src: move HashWriter to trezor.utils

src/apps/common/hash_writer.py

@@ -1,16 +0,0 @@
-
-class HashWriter:
-
-    def __init__(self, hashfunc):
-        self.ctx = hashfunc()
-        self.buf = bytearray(1)  # used in append()
-
-    def extend(self, buf: bytearray):
-        self.ctx.update(buf)
-
-    def append(self, b: int):
-        self.buf[0] = b
-        self.ctx.update(self.buf)
-
-    def get_digest(self, *args) -> bytes:
-        return self.ctx.digest(*args)

src/apps/common/signverify.py

@@ -2,8 +2,7 @@ from ubinascii import hexlify
 from trezor.crypto.hashlib import sha256
 from trezor import ui
 from trezor.ui.text import TEXT_MARGIN_LEFT
-from trezor.utils import chunks, split_words
-from apps.common.hash_writer import HashWriter
+from trezor.utils import chunks, split_words, HashWriter
 from apps.wallet.sign_tx.signing import write_varint
 
 

src/apps/ethereum/sign_message.py

@@ -2,7 +2,7 @@
 def message_digest(message):
     from apps.wallet.sign_tx.signing import write_varint
     from trezor.crypto.hashlib import sha3_256
-    from apps.common.hash_writer import HashWriter
+    from trezor.utils import HashWriter
 
     h = HashWriter(sha3_256)
     signed_message_header = 'Ethereum Signed Message:\n'

src/apps/ethereum/sign_tx.py

@@ -1,7 +1,7 @@
 from trezor.messages.EthereumSignTx import EthereumSignTx
 from trezor.messages.EthereumTxRequest import EthereumTxRequest
 from trezor.messages import FailureType
-from apps.common.hash_writer import HashWriter
+from trezor.utils import HashWriter
 from trezor.crypto import rlp
 from apps.ethereum import tokens, layout
 

src/apps/wallet/sign_tx/multisig.py

@@ -1,12 +1,12 @@
 from trezor.crypto.hashlib import sha256
 from trezor.crypto import bip32
+from trezor.utils import HashWriter
 
 from trezor.messages.MultisigRedeemScriptType import MultisigRedeemScriptType
 from trezor.messages.HDNodePathType import HDNodePathType
 from trezor.messages import FailureType
 
 from apps.wallet.sign_tx.writers import *
-from apps.common.hash_writer import *
 
 
 class MultisigError(ValueError):

src/apps/wallet/sign_tx/segwit_bip143.py

@@ -1,11 +1,11 @@
 from trezor.crypto.hashlib import sha256
 from trezor.messages.SignTx import SignTx
 from trezor.messages import InputScriptType, FailureType
+from trezor.utils import HashWriter
 
 from apps.wallet.sign_tx.writers import *
 from apps.wallet.sign_tx.scripts import output_script_p2pkh, output_script_multisig
 from apps.wallet.sign_tx.multisig import multisig_get_pubkeys
-from apps.common.hash_writer import HashWriter
 
 
 class Bip143Error(ValueError):

src/apps/wallet/sign_tx/signing.py

@@ -3,13 +3,13 @@ from micropython import const
 from trezor.crypto import base58, bip32, der
 from trezor.crypto.curve import secp256k1
 from trezor.crypto.hashlib import sha256
+from trezor.utils import HashWriter
 
 from trezor.messages import OutputScriptType
 from trezor.messages.TxRequestDetailsType import TxRequestDetailsType
 from trezor.messages.TxRequestSerializedType import TxRequestSerializedType
 
 from apps.common import address_type, coins
-from apps.common.hash_writer import HashWriter
 from apps.wallet.sign_tx.addresses import *
 from apps.wallet.sign_tx.helpers import *
 from apps.wallet.sign_tx.scripts import *

src/trezor/utils.py

@@ -59,3 +59,20 @@ def format_amount(amount, decimals):
 
 def format_ordinal(number):
     return str(number) + {1: 'st', 2: 'nd', 3: 'rd'}.get(4 if 10 <= number % 100 < 20 else number % 10, 'th')
+
+
+class HashWriter:
+
+    def __init__(self, hashfunc):
+        self.ctx = hashfunc()
+        self.buf = bytearray(1)  # used in append()
+
+    def extend(self, buf: bytearray):
+        self.ctx.update(buf)
+
+    def append(self, b: int):
+        self.buf[0] = b
+        self.ctx.update(self.buf)
+
+    def get_digest(self, *args) -> bytes:
+        return self.ctx.digest(*args)