1 from __future__ import division
8 from p2pool.util import math, pack
11 return pack.IntType(256).unpack(hashlib.sha256(hashlib.sha256(data).digest()).digest())
14 return pack.IntType(160).unpack(hashlib.new('ripemd160', hashlib.sha256(data).digest()).digest())
16 class ChecksummedType(pack.Type):
17 def __init__(self, inner):
21 obj, file = self.inner.read(file)
22 data = self.inner.pack(obj)
24 checksum, file = pack.read(file, 4)
25 if checksum != hashlib.sha256(hashlib.sha256(data).digest()).digest()[:4]:
26 raise ValueError('invalid checksum')
30 def write(self, file, item):
31 data = self.inner.pack(item)
32 return (file, data), hashlib.sha256(hashlib.sha256(data).digest()).digest()[:4]
34 class FloatingInteger(object):
35 __slots__ = ['bits', '_target']
38 def from_target_upper_bound(cls, target):
39 n = math.natural_to_string(target)
40 if n and ord(n[0]) >= 128:
42 bits2 = (chr(len(n)) + (n + 3*chr(0))[:3])[::-1]
43 bits = pack.IntType(32).unpack(bits2)
46 def __init__(self, bits, target=None):
49 if target is not None and self.target != target:
50 raise ValueError('target does not match')
56 res = self._target = math.shift_left(self.bits & 0x00ffffff, 8 * ((self.bits >> 24) - 3))
60 return hash(self.bits)
62 def __eq__(self, other):
63 return self.bits == other.bits
65 def __ne__(self, other):
66 return not (self == other)
68 def __cmp__(self, other):
72 return 'FloatingInteger(bits=%s, target=%s)' % (hex(self.bits), hex(self.target))
74 class FloatingIntegerType(pack.Type):
75 _inner = pack.IntType(32)
78 bits, file = self._inner.read(file)
79 return FloatingInteger(bits), file
81 def write(self, file, item):
82 return self._inner.write(file, item.bits)
84 address_type = pack.ComposedType([
85 ('services', pack.IntType(64)),
86 ('address', pack.IPV6AddressType()),
87 ('port', pack.IntType(16, 'big')),
90 tx_type = pack.ComposedType([
91 ('version', pack.IntType(32)),
92 ('tx_ins', pack.ListType(pack.ComposedType([
93 ('previous_output', pack.PossiblyNoneType(dict(hash=0, index=2**32 - 1), pack.ComposedType([
94 ('hash', pack.IntType(256)),
95 ('index', pack.IntType(32)),
97 ('script', pack.VarStrType()),
98 ('sequence', pack.PossiblyNoneType(2**32 - 1, pack.IntType(32))),
100 ('tx_outs', pack.ListType(pack.ComposedType([
101 ('value', pack.IntType(64)),
102 ('script', pack.VarStrType()),
104 ('lock_time', pack.IntType(32)),
107 merkle_branch_type = pack.ListType(pack.IntType(256))
109 merkle_tx_type = pack.ComposedType([
111 ('block_hash', pack.IntType(256)),
112 ('merkle_branch', merkle_branch_type),
113 ('index', pack.IntType(32)),
116 block_header_type = pack.ComposedType([
117 ('version', pack.IntType(32)),
118 ('previous_block', pack.PossiblyNoneType(0, pack.IntType(256))),
119 ('merkle_root', pack.IntType(256)),
120 ('timestamp', pack.IntType(32)),
121 ('bits', FloatingIntegerType()),
122 ('nonce', pack.IntType(32)),
125 block_type = pack.ComposedType([
126 ('header', block_header_type),
127 ('txs', pack.ListType(tx_type)),
132 aux_pow_type = pack.ComposedType([
133 ('merkle_tx', merkle_tx_type),
134 ('merkle_branch', merkle_branch_type),
135 ('index', pack.IntType(32)),
136 ('parent_block_header', block_header_type),
139 aux_pow_coinbase_type = pack.ComposedType([
140 ('merkle_root', pack.IntType(256, 'big')),
141 ('size', pack.IntType(32)),
142 ('nonce', pack.IntType(32)),
145 def make_auxpow_tree(chain_ids):
146 for size in (2**i for i in xrange(31)):
147 if size < len(chain_ids):
150 for chain_id in chain_ids:
151 pos = (1103515245 * chain_id + 1103515245 * 12345 + 12345) % size
157 raise AssertionError()
161 merkle_record_type = pack.ComposedType([
162 ('left', pack.IntType(256)),
163 ('right', pack.IntType(256)),
166 def merkle_hash(hashes):
169 hash_list = list(hashes)
170 while len(hash_list) > 1:
171 hash_list = [hash256(merkle_record_type.pack(dict(left=left, right=left if right is None else right)))
172 for left, right in zip(hash_list[::2], hash_list[1::2] + [None])]
175 def calculate_merkle_branch(hashes, index):
178 hash_list = [(h, i == index, []) for i, h in enumerate(hashes)]
180 while len(hash_list) > 1:
183 hash256(merkle_record_type.pack(dict(left=left, right=right))),
185 (left_l if left_f else right_l) + [dict(side=1, hash=right) if left_f else dict(side=0, hash=left)],
187 for (left, left_f, left_l), (right, right_f, right_l) in
188 zip(hash_list[::2], hash_list[1::2] + [hash_list[::2][-1]])
191 res = [x['hash'] for x in hash_list[0][2]]
193 assert hash_list[0][1]
195 assert check_merkle_branch(hashes[index], index, res) == hash_list[0][0]
196 assert index == sum(k*2**i for i, k in enumerate([1-x['side'] for x in hash_list[0][2]]))
200 def check_merkle_branch(tip_hash, index, merkle_branch):
201 return reduce(lambda c, (i, h): hash256(merkle_record_type.pack(
202 dict(left=h, right=c) if 2**i & index else
203 dict(left=c, right=h)
204 )), enumerate(merkle_branch), tip_hash)
208 def target_to_average_attempts(target):
209 return 2**256//(target + 1)
211 def target_to_difficulty(target):
212 return (0xffff0000 * 2**(256-64) + 1)/(target + 1)
216 def tx_get_sigop_count(tx):
217 return sum(script.get_sigop_count(txin['script']) for txin in tx['tx_ins']) + sum(script.get_sigop_count(txout['script']) for txout in tx['tx_outs'])
221 base58_alphabet = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
223 def base58_encode(bindata):
224 bindata2 = bindata.lstrip(chr(0))
225 return base58_alphabet[0]*(len(bindata) - len(bindata2)) + math.natural_to_string(math.string_to_natural(bindata2), base58_alphabet)
227 def base58_decode(b58data):
228 b58data2 = b58data.lstrip(base58_alphabet[0])
229 return chr(0)*(len(b58data) - len(b58data2)) + math.natural_to_string(math.string_to_natural(b58data2, base58_alphabet))
231 human_address_type = ChecksummedType(pack.ComposedType([
232 ('version', pack.IntType(8)),
233 ('pubkey_hash', pack.IntType(160)),
236 def pubkey_hash_to_address(pubkey_hash, net):
237 return base58_encode(human_address_type.pack(dict(version=net.ADDRESS_VERSION, pubkey_hash=pubkey_hash)))
239 def pubkey_to_address(pubkey, net):
240 return pubkey_hash_to_address(hash160(pubkey), net)
242 def address_to_pubkey_hash(address, net):
243 x = human_address_type.unpack(base58_decode(address))
244 if x['version'] != net.ADDRESS_VERSION:
245 raise ValueError('address not for this net!')
246 return x['pubkey_hash']
250 def pubkey_to_script2(pubkey):
251 assert len(pubkey) <= 75
252 return (chr(len(pubkey)) + pubkey) + '\xac'
254 def pubkey_hash_to_script2(pubkey_hash):
255 return '\x76\xa9' + ('\x14' + pack.IntType(160).pack(pubkey_hash)) + '\x88\xac'
257 def script2_to_address(script2, net):
259 pubkey = script2[1:-1]
260 script2_test = pubkey_to_script2(pubkey)
264 if script2_test == script2:
265 return pubkey_to_address(pubkey, net)
268 pubkey_hash = pack.IntType(160).unpack(script2[3:-2])
269 script2_test2 = pubkey_hash_to_script2(pubkey_hash)
273 if script2_test2 == script2:
274 return pubkey_hash_to_address(pubkey_hash, net)
276 def script2_to_human(script2, net):
278 pubkey = script2[1:-1]
279 script2_test = pubkey_to_script2(pubkey)
283 if script2_test == script2:
284 return 'Pubkey. Address: %s' % (pubkey_to_address(pubkey, net),)
287 pubkey_hash = pack.IntType(160).unpack(script2[3:-2])
288 script2_test2 = pubkey_hash_to_script2(pubkey_hash)
292 if script2_test2 == script2:
293 return 'Address. Address: %s' % (pubkey_hash_to_address(pubkey_hash, net),)
295 return 'Unknown. Script: %s' % (script2.encode('hex'),)