docs(core): Add references to SLIPs in the code.

core/src/apps/bitcoin/ownership.py

@@ -20,7 +20,9 @@ if False:
     from trezor.messages.TxInputType import EnumTypeInputScriptType
     from apps.common.coininfo import CoinInfo
 
-# This module implements the SLIP-0019 proof of ownership format.
+# This module implements the SLIP-0019 proof of ownership format, see
+# https://github.com/satoshilabs/slips/blob/master/slip-0019.md.
+
 
 _VERSION_MAGIC = b"SL\x00\x19"
 _FLAG_USER_CONFIRMED = 0x01

core/src/apps/cardano/seed.py

@@ -83,7 +83,7 @@ async def get_keychain(ctx: wire.Context) -> Keychain:
         assert secret_bytes is not None
         root = bip32.from_mnemonic_cardano(secret_bytes.decode(), passphrase)
     else:
-        # derive the root node via SLIP-0023
+        # derive the root node via SLIP-0023 https://github.com/satoshilabs/slips/blob/master/slip-0022.md
         seed = await get_seed(ctx)
         root = bip32.from_seed(seed, "ed25519 cardano seed")
 

core/src/apps/common/seed.py

@@ -10,6 +10,11 @@ if False:
 
 
 class Slip21Node:
+    """
+    This class implements the SLIP-0021 hierarchical derivation of symmetric keys, see
+    https://github.com/satoshilabs/slips/blob/master/slip-0021.md.
+    """
+
     def __init__(self, seed: bytes = None, data: bytes = None) -> None:
         assert seed is None or data is None, "Specify exactly one of: seed, data"
         if data is not None:

core/src/apps/misc/cipher_key_value.py

@@ -11,6 +11,9 @@ if False:
     from trezor.messages.CipherKeyValue import CipherKeyValue
     from trezor.wire import Context
 
+# This module implements the SLIP-0011 symmetric encryption of key-value pairs using a
+# deterministic hierarchy, see https://github.com/satoshilabs/slips/blob/master/slip-0011.md.
+
 
 async def cipher_key_value(ctx: Context, msg: CipherKeyValue) -> CipheredKeyValue:
     keychain = await get_keychain(ctx, "secp256k1", [AlwaysMatchingSchema])

core/src/apps/misc/get_ecdh_session_key.py

@@ -19,6 +19,9 @@ if False:
 
     from apps.common.paths import Bip32Path
 
+# This module implements the SLIP-0017 Elliptic Curve Diffie-Hellman algorithm, using a
+# determinstic hierarchy, see https://github.com/satoshilabs/slips/blob/master/slip-0017.md.
+
 
 async def get_ecdh_session_key(
     ctx: wire.Context, msg: GetECDHSessionKey

core/src/apps/misc/sign_identity.py

@@ -20,6 +20,9 @@ if False:
 
     from apps.common.paths import Bip32Path
 
+# This module implements the SLIP-0013 authentication using a deterministic hierarchy, see
+# https://github.com/satoshilabs/slips/blob/master/slip-0013.md.
+
 
 async def sign_identity(ctx: wire.Context, msg: SignIdentity) -> SignedIdentity:
     if msg.ecdsa_curve_name is None:

core/src/apps/webauthn/credential.py

@@ -103,8 +103,12 @@ class Credential:
             return U2fCredential.from_key_handle(data, rp_id_hash)
 
 
-# SLIP-0022: FIDO2 credential ID format for HD wallets
 class Fido2Credential(Credential):
+    """
+    This class implements the SLIP-0022 FIDO2 Credential ID format for HD wallets, see
+    https://github.com/satoshilabs/slips/blob/master/slip-0022.md.
+    """
+
     def __init__(self) -> None:
         super().__init__()
         self.rp_name: Optional[str] = None