1 # Eloipool - Python Bitcoin pool server
2 # Copyright (C) 2011-2012 Luke Dashjr <luke-jr+eloipool@utopios.org>
4 # This program is free software: you can redistribute it and/or modify
5 # it under the terms of the GNU Affero General Public License as
6 # published by the Free Software Foundation, either version 3 of the
7 # License, or (at your option) any later version.
9 # This program is distributed in the hope that it will be useful,
10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 # GNU Affero General Public License for more details.
14 # You should have received a copy of the GNU Affero General Public License
15 # along with this program. If not, see <http://www.gnu.org/licenses/>.
17 from hashlib import sha256
18 from struct import unpack
21 return sha256(sha256(b).digest()).digest()
25 for i in range(0, len(b), 4):
26 o += b[i + 3:i - 1 if i else None:-1]
29 def Bits2Target(bits):
30 return unpack('<L', bits[:3] + b'\0')[0] * 2**(8*(bits[3] - 3))
33 n = unpack('<QQQQ', h)
34 n = (n[3] << 192) | (n[2] << 128) | (n[1] << 64) | n[0]
37 class RejectedShare(ValueError):