add Mintlayer chain type to proto messages

common/protob/messages-mintlayer.proto

@@ -5,17 +5,27 @@ package hw.trezor.messages.mintlayer;
 option java_package = "com.satoshilabs.trezor.lib.protobuf";
 option java_outer_classname = "TrezorMessageMintlayer";
 
+/**
+* Chain Type used to determine the coin name and bech32 prefixes
+*/
+enum MintlayerChainType {
+    Mainnet = 1;
+    Testnet = 2;
+    Regtest = 3;
+    Signet = 4;
+}
+
 /**
  * Request: Ask the device for a Mintlayer address.
  * @start
  * @next MintlayerAddress
  * @next Failure
  */
 message MintlayerGetAddress {
-    repeated uint32 address_n = 1;  // BIP-32-style path to derive the key from master node
-    required string coin_name = 2;  // Coin to use Testnet or Mainnet
-    optional bool show_display = 3; // optionally prompt for confirmation on trezor display
-    optional bool chunkify = 4;     // display the address in chunks of 4 characters
+    repeated uint32 address_n = 1;               // BIP-32-style path to derive the key from master node
+    required MintlayerChainType chain_type = 2;  // Chain type to use
+    optional bool show_display = 3;              // optionally prompt for confirmation on trezor display
+    optional bool chunkify = 4;                  // display the address in chunks of 4 characters
 }
 
 /**
@@ -32,9 +42,9 @@ message MintlayerAddress {
  * @next MintlayerPublicKey
  */
 message MintlayerGetPublicKey {
-    repeated uint32 address_n = 1;  // BIP-32 path to derive the key from master node
-    required string coin_name = 2;  // Coin to use Testnet or Mainnet
-    optional bool show_display = 3; // optionally show on display before sending the result
+    repeated uint32 address_n = 1;               // BIP-32 path to derive the key from master node
+    required MintlayerChainType chain_type = 2;  // Chain type to use
+    optional bool show_display = 3;              // optionally show on display before sending the result
 }
 
 /**
@@ -62,7 +72,7 @@ enum MintlayerAddressType {
  */
 message MintlayerSignMessage {
     repeated uint32 address_n = 1;                     // BIP-32 path to derive the key from master node
-    required string coin_name = 2;                     // Coin to use Testnet or Mainnet
+    required MintlayerChainType chain_type = 2;        // Chain type to use
     required MintlayerAddressType address_type = 3;    // destination address in bech32 encoding
     required bytes message = 4;                        // message to sign
 }
@@ -76,7 +86,7 @@ message MintlayerSignMessage {
 message MintlayerSignTx {
     required uint32 outputs_count = 1;                         // number of transaction outputs
     required uint32 inputs_count = 2;                          // number of transaction inputs
-    required string coin_name = 3;                             // Coin to use Testnet or Mainnet
+    required MintlayerChainType chain_type = 3;                // Chain type to use
     optional uint32 version = 4 [default=1];                   // transaction version
     optional bool serialize = 5 [default=true];                // serialize the full transaction, as opposed to only outputting the signatures
     optional bool chunkify = 6;                                // display the address in chunks of 4 characters

core/src/apps/mintlayer/__init__.py

@@ -1,3 +1,5 @@
+from trezor.enums import MintlayerChainType
+
 from apps.common.coininfo import CoinInfo
 from apps.common.paths import PATTERN_BIP44, PATTERN_BIP44_PUBKEY
 
@@ -109,15 +111,33 @@ def __init__(
     ),
 )
 
+SIGNET_COIN = MLCoinInfo(
+    slip44_id=1,
+    coin_name="signet",
+    coin_shortcut="TML",
+    decimals=11,
+    prefixes=Prefixes(
+        public_key_hash="smt",
+        public_key="spmt",
+        token="smltk",
+        delegation="sdelg",
+        pool="spool",
+        order="sordr",
+    ),
+)
 
-def find_coin_by_name(name: str) -> MLCoinInfo:
-    if name == TESTNET_COIN.coin_name:
-        return TESTNET_COIN
 
-    if name == MAINNET_COIN.coin_name:
+def find_coin_by_chain_type(chain_type: MintlayerChainType) -> MLCoinInfo:
+    if chain_type == MintlayerChainType.Mainnet:
         return MAINNET_COIN
 
-    if name == REGTEST_COIN.coin_name:
+    if chain_type == MintlayerChainType.Testnet:
+        return TESTNET_COIN
+
+    if chain_type == MintlayerChainType.Regtest:
         return REGTEST_COIN
 
-    raise ValueError(f"unknown coin type {name}")
+    if chain_type == MintlayerChainType.Signet:
+        return SIGNET_COIN
+
+    raise ValueError(f"unknown coin type {chain_type}")

core/src/apps/mintlayer/get_address.py

@@ -6,7 +6,7 @@
 from apps.common.keychain import with_slip44_keychain
 
 from ..bitcoin.keychain import validate_path_against_script_type
-from . import CURVE, PATTERNS, SLIP44_ID, find_coin_by_name
+from . import CURVE, PATTERNS, SLIP44_ID, find_coin_by_chain_type
 
 if TYPE_CHECKING:
     from trezor.messages import MintlayerAddress, MintlayerGetAddress
@@ -22,7 +22,7 @@ async def get_address(msg: MintlayerGetAddress, keychain: Keychain) -> Mintlayer
 
     from apps.common import paths
 
-    coin_info = find_coin_by_name(msg.coin_name)
+    coin_info = find_coin_by_chain_type(msg.chain_type)
     address_n = msg.address_n  # local_cache_attribute
 
     await paths.validate_path(

core/src/apps/mintlayer/get_public_key.py

@@ -2,7 +2,7 @@
 
 from apps.common.keychain import with_slip44_keychain
 
-from . import CURVE, PATTERNS, SLIP44_ID, find_coin_by_name
+from . import CURVE, PATTERNS, SLIP44_ID, find_coin_by_chain_type
 
 if TYPE_CHECKING:
     from trezor.messages import MintlayerGetPublicKey, MintlayerPublicKey
@@ -21,7 +21,7 @@ async def get_public_key(
 
     from apps.common import paths
 
-    coin_info = find_coin_by_name(msg.coin_name)
+    coin_info = find_coin_by_chain_type(msg.chain_type)
     await paths.validate_path(
         keychain,
         msg.address_n,

core/src/apps/mintlayer/sign_message.py

@@ -4,7 +4,7 @@
 
 from apps.common.keychain import with_slip44_keychain
 
-from . import CURVE, PATTERNS, SLIP44_ID, find_coin_by_name
+from . import CURVE, PATTERNS, SLIP44_ID, find_coin_by_chain_type
 
 if TYPE_CHECKING:
     from trezor.messages import MessageSignature, MintlayerSignMessage
@@ -25,7 +25,7 @@ async def sign_message(
     from apps.common import paths
     from apps.common.signverify import decode_message
 
-    coin_info = find_coin_by_name(msg.coin_name)
+    coin_info = find_coin_by_chain_type(msg.chain_type)
     message = msg.message
     address_n = msg.address_n
     MESSAGE_MAGIC_PREFIX = b"===MINTLAYER MESSAGE BEGIN===\n"

core/src/apps/mintlayer/sign_tx/signer.py

@@ -16,7 +16,7 @@
 )
 from trezor.wire.errors import DataError
 
-from .. import find_coin_by_name
+from .. import find_coin_by_chain_type
 from . import helpers
 from .helpers import mintlayer_decode
 from .progress import Progress
@@ -180,7 +180,7 @@ def __init__(
         from trezor.messages import MintlayerTxRequest, MintlayerTxRequestDetailsType
 
         self.progress = Progress()
-        self.coininfo = find_coin_by_name(tx.coin_name)
+        self.coininfo = find_coin_by_chain_type(tx.chain_type)
         self.tx_info = TxInfo(tx=tx, inputs=[], outputs=[])
         self.keychain = keychain