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bitcoin.py: make int_to_hex throw on overflow

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SomberNight 2018-06-16 02:34:27 +02:00
parent 79f4a8bae9
commit 1a8e8bc047
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2 changed files with 29 additions and 3 deletions
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10
lib/bitcoin.py
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@ -50,12 +50,18 @@ def rev_hex(s):
return bh2u(bfh(s)[::-1]) return bh2u(bfh(s)[::-1])
def int_to_hex(i, length=1): def int_to_hex(i: int, length: int=1) -> str:
"""Converts int to little-endian hex string.
`length` is the number of bytes available
"""
if not isinstance(i, int): if not isinstance(i, int):
raise TypeError('{} instead of int'.format(i)) raise TypeError('{} instead of int'.format(i))
range_size = pow(256, length)
if i < -range_size/2 or i >= range_size:
raise OverflowError('cannot convert int {} to hex ({} bytes)'.format(i, length))
if i < 0: if i < 0:
# two's complement # two's complement
i = pow(256, length) + i i = range_size + i
s = hex(i)[2:].rstrip('L') s = hex(i)[2:].rstrip('L')
s = "0"*(2*length - len(s)) + s s = "0"*(2*length - len(s)) + s
return rev_hex(s) return rev_hex(s)

22
lib/tests/test_bitcoin.py
View file

@ -12,7 +12,7 @@ from lib.bitcoin import (
deserialize_privkey, serialize_privkey, is_segwit_address, deserialize_privkey, serialize_privkey, is_segwit_address,
is_b58_address, address_to_scripthash, is_minikey, is_compressed, is_xpub, 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, push_script, add_number_to_script) script_num_to_hex, push_script, add_number_to_script, int_to_hex)
from lib import ecc, crypto, ecc_fast from lib import ecc, crypto, ecc_fast
from lib.ecc import number_to_string, string_to_number from lib.ecc import number_to_string, string_to_number
from lib.transaction import opcodes from lib.transaction import opcodes
@ -227,6 +227,26 @@ class Test_bitcoin(SequentialTestCase):
result = Hash(payload) result = Hash(payload)
self.assertEqual(expected, result) self.assertEqual(expected, result)
def test_int_to_hex(self):
self.assertEqual('00', int_to_hex(0, 1))
self.assertEqual('ff', int_to_hex(-1, 1))
self.assertEqual('00000000', int_to_hex(0, 4))
self.assertEqual('01000000', int_to_hex(1, 4))
self.assertEqual('7f', int_to_hex(127, 1))
self.assertEqual('7f00', int_to_hex(127, 2))
self.assertEqual('80', int_to_hex(128, 1))
self.assertEqual('80', int_to_hex(-128, 1))
self.assertEqual('8000', int_to_hex(128, 2))
self.assertEqual('ff', int_to_hex(255, 1))
self.assertEqual('ff7f', int_to_hex(32767, 2))
self.assertEqual('0080', int_to_hex(-32768, 2))
self.assertEqual('ffff', int_to_hex(65535, 2))
with self.assertRaises(OverflowError): int_to_hex(256, 1)
with self.assertRaises(OverflowError): int_to_hex(-129, 1)
with self.assertRaises(OverflowError): int_to_hex(-257, 1)
with self.assertRaises(OverflowError): int_to_hex(65536, 2)
with self.assertRaises(OverflowError): int_to_hex(-32769, 2)
def test_var_int(self): def test_var_int(self):
for i in range(0xfd): for i in range(0xfd):
self.assertEqual(var_int(i), "{:02x}".format(i) ) self.assertEqual(var_int(i), "{:02x}".format(i) )