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#!/usr/bin/env python2
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# Copyright (c) 2015-2016 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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import hashlib
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import sys
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import os
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from random import SystemRandom
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import base64
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import hmac
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if len(sys.argv) < 2:
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sys.stderr.write('Please include username as an argument.\n')
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sys.exit(0)
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username = sys.argv[1]
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#This uses os.urandom() underneath
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cryptogen = SystemRandom()
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#Create 16 byte hex salt
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salt_sequence = [cryptogen.randrange(256) for i in range(16)]
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hexseq = list(map(hex, salt_sequence))
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salt = "".join([x[2:] for x in hexseq])
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#Create 32 byte b64 password
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password = base64.urlsafe_b64encode(os.urandom(32))
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digestmod = hashlib.sha256
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if sys.version_info.major >= 3:
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password = password.decode('utf-8')
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digestmod = 'SHA256'
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m = hmac.new(bytearray(salt, 'utf-8'), bytearray(password, 'utf-8'), digestmod)
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result = m.hexdigest()
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print("String to be appended to bitcoin.conf:")
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print("rpcauth="+username+":"+salt+"$"+result)
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print("Your password:\n"+password)
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