cis-kuldeep/PyBitmessage-2021-04-27
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Support for PoW from an external library

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This will attempt to include a PoW library (.so on Unix, .dll on
windows) to do PoW. This is done in a safe way and clean fallback to
normal PoW. The code for the library will be in another commit. The code
is take from https://github.com/bm-robertwhite/bitmessage-powfaster,
with minor modifications.

This patch also includes code to make GPU PoW have a safer fallback.
This commit is contained in:
mailchuck 2015-11-05 20:41:41 +01:00
parent 477b624edd
commit c0351fe42f
Signed by untrusted user who does not match committer: PeterSurda
GPG Key ID: 0C5F50C0B5F37D87
1 changed files with 47 additions and 4 deletions
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49
src/proofofwork.py
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@ -7,7 +7,31 @@ import sys
from shared import config, frozen
import shared
import openclpow
#import os
import os
import ctypes
curdir = os.path.dirname(__file__)
bitmsglib = 'bitmsghash.so'
if "win32" == sys.platform:
if ctypes.sizeof(ctypes.c_voidp) == 4:
bitmsglib = 'bitmsghash32.dll'
else:
bitmsglib = 'bitmsghash64.dll'
try:
bso = ctypes.WinDLL(os.path.join(curdir, bitmsglib))
except:
bso = None
else:
try:
bso = ctypes.CDLL(os.path.join(curdir, bitmsglib))
except:
bso = None
if bso:
try:
bmpow = bso.BitmessagePOW
bmpow.restype = ctypes.c_ulonglong
except:
bmpow = None
def _set_idle():
if 'linux' in sys.platform:
@ -72,12 +96,23 @@ def _doFastPoW(target, initialHash):
pool.join() #Wait for the workers to exit...
return result[0], result[1]
time.sleep(0.2)
def _doCPoW(target, initialHash):
h = initialHash
m = target
out_h = ctypes.pointer(ctypes.create_string_buffer(h, 64))
out_m = ctypes.c_ulonglong(m)
print "C PoW start"
nonce = bmpow(out_h, out_m)
trialValue, = unpack('>Q',hashlib.sha512(hashlib.sha512(pack('>Q',nonce) + initialHash).digest()).digest()[0:8])
print "C PoW done"
return [trialValue, nonce]
def _doGPUPoW(target, initialHash):
print "GPU POW\n"
print "GPU PoW start"
nonce = openclpow.do_opencl_pow(initialHash.encode("hex"), target)
trialValue, = unpack('>Q',hashlib.sha512(hashlib.sha512(pack('>Q',nonce) + initialHash).digest()).digest()[0:8])
#print "{} - value {} < {}".format(nonce, trialValue, target)
print "GPU PoW done"
return [trialValue, nonce]
def run(target, initialHash):
@ -88,8 +123,16 @@ def run(target, initialHash):
# print "GPU: %s, %s" % (trialvalue1, nonce1)
# print "Fast: %s, %s" % (trialvalue, nonce)
# return [trialvalue, nonce]
try:
return _doGPUPoW(target, initialHash)
elif frozen == "macosx_app" or not frozen:
except:
pass # fallback to normal PoW
if frozen == "macosx_app" or not frozen:
if bmpow:
try:
return _doCPoW(target, initialHash)
except:
pass # fallback to normal PoW
return _doFastPoW(target, initialHash)
else:
return _doSafePoW(target, initialHash)