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# -*- coding: utf-8 -*-
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import hashlib
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import secrets
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def rfc2440_hash_password(password, salt=None):
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# Match tor --hash-password
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# secret_to_key_rfc2440
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EXPBIAS = 6
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c = 96
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count = (16 + (c & 15)) << ((c >> 4) + EXPBIAS)
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if salt is None:
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salt = secrets.token_bytes(8)
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assert len(salt) == 8
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hashbytes = salt + password.encode('utf-8')
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len_hashbytes = len(hashbytes)
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h = hashlib.sha1()
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while count > 0:
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if count >= len_hashbytes:
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h.update(hashbytes)
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count -= len_hashbytes
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continue
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h.update(hashbytes[:count])
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break
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rv = '16:' + salt.hex() + '60' + h.hexdigest()
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return rv.upper()
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