From 3e8f0e903d6a92147d4265854134211b0e48d8ed Mon Sep 17 00:00:00 2001
From: ChekaZ <o.zieglerZ@web.de>
Date: Sun, 16 Dec 2018 21:24:21 +0100
Subject: [PATCH] Trezarcoin Support (#670)

---
 electrumx/lib/coins.py                      | 44 ++++++++++++++++
 electrumx/lib/tx.py                         | 57 +++++++++++++++++++++
 tests/blocks/trezarcoin_mainnet_612581.json | 16 ++++++
 3 files changed, 117 insertions(+)
 create mode 100644 tests/blocks/trezarcoin_mainnet_612581.json

diff --git a/electrumx/lib/coins.py b/electrumx/lib/coins.py
index 0eb7e67..05b5526 100644
--- a/electrumx/lib/coins.py
+++ b/electrumx/lib/coins.py
@@ -1309,6 +1309,50 @@ class Peercoin(Coin):
     REORG_LIMIT = 5000
 
 
+class Trezarcoin(Coin):
+    NAME = "Trezarcoin"
+    SHORTNAME = "TZC"
+    NET = "mainnet"
+    VALUE_PER_COIN = 1000000
+    XPUB_VERBYTES = bytes.fromhex("0488B21E")
+    XPRV_VERBYTES = bytes.fromhex("0488ADE4")
+    P2PKH_VERBYTE = bytes.fromhex("42")
+    P2SH_VERBYTES = [bytes.fromhex("08")]
+    WIF_BYTE = bytes.fromhex("c2")
+    GENESIS_HASH = ('24502ba55d673d2ee9170d83dae2d1ad'
+                    'b3bfb4718e4f200db9951382cc4f6ee6')
+    DESERIALIZER = lib_tx.DeserializerTrezarcoin
+    HEADER_HASH = lib_tx.DeserializerTrezarcoin.blake2s
+    HEADER_HASH_GEN = lib_tx.DeserializerTrezarcoin.blake2s_gen
+    BASIC_HEADER_SIZE = 80
+    TX_COUNT = 742886
+    TX_COUNT_HEIGHT = 643128
+    TX_PER_BLOCK = 2
+    RPC_PORT = 17299
+    REORG_LIMIT = 2000
+    PEERS = [
+        'electrumx1.trezarcoin.com s t',
+    ]
+
+    @classmethod
+    def genesis_block(cls, block):
+        '''Check the Genesis block is the right one for this coin.
+
+        Return the block less its unspendable coinbase.
+        '''
+        header = cls.block_header(block, 0)
+        header_hex_hash = cls.HEADER_HASH_GEN(header)
+        if header_hex_hash != cls.GENESIS_HASH:
+            raise CoinError('genesis block has hash {} expected {}'
+                            .format(header_hex_hash, cls.GENESIS_HASH))
+        return header + bytes(1)
+
+    @classmethod
+    def header_hash(cls, header):
+        '''Given a header return the hash.'''
+        return cls.HEADER_HASH(header)
+
+
 class Reddcoin(Coin):
     NAME = "Reddcoin"
     SHORTNAME = "RDD"
diff --git a/electrumx/lib/tx.py b/electrumx/lib/tx.py
index d4c64a8..dd877d1 100644
--- a/electrumx/lib/tx.py
+++ b/electrumx/lib/tx.py
@@ -28,6 +28,7 @@
 '''Transaction-related classes and functions.'''
 
 from collections import namedtuple
+from hashlib import blake2s
 
 from electrumx.lib.hash import sha256, double_sha256, hash_to_hex_str
 from electrumx.lib.script import OpCodes
@@ -379,6 +380,62 @@ class DeserializerTxTime(Deserializer):
         )
 
 
+class TxTrezarcoin(
+        namedtuple("Tx", "version time inputs outputs locktime txcomment")):
+    '''Class representing transaction that has a time and txcomment field.'''
+
+
+class DeserializerTrezarcoin(Deserializer):
+
+    def read_tx(self):
+        version = self._read_le_int32()
+        time = self._read_le_uint32()
+        inputs = self._read_inputs()
+        outputs = self._read_outputs()
+        locktime = self._read_le_uint32()
+        if version >= 2:
+            txcomment = self._read_varbytes()
+        else:
+            txcomment = b''
+        return TxTrezarcoin(version, time, inputs, outputs, locktime,
+                            txcomment)
+
+    @staticmethod
+    def blake2s_gen(data):
+        version = data[0:1]
+        keyOne = data[36:46]
+        keyTwo = data[58:68]
+        ntime = data[68:72]
+        _nBits = data[72:76]
+        _nonce = data[76:80]
+        _full_merkle = data[36:68]
+        _input112 = data + _full_merkle
+        _key = keyTwo + ntime + _nBits + _nonce + keyOne
+        '''Prepare 112Byte Header '''
+        blake2s_hash = blake2s(key=_key, digest_size=32)
+        blake2s_hash.update(_input112)
+        '''TrezarFlips - Only for Genesis'''
+        return ''.join(map(str.__add__, blake2s_hash.hexdigest()[-2::-2],
+                           blake2s_hash.hexdigest()[-1::-2]))
+
+    @staticmethod
+    def blake2s(data):
+        version = data[0:1]
+        keyOne = data[36:46]
+        keyTwo = data[58:68]
+        ntime = data[68:72]
+        _nBits = data[72:76]
+        _nonce = data[76:80]
+        _full_merkle = data[36:68]
+        _input112 = data + _full_merkle
+        _key = keyTwo + ntime + _nBits + _nonce + keyOne
+        '''Prepare 112Byte Header '''
+        blake2s_hash = blake2s(key=_key, digest_size=32)
+        blake2s_hash.update(_input112)
+        '''TrezarFlips'''
+        return blake2s_hash.digest()
+
+
 class DeserializerReddcoin(Deserializer):
     def read_tx(self):
         version = self._read_le_int32()
diff --git a/tests/blocks/trezarcoin_mainnet_612581.json b/tests/blocks/trezarcoin_mainnet_612581.json
new file mode 100644
index 0000000..e1f3efa
--- /dev/null
+++ b/tests/blocks/trezarcoin_mainnet_612581.json
@@ -0,0 +1,16 @@
+{
+    "hash": "7fccc90aa5997b036d41ec079a2e8e2c52a0d1f64079b59aaa08c25e0e1e1a30",
+    "size": 682,
+    "height": 612581,
+    "merkleroot": "7d9f01b60ab6718e97018b47cd0cf61ca85afe77bcf8d9c90e9709bb2aab9539",
+    "tx": [
+        "758012ea68d57bdc6e413a6d4195638b410df2ed8a3b2387343a854bb3a1c4b6",
+        "c9f6d252f90f42884774d66d8ca17629333cda2871eeb3612307abeebb7e888d",
+        "1354ba387c5f42f807889741a63704fc0ea87dc04f29834111c5f8d80ac0a70b"
+    ],
+    "time": 1541864019,
+    "nonce": 0,
+    "bits": "1c092c62",
+    "previousblockhash": "ac69b095cc53f7a0e9197a243fab2dfa49e7f0934fa79ec68f47993be813b33e",
+    "block": "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"
+}
\ No newline at end of file