
+
+    write_bool(w, bool(msg.low_threshold))
+    if msg.low_threshold:
+        write_uint32(w, msg.low_threshold)
+
+    write_bool(w, bool(msg.medium_threshold))
+    if msg.medium_threshold:
+        write_uint32(w, msg.medium_threshold)
+
+    write_bool(w, bool(msg.high_threshold))
+    if msg.high_threshold:
+        write_uint32(w, msg.high_threshold)
+
+    # home domain
+    write_bool(w, bool(msg.home_domain))
+    if msg.home_domain:
+        if len(msg.home_domain) > 32:
+            raise ValueError('Stellar: max length of a home domain is 32 bytes')
+        write_string(w, msg.home_domain)
+
+    # signer
+    write_bool(w, bool(msg.signer_type))
+    if msg.signer_type:
+        # signer type
+        write_uint32(w, msg.signer_type)
+        write_bytes(w, msg.signer_key)
+        write_uint32(w, msg.signer_weight)
+
+
+def serialize_account(w, source_account: bytes):
+    if source_account is None:
+        write_bool(w, False)
+        return
+    write_pubkey(w, source_account)
+
+
+def _serialize_asset_code(w, asset_type: int, asset_code: str):
+    code = bytearray(asset_code)
+    if asset_type == ASSET_TYPE_NATIVE:
+        return  # nothing is needed
+    elif asset_type == ASSET_TYPE_ALPHANUM4:
+        # pad with zeros to 4 chars
+        write_bytes(w, code + bytearray([0] * (4 - len(code))))
+    elif asset_type == ASSET_TYPE_ALPHANUM12:
+        # pad with zeros to 12 chars
+        write_bytes(w, code + bytearray([0] * (12 - len(code))))
+    else:
+        raise ValueError('Stellar: invalid asset type')
+
+
+def _serialize_asset(w, asset: StellarAssetType):
+    if asset is None:
+        write_uint32(w, 0)
+        return
+    write_uint32(w, asset.type)
+    _serialize_asset_code(w, asset.type, asset.code)
+    write_pubkey(w, asset.issuer)

src/apps/stellar/sign_tx.py

@@ -1,6 +1,6 @@
 from apps.common import seed
 from apps.stellar.writers import *
-from apps.stellar.operations import serialize_op
+from apps.stellar.operations import operation
 from apps.stellar import layout
 from apps.stellar import consts
 from apps.stellar import helpers
@@ -11,31 +11,8 @@ from trezor.crypto.curve import ed25519
 from trezor.crypto.hashlib import sha256
 from ubinascii import hexlify
 
-STELLAR_CURVE = 'ed25519'
-TX_TYPE = bytearray('\x00\x00\x00\x02')
-
-
-async def sign_tx_loop(ctx, msg: StellarSignTx):
-    signer = sign_tx(msg, msg)
-    res = None
-    while True:
-        req = signer.send(res)
-        if isinstance(req, StellarTxOpRequest):
-            res = await ctx.call(req, *consts.op_wire_types)
-        elif isinstance(req, StellarSignedTx):
-            break
-        elif isinstance(req, helpers.UiConfirmInit):
-            res = await layout.require_confirm_init(ctx, req.pubkey, req.network)
-        elif isinstance(req, helpers.UiConfirmMemo):
-            res = await layout.require_confirm_memo(ctx, req.memo_type, req.memo_text)
-        elif isinstance(req, helpers.UiConfirmFinal):
-            res = await layout.require_confirm_final(ctx, req.fee, req.num_operations)
-        else:
-            raise TypeError('Stellar: Invalid signing instruction')
-    return req
-
-
-async def sign_tx(ctx, msg):
+
+async def sign_tx(ctx, msg: StellarSignTx):
     if msg.num_operations == 0:
         raise ValueError('Stellar: At least one operation is required')
 
@@ -48,16 +25,16 @@ async def sign_tx(ctx, msg):
 
     w = bytearray()
     write_bytes(w, network_passphrase_hash)
-    write_bytes(w, TX_TYPE)
+    write_bytes(w, consts.TX_TYPE)
 
-    node = await seed.derive_node(ctx, msg.address_n, STELLAR_CURVE)
+    node = await seed.derive_node(ctx, msg.address_n, consts.STELLAR_CURVE)
     pubkey = seed.remove_ed25519_public_key_prefix(node.public_key())
     write_pubkey(w, pubkey)
     if msg.source_account != pubkey:
         raise ValueError('Stellar: source account does not match address_n')
 
     # confirm init
-    await helpers.confirm_init(pubkey, msg.network_passphrase)
+    await layout.require_confirm_init(ctx, pubkey, msg.network_passphrase)
 
     write_uint32(w, msg.fee)
     write_uint64(w, msg.sequence_number)
@@ -91,18 +68,18 @@ async def sign_tx(ctx, msg):
         memo_confirm_text = hexlify(msg.memo_hash).decode()
     else:
         raise ValueError('Stellar invalid memo type')
-    await helpers.confirm_memo(msg.memo_type, memo_confirm_text)
+    await layout.require_confirm_memo(ctx, msg.memo_type, memo_confirm_text)
 
     write_uint32(w, msg.num_operations)
     for i in range(msg.num_operations):
-        op = yield StellarTxOpRequest()
-        serialize_op(w, op)
+        op = await ctx.call(StellarTxOpRequest(), *consts.op_wire_types)
+        await operation(ctx, w, op)
 
     # 4 null bytes representing a (currently unused) empty union
     write_uint32(w, 0)
 
-    # confirms
-    await helpers.confirm_final(msg.fee, msg.num_operations)
+    # final confirm
+    await layout.require_confirm_final(ctx, msg.fee, msg.num_operations)
 
     # sign
     # (note that the signature does not include the 4-byte hint since it can be calculated from the public key)
@@ -110,11 +87,7 @@ async def sign_tx(ctx, msg):
     signature = ed25519.sign(node.private_key(), digest)
 
     # Add the public key for verification that the right account was used for signing
-    resp = StellarSignedTx()
-    resp.public_key = pubkey
-    resp.signature = signature
-
-    yield resp
+    return StellarSignedTx(pubkey, signature)
 
 
 def node_derive(root, address_n: list):