An alternative Proof-of-Work (PoW) worker library for Bitmessage, written in Rust. It's part of my learning experience with Rust (see my blog).
Build the dynamic library file libbmpow.so with:
cargo build --release
To use it with the PyBitmessage reference client
Then copy or symlink the resulting target/release/libbmpow.so to the
src/ directory, and update src/proofofwork.py to add an extra function
to call this library, for example something like this:
def _doRustPow(target, initialHash):
from ctypes import cdll, c_ulonglong, c_void_p, create_string_buffer, byref
import os.path
me = os.path.abspath(os.path.dirname(__file__))
lib = cdll.LoadLibrary(os.path.join(me, "libbmpow.so"))
p = create_string_buffer(initialHash, 64)
lib.runpow.argtypes = [c_ulonglong, c_void_p];
lib.runpow.rettype = c_ulonglong;
nonce = lib.runpow(target, byref(p))
trialValue, = unpack('>Q',hashlib.sha512(hashlib.sha512(pack('>Q',nonce) + initialHash).digest()).digest()[0:8])
return [trialValue, nonce]
def run(target, initialHash):
target = int(target)
return _doRustPow(target, initialHash)
The speed of this PoW calculation was tested on a Lenovo X201, very unscientifically.
The Python reference _doFastPow function (multicore) clocks in about 440,000 hash/s.
This library (multicore) clocks in 890,000 - 1,800,000 hash/s (variable), or (single core) about 870,000 hash/s.
Another PoW worker I have, written in OpenCL, clocks in (single core) 1,150,000 hash/s, for reference.
Released under the MIT license
Copyright (c) 2015 Gergely Imreh imrehg@gmail.com
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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