app.lisk: Add lisk_get_address and helpers

src/apps/lisk/__init__.py

@@ -0,0 +1,11 @@
+from trezor.wire import register, protobuf_workflow
+from trezor.messages.wire_types import \
+    LiskGetAddress
+
+
+def dispatch_LiskGetAddress(*args, **kwargs):
+    from .get_address import layout_lisk_get_address
+    return layout_lisk_get_address(*args, **kwargs)
+
+def boot():
+    register(LiskGetAddress, protobuf_workflow, dispatch_LiskGetAddress)

src/apps/lisk/get_address.py

@@ -0,0 +1,25 @@
+from apps.wallet.get_address import _show_address, _show_qr
+from .helpers import LISK_CURVE, get_address_from_public_key
+
+
+async def layout_lisk_get_address(ctx, msg):
+    from trezor.messages.LiskAddress import LiskAddress
+    from trezor.crypto.curve import ed25519
+    from ..common import seed
+
+    address_n = msg.address_n or ()
+
+    node = await seed.derive_node(ctx, address_n, LISK_CURVE)
+
+    seckey = node.private_key()
+    public_key = ed25519.publickey(seckey)
+    address = get_address_from_public_key(public_key)
+
+    if msg.show_display:
+        while True:
+            if await _show_address(ctx, address):
+                break
+            if await _show_qr(ctx, address):
+                break
+
+    return LiskAddress(address=address)

src/apps/lisk/helpers.py

@@ -0,0 +1,33 @@
+
+LISK_CURVE = 'ed25519'
+
+def get_address_from_public_key(public_key):
+    from trezor.crypto.hashlib import sha256
+
+    # logic from lisk-js library
+    # https://github.com/LiskHQ/lisk-js/blob/115e0e771e8456dc6c1d4acaabba93d975655cfe/lib/transactions/crypto/convert.js#L30
+    publicKeyHash = list(sha256(public_key).digest())
+    addressData = []
+    for i in range(8):
+        addressData.append(publicKeyHash[7 - i])
+
+    address = int.from_bytes(bytes(addressData), 'big')
+    return str(address) + "L"
+
+def get_votes_count(votes):
+    plus, minus = [], []
+    for vote in votes:
+        plus.append(vote) if vote.startswith('+') else minus.append(vote)
+    return len(plus), len(minus)
+
+def get_vote_tx_text(votes):
+    plus, minus = get_votes_count(votes)
+    text = []
+    if plus > 0:
+        text.append(_text_with_plural('Add', plus))
+    if minus > 0:
+        text.append(_text_with_plural('Remove', minus))
+    return text
+
+def _text_with_plural(txt, value):
+    return '%s %s %s' % (txt, value, ('votes' if value != 1 else 'vote'))

src/main.py

@@ -11,6 +11,7 @@ import apps.homescreen
 import apps.management
 import apps.wallet
 import apps.ethereum
+import apps.lisk
 if __debug__:
     import apps.debug
 else:
@@ -21,6 +22,7 @@ apps.homescreen.boot()
 apps.management.boot()
 apps.wallet.boot()
 apps.ethereum.boot()
+apps.lisk.boot()
 if __debug__:
     apps.debug.boot()
 else: