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-WIP-electrum-btcp
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stuck at equihash validate

This commit is contained in:
nxsofsys 2018-01-14 22:07:05 +03:00
parent c1601fd749
commit 98a80f6e43
3 changed files with 44 additions and 41 deletions
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3
lib/bitcoin.py
View File

@ -287,6 +287,9 @@ def deser_char_vector(f):
r.append(t)
return r
def vector_from_bytes(s):
return [v for v in s]
def deser_uint256(f):
r = 0

40
lib/blockchain.py
View File

@ -28,6 +28,7 @@ from io import BytesIO
from . import util
from . import bitcoin
from .bitcoin import *
import base64
from .equihash import is_gbp_valid
import logging
@ -44,7 +45,7 @@ def serialize_header(res):
r += struct.pack("<I", res.get('timestamp'))
r += struct.pack("<I", res.get('bits'))
r += str_to_hash(res.get('nonce'))
r += ser_char_vector(str_to_hash(res.get('n_solution')))
r += ser_char_vector(base64.b64decode(res.get('n_solution').encode('utf8')))
return r
def deserialize_header(f, height):
@ -56,7 +57,7 @@ def deserialize_header(f, height):
h['timestamp'] = struct.unpack("<I", f.read(4))[0]
h['bits'] = struct.unpack("<I", f.read(4))[0]
h['nonce'] = hash_to_str(f.read(32))
h['n_solution'] = hash_to_str(deser_char_vector(f))
h['n_solution'] = base64.b64encode(bytes(deser_char_vector(f))).decode('utf8')
h['block_height'] = height
return h
@ -175,19 +176,17 @@ class Blockchain(util.PrintError):
except:
break
def verify_header(self, header, prev_header, bits, target, nonce, n_solution):
prev_hash = self.sha256_header(prev_header)
_powhash = self.sha256_header(header)
def verify_header(self, header, prev_header, target):
prev_hash = hash_header(prev_header)
_powhash = sha256_header(header)
if prev_hash != header.get('prev_block_hash'):
raise BaseException("prev hash mismatch: %s vs %s" % (prev_hash, header.get('prev_block_hash')))
if bitcoin.NetworkConstants.TESTNET:
return
bits = self.target_to_bits(target)
if bits != header.get('bits'):
raise BaseException("bits mismatch: %s vs %s" % (bits, header.get('bits')))
if int('0x' + _powhash, 16) > target:
target = self.bits_to_target(header['bits'])
if _powhash > target:
raise BaseException("insufficient proof of work: %s vs target %s" % (int('0x' + _powhash, 16), target))
if not is_gbp_valid(nonce, n_solution):
nonce = uint256_from_bytes(str_to_hash(header.get('nonce')))
n_solution = vector_from_bytes(base64.b64decode(header.get('n_solution').encode('utf8')))
if not is_gbp_valid(serialize_header(header), nonce, n_solution):
raise BaseException("Equihash invalid")
def verify_chunk(self, index, data):
@ -306,14 +305,12 @@ class Blockchain(util.PrintError):
delta = height - self.checkpoint
name = self.path()
if os.path.exists(name):
f = open(name, 'rb')
with open(name, 'rb') as f:
for i in range(delta):
f.seek(bitcoin.BASIC_HEADER_SIZE, 1)
vs = read_vector_size(f)
f.seek(vs, 1)
h = deserialize_header(f, height)
f.close()
return h
def get_hash(self, height):
@ -371,16 +368,19 @@ class Blockchain(util.PrintError):
if height == 0:
return hash_header(header) == bitcoin.NetworkConstants.GENESIS
try:
prev_hash = self.get_hash(height - 1)
prev_header = self.read_header(height - 1)
prev_hash = self.hash_header(prev_header)
except:
return False
if prev_hash != header.get('prev_block_hash'):
return False
nonce, n_solution = headers.get('nonce'), header.get('n_solution')
bits, target = self.get_target(index * 2016 + i, headers)
target = self.get_target(height // 2016 - 1)
try:
self.verify_header(header, prev_header, bits, target, nonce, n_solution)
except:
self.verify_header(header, prev_header, target)
except BaseException as e:
import traceback
traceback.print_exc()
self.print_error('verify_header failed', str(e))
return False
return True

32
lib/equihash.py
View File

@ -51,16 +51,17 @@ def expand_array(inp, out_len, bit_len, byte_pad=0):
def compress_array(inp, out_len, bit_len, byte_pad=0):
assert bit_len >= 8 and word_size >= 7+bit_len
in_width = (bit_len+7)/8 + byte_pad
assert out_len == bit_len*len(inp)/(8*in_width)
in_width = (bit_len+7)//8 + byte_pad
print('----->', out_len, bit_len*len(inp)//(8*in_width))
assert out_len == bit_len*len(inp)//(8*in_width)
out = bytearray(out_len)
bit_len_mask = (1 << bit_len) - 1
# The acc_bits least-significant bits of acc_value represent a bit sequence
# in big-endian order.
acc_bits = 0;
acc_value = 0;
acc_bits = 0
acc_value = 0
j = 0
for i in range(out_len):
@ -94,18 +95,17 @@ def get_indices_from_minimal(minimal, bit_len):
def get_minimal_from_indices(indices, bit_len):
eh_index_size = 4
assert (bit_len+7)/8 <= eh_index_size
assert (bit_len+7)//8 <= eh_index_size
len_indices = len(indices)*eh_index_size
min_len = bit_len*len_indices/(8*eh_index_size)
byte_pad = eh_index_size - (bit_len+7)/8
byte_indices = bytearray(''.join([struct.pack('>I', i) for i in indices]))
min_len = bit_len*len_indices//(8*eh_index_size)
byte_pad = eh_index_size - (bit_len+7)//8
byte_indices = bytearray(b''.join([struct.pack('>I', i) for i in indices]))
return compress_array(byte_indices, min_len, bit_len, byte_pad)
def hash_nonce(digest, nonce):
for i in range(8):
digest.update(struct.pack('<I', nonce >> (32*i)))
digest.update(struct.pack('<I', nonce >> (32*i) & 0xffffffff))
def hash_xi(digest, xi):
digest.update(struct.pack('<I', xi))
@ -311,11 +311,11 @@ def validate_params(n, k):
# a bit different from https://github.com/zcash/zcash/blob/master/qa/rpc-tests/test_framework/mininode.py#L747
# since electrum is a SPV oriented and not a node
def is_gbp_valid(nNonce, nSolution, n=48, k=5):
def is_gbp_valid(header, nNonce, nSolution, n=48, k=5):
# H(I||...
digest = blake2b(digest_size=(512/n)*n/8, person=zcash_person(n, k))
digest.update(super(CBlock, self).serialize()[:108])
digest = blake2b(digest_size=(512//n)*n//8, person=zcash_person(n, k))
digest.update(header[:108])
hash_nonce(digest, nNonce)
if not gbp_validate(nSolution, digest, n, k):
return False
return True
collision_length = n//(k+1)
return gbp_validate(digest, nSolution, n, k)