timplement script_num_to_hex - electrum - Electrum Bitcoin wallet
HTML git clone https://git.parazyd.org/electrum
DIR Log
DIR Files
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DIR Submodules
---
DIR commit 4b89b1e270e0730d3b7a811f950663439d3864ac
DIR parent 376a815458d7765c3e3b4c22b74552bd4702b163
HTML Author: SomberNight <somber.night@protonmail.com>
Date: Fri, 13 Apr 2018 20:14:54 +0200
implement script_num_to_hex
Diffstat:
M lib/bitcoin.py | 23 +++++++++++++++++++++++
M lib/tests/test_bitcoin.py | 18 +++++++++++++++++-
2 files changed, 40 insertions(+), 1 deletion(-)
---
DIR diff --git a/lib/bitcoin.py b/lib/bitcoin.py
t@@ -152,6 +152,29 @@ def int_to_hex(i, length=1):
s = "0"*(2*length - len(s)) + s
return rev_hex(s)
+def script_num_to_hex(i):
+ """See CScriptNum in Bitcoin Core.
+ Encodes an integer as hex, to be used in script.
+
+ ported from https://github.com/bitcoin/bitcoin/blob/8cbc5c4be4be22aca228074f087a374a7ec38be8/src/script/script.h#L326
+ """
+ if i == 0:
+ return ''
+
+ result = bytearray()
+ neg = i < 0
+ absvalue = abs(i)
+ while absvalue > 0:
+ result.append(absvalue & 0xff)
+ absvalue >>= 8
+
+ if result[-1] & 0x80:
+ result.append(0x80 if neg else 0x00)
+ elif neg:
+ result[-1] |= 0x80
+
+ return bh2u(result)
+
def var_int(i):
# https://en.bitcoin.it/wiki/Protocol_specification#Variable_length_integer
DIR diff --git a/lib/tests/test_bitcoin.py b/lib/tests/test_bitcoin.py
t@@ -11,7 +11,8 @@ from lib.bitcoin import (
var_int, op_push, address_to_script, regenerate_key,
verify_message, deserialize_privkey, serialize_privkey, is_segwit_address,
is_b58_address, address_to_scripthash, is_minikey, is_compressed, is_xpub,
- xpub_type, is_xprv, is_bip32_derivation, seed_type, EncodeBase58Check)
+ xpub_type, is_xprv, is_bip32_derivation, seed_type, EncodeBase58Check,
+ script_num_to_hex)
from lib.util import bfh
from lib import constants
t@@ -150,6 +151,21 @@ class Test_bitcoin(unittest.TestCase):
self.assertEqual(op_push(0x10000), '4e00000100')
self.assertEqual(op_push(0x12345678), '4e78563412')
+ def test_script_num_to_hex(self):
+ # test vectors from https://github.com/btcsuite/btcd/blob/fdc2bc867bda6b351191b5872d2da8270df00d13/txscript/scriptnum.go#L77
+ self.assertEqual(script_num_to_hex(127), '7f')
+ self.assertEqual(script_num_to_hex(-127), 'ff')
+ self.assertEqual(script_num_to_hex(128), '8000')
+ self.assertEqual(script_num_to_hex(-128), '8080')
+ self.assertEqual(script_num_to_hex(129), '8100')
+ self.assertEqual(script_num_to_hex(-129), '8180')
+ self.assertEqual(script_num_to_hex(256), '0001')
+ self.assertEqual(script_num_to_hex(-256), '0081')
+ self.assertEqual(script_num_to_hex(32767), 'ff7f')
+ self.assertEqual(script_num_to_hex(-32767), 'ffff')
+ self.assertEqual(script_num_to_hex(32768), '008000')
+ self.assertEqual(script_num_to_hex(-32768), '008080')
+
def test_address_to_script(self):
# bech32 native segwit
# test vectors from BIP-0173