Exchange address support

electrum_dash/bitcoin.py

@@ -192,6 +192,8 @@ class opcodes(IntEnum):
 
     OP_INVALIDOPCODE = 0xff
 
+    OP_EXCHANGEADDR = 0xe0
+
     def hex(self) -> str:
         return bytes([self]).hex()
 
@@ -358,15 +360,22 @@ def hash160_to_b58_address(h160: bytes, addrtype: int) -> str:
 def b58_address_to_hash160(addr: str) -> Tuple[int, bytes]:
     addr = to_bytes(addr, 'ascii')
     _bytes = DecodeBase58Check(addr)
-    if len(_bytes) != 21:
+    if len(_bytes) != 21 and len(_bytes) != 23:
         raise Exception(f'expected 21 payload bytes in base58 address. got: {len(_bytes)}')
-    return _bytes[0], _bytes[1:21]
-
+    if len(_bytes) == 21
+        return _bytes[0], _bytes[1:21]
+    elif len(_bytes) == 23
+        return _bytes[0], _bytes[3:23]
+    return None
 
 def hash160_to_p2pkh(h160: bytes, *, net=None) -> str:
     if net is None: net = constants.net
     return hash160_to_b58_address(h160, net.ADDRTYPE_P2PKH)
 
+def hash160_to_exp2pkh(h160: bytes, *, net=None) -> str:
+    if net is None: net = constants.net
+    return hash160_to_b58_address(h160, net.ADDRTYPE_EXP2PKH)
+
 def hash160_to_p2sh(h160: bytes, *, net=None) -> str:
     if net is None: net = constants.net
     return hash160_to_b58_address(h160, net.ADDRTYPE_P2SH)
@@ -375,10 +384,16 @@ def public_key_to_p2pkh(public_key: bytes, *, net=None) -> str:
     if net is None: net = constants.net
     return hash160_to_p2pkh(hash_160(public_key), net=net)
 
+def public_key_to_exp2pkh(public_key: bytes, *, net=None) -> str:
+    if net is None: net = constants.net
+    return hash160_to_exp2pkh(hash_160(public_key), net=net)
+
 def pubkey_to_address(txin_type: str, pubkey: str, *, net=None) -> str:
     if net is None: net = constants.net
     if txin_type == 'p2pkh':
         return public_key_to_p2pkh(bfh(pubkey), net=net)
+    elif txin_type == 'exp2pkh':
+        return public_key_to_exp2pkh(bfh(pubkey), net=net)
     else:
         raise NotImplementedError(txin_type)
 
@@ -405,6 +420,8 @@ def address_to_script(addr: str, *, net=None) -> str:
     addrtype, hash_160_ = b58_address_to_hash160(addr)
     if addrtype == net.ADDRTYPE_P2PKH:
         script = pubkeyhash_to_p2pkh_script(bh2u(hash_160_))
+    elif addrtype == net.ADDRTYPE_EXP2PKH:
+        script = pubkeyhash_to_exp2pkh_script(bh2u(hash_160_))
     elif addrtype == net.ADDRTYPE_P2SH:
         script = construct_script([opcodes.OP_HASH160, hash_160_, opcodes.OP_EQUAL])
     else:
@@ -417,6 +434,7 @@ class OnchainOutputType(Enum):
     In case of p2sh, p2wsh and similar, no knowledge of redeem script, etc.
     """
     P2PKH = enum.auto()
+    EXP2PKH = enum.auto()
     P2SH = enum.auto()
 
 
@@ -428,6 +446,8 @@ def address_to_hash(addr: str, *, net=None) -> Tuple[OnchainOutputType, bytes]:
     addrtype, hash_160_ = b58_address_to_hash160(addr)
     if addrtype == net.ADDRTYPE_P2PKH:
         return OnchainOutputType.P2PKH, hash_160_
+    elif addrtype == net.ADDRTYPE_EXP2PKH:
+        return OnchainOutputType.EXP2PKH, hash_160_
     elif addrtype == net.ADDRTYPE_P2SH:
         return OnchainOutputType.P2SH, hash_160_
     raise BitcoinException(f"unknown address type: {addrtype}")
@@ -454,6 +474,15 @@ def pubkeyhash_to_p2pkh_script(pubkey_hash160: str) -> str:
         opcodes.OP_CHECKSIG
     ])
 
+def pubkeyhash_to_exp2pkh_script(pubkey_hash160: str) -> str:
+    return construct_script([
+        opcodes.OP_EXCHANGEADDR,
+        opcodes.OP_DUP,
+        opcodes.OP_HASH160,
+        pubkey_hash160,
+        opcodes.OP_EQUALVERIFY,
+        opcodes.OP_CHECKSIG
+    ])
 
 __b58chars = b'123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
 assert len(__b58chars) == 58
@@ -641,7 +670,7 @@ def is_b58_address(addr: str, *, net=None) -> bool:
         addrtype, h = b58_address_to_hash160(addr)
     except Exception as e:
         return False
-    if addrtype not in [net.ADDRTYPE_P2PKH, net.ADDRTYPE_P2SH]:
+    if addrtype not in [net.ADDRTYPE_P2PKH, net.ADDRTYPE_P2SH, net.ADDRTYPE_EXP2PKH]:
         return False
     return True
 

electrum_dash/constants.py

@@ -76,6 +76,7 @@ class AbstractNet:
     ADDRTYPE_P2SH: int
     GENESIS: str
     BIP44_COIN_TYPE: int
+    ADDRTYPE_EXP2PKH: int
 
     @classmethod
     def max_checkpoint(cls) -> int:
@@ -92,6 +93,7 @@ class BitcoinMainnet(AbstractNet):
     TESTNET = False
     WIF_PREFIX = 210
     ADDRTYPE_P2PKH = 82  # 0x52
+    ADDRTYPE_EXP2PKH = 185 # 0xb9
     ADDRTYPE_P2SH = 7  # 0x07
     SEGWIT_HRP = "xzc"
     GENESIS = "4381deb85b1b2c9843c222944b616d997516dcbd6a964e1eaf0def0830695233"
@@ -129,6 +131,7 @@ class BitcoinTestnet(AbstractNet):
     TESTNET = True
     WIF_PREFIX = 185
     ADDRTYPE_P2PKH = 65
+    ADDRTYPE_EXP2PKH = 185 # 0xb9
     ADDRTYPE_P2SH = 178
     SEGWIT_HRP = "txzc"
     GENESIS = "aa22adcc12becaf436027ffe62a8fb21b234c58c23865291e5dc52cf53f64fca"
@@ -166,6 +169,7 @@ class BitcoinRegtest(AbstractNet):
     TESTNET = False
     WIF_PREFIX = 239
     ADDRTYPE_P2PKH = 65
+    ADDRTYPE_EXP2PKH = 185 # 0xb9
     ADDRTYPE_P2SH = 178
     SEGWIT_HRP = "txzc" 
     GENESIS = "a42b98f04cc2916e8adfb5d9db8a2227c4629bc205748ed2f33180b636ee885b"

electrum_dash/plugins/ledger/ledger.py

@@ -297,6 +297,7 @@ def perform_hw1_preflight(self):
                 self.dongleObject.verifyPin(pin)
                 if self.canAlternateCoinVersions:
                     self.dongleObject.setAlternateCoinVersions(constants.net.ADDRTYPE_P2PKH,
+                                                               constants.net.ADDRTYPE_EXP2PKH,
                                                                constants.net.ADDRTYPE_P2SH)
         except BTChipException as e:
             if (e.sw == 0x6faa):
@@ -531,7 +532,7 @@ def sign_transaction(self, tx, password):
                     output = txout.address
                     if not self.get_client_electrum().canAlternateCoinVersions:
                         v, h = b58_address_to_hash160(output)
-                        if v == constants.net.ADDRTYPE_P2PKH:
+                        if v == constants.net.ADDRTYPE_P2PKH or v == constants.net.ADDRTYPE_EXP2PKH:
                             output = hash160_to_b58_address(h, 0)
 
         self.handler.show_message(_("Confirm Transaction on your Ledger device..."))

electrum_dash/transaction.py

@@ -44,7 +44,7 @@
 from .bip32 import BIP32Node
 from .util import profiler, to_bytes, bh2u, bfh, chunks, is_hex_str
 from .bitcoin import (TYPE_ADDRESS, TYPE_SCRIPT, hash_160,
-                      hash160_to_p2sh, hash160_to_p2pkh,
+                      hash160_to_p2sh, hash160_to_p2pkh, hash160_to_exp2pkh,
                       var_int, TOTAL_COIN_SUPPLY_LIMIT_IN_BTC, COIN,
                       int_to_hex, push_script, b58_address_to_hash160,
                       opcodes, add_number_to_script, base_decode, base_encode,
@@ -421,6 +421,9 @@ def is_instance(cls, item):
 SCRIPTPUBKEY_TEMPLATE_P2PKH = [opcodes.OP_DUP, opcodes.OP_HASH160,
                                OPPushDataGeneric(lambda x: x == 20),
                                opcodes.OP_EQUALVERIFY, opcodes.OP_CHECKSIG]
+SCRIPTPUBKEY_TEMPLATE_EXP2PKH = [opcodes.OP_EXCHANGEADDR, opcodes.OP_DUP, opcodes.OP_HASH160,
+                               OPPushDataGeneric(lambda x: x == 20),
+                               opcodes.OP_EQUALVERIFY, opcodes.OP_CHECKSIG]
 SCRIPTPUBKEY_TEMPLATE_P2SH = [opcodes.OP_HASH160, OPPushDataGeneric(lambda x: x == 20), opcodes.OP_EQUAL]
 
 
@@ -454,6 +457,8 @@ def get_script_type_from_output_script(_bytes: bytes) -> Optional[str]:
         return None
     if match_script_against_template(decoded, SCRIPTPUBKEY_TEMPLATE_P2PKH):
         return 'p2pkh'
+    if match_script_against_template(decoded, SCRIPTPUBKEY_TEMPLATE_EXP2PKH):
+        return 'exp2pkh'
     if match_script_against_template(decoded, SCRIPTPUBKEY_TEMPLATE_P2SH):
         return 'p2sh'
     return None
@@ -468,6 +473,10 @@ def get_address_from_output_script(_bytes: bytes, *, net=None) -> Optional[str]:
     if match_script_against_template(decoded, SCRIPTPUBKEY_TEMPLATE_P2PKH):
         return hash160_to_p2pkh(decoded[2][1], net=net)
 
+    # exp2pkh
+    if match_script_against_template(decoded, SCRIPTPUBKEY_TEMPLATE_EXP2PKH):
+        return hash160_to_exp2pkh(decoded[2][1], net=net)
+
     # p2sh
     if match_script_against_template(decoded, SCRIPTPUBKEY_TEMPLATE_P2SH):
         return hash160_to_p2sh(decoded[1][1], net=net)
@@ -675,6 +684,8 @@ def guess_txintype_from_address(cls, addr: Optional[str]) -> str:
         addrtype, hash_160_ = b58_address_to_hash160(addr)
         if addrtype == constants.net.ADDRTYPE_P2PKH:
             return 'p2pkh'
+        if addrtype == constants.net.ADDRTYPE_EXP2PKH:
+            return 'exp2pkh'
         elif addrtype == constants.net.ADDRTYPE_P2SH:
             return 'p2sh'
         raise Exception(f'unrecognized address: {repr(addr)}')
@@ -721,6 +732,10 @@ def get_preimage_script(cls, txin: 'PartialTxInput') -> str:
             pubkey = pubkeys[0]
             pkh = bh2u(hash_160(bfh(pubkey)))
             return bitcoin.pubkeyhash_to_p2pkh_script(pkh)
+        elif txin.script_type in ['exp2pkh']:
+            pubkey = pubkeys[0]
+            pkh = bh2u(hash_160(bfh(pubkey)))
+            return bitcoin.pubkeyhash_to_exp2pkh_script(pkh)
         elif txin.script_type == 'p2pk':
             pubkey = pubkeys[0]
             return bitcoin.public_key_to_p2pk_script(pubkey)
@@ -1242,6 +1257,8 @@ def set_script_type(self) -> None:
                 type = inner_type + '-' + type
             if type in ('p2pkh', ):
                 self.script_type = type
+            if type in ('exp2pkh', ):
+                self.script_type = type
         return
 
     def is_complete(self) -> bool:
@@ -1256,7 +1273,7 @@ def is_complete(self) -> bool:
         #       that are related to the wallet.
         #       The 'fix' would be adding extra logic that matches on templates,
         #       and figures out the script_type from available fields.
-        if self.script_type in ('p2pk', 'p2pkh'):
+        if self.script_type in ('p2pk', 'p2pkh', "exp2pkh"):
             return s >= 1
         if self.script_type in ('p2sh', ):
             return s >= self.num_sig