sha256(new Buffer(string, 'hex')) in python

Question

Currently I have this code written in nodejs.

const sha256 = require('js-sha256').sha256;
var stringl = "8d12a197cb00d4747a1fe03395095ce2a5cc68198f3470a7388c05ee4e7af3d01d8c722b0ff5237400000000000000000000000000000000000000000000000000000000000000b40000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003600000000000000000000000000000000000000000000000000000000004c4b40000000000000000000000000000000000000000000000000000000000001e240"
console.log(sha256(new Buffer(stringl, 'hex')));

it returns

2c0a99a5727be633e440dd8ce2090a0ab7d5a84ccafc9385ea9812db4d715df1

I want to convert the code from nodejs to python (3.5) .

I thought I could just do it with this code.

import hashlib
string21 = "8d12a197cb00d4747a1fe03395095ce2a5cc68198f3470a7388c05ee4e7af3d01d8c722b0ff5237400000000000000000000000000000000000000000000000000000000000000b40000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003600000000000000000000000000000000000000000000000000000000004c4b40000000000000000000000000000000000000000000000000000000000001e240"
print(hashlib.sha256(str(int(string21,16)).encode('utf-8')).hexdigest())

but that returns

346c61765546d4ff12fdbea997f40bdb5216b8df2b5402a6b45893df723132f6

any ideas?

Hint: Look at what str(int(string21,16)) returns.

tadman
– tadman

2017-10-22 20:03:35 +00:00
Commented Oct 22, 2017 at 20:03 — tadman
– tadman, Commented Oct 22, 2017 at 20:03

ForceBru · Accepted Answer · 2017-10-22 20:04:30Z

2

Buffer returns an array of bytes (integers in range(0, 256)), so you need to do the same thing in Python:

print(hashlib.sha256(bytearray.fromhex(string21)).hexdigest())

bytearray.fromhex does exactly what it says: creates a bytearray from a hexadecimal representation.

EDIT: there's no need to encode anything here as bytearrays already represent bytes.

edited Oct 22, 2017 at 20:04

answered Oct 22, 2017 at 20:01

ForceBru

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1 Comment

user2350155 Over a year ago

Excellent ! Thank you so much!

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