monero: drop secp256k1 curve

src/apps/monero/__init__.py

@@ -3,12 +3,11 @@ from trezor.messages import MessageType
 
 from apps.common import HARDENED
 
+CURVE = "ed25519"
+
 
 def boot():
-    ns = [
-        ["secp256k1", HARDENED | 44, HARDENED | 128],
-        ["ed25519", HARDENED | 44, HARDENED | 128],
-    ]
+    ns = [[CURVE, HARDENED | 44, HARDENED | 128]]
     wire.add(MessageType.MoneroGetAddress, __name__, "get_address", ns)
     wire.add(MessageType.MoneroGetWatchKey, __name__, "get_watch_only", ns)
     wire.add(MessageType.MoneroTransactionInitRequest, __name__, "sign_tx", ns)

src/apps/monero/misc.py

@@ -1,25 +1,17 @@
 from apps.common import HARDENED
+from apps.monero import CURVE
 
 if False:
     from apps.monero.xmr.types import *
 
 
 def get_creds(keychain, address_n=None, network_type=None):
-    from apps.monero.xmr import crypto, monero
+    from apps.monero.xmr import monero
     from apps.monero.xmr.credentials import AccountCreds
 
-    use_slip0010 = 0 not in address_n  # If path contains 0 it is not SLIP-0010
+    node = keychain.derive(address_n, CURVE)
 
-    if use_slip0010:
-        curve = "ed25519"
-    else:
-        curve = "secp256k1"
-    node = keychain.derive(address_n, curve)
-
-    if use_slip0010:
-        key_seed = node.private_key()
-    else:
-        key_seed = crypto.cn_fast_hash(node.private_key())
+    key_seed = node.private_key()
     spend_sec, _, view_sec, _ = monero.generate_monero_keys(key_seed)
 
     creds = AccountCreds.new_wallet(view_sec, spend_sec, network_type)