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54 lines
1.5 KiB
Python
54 lines
1.5 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Blockstack
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~~~~~
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copyright: (c) 2014-2015 by Halfmoon Labs, Inc.
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copyright: (c) 2016 by Blockstack.org
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This file is part of Blockstack
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Blockstack is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Blockstack is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Blockstack. If not, see <http://www.gnu.org/licenses/>.
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"""
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import re
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import string
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from binascii import hexlify, unhexlify
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from utilitybelt import charset_to_hex, hex_to_charset
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B16_CHARS = string.hexdigits[:16]
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B40_CHARS = string.digits + string.lowercase + '-_.+'
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B40_REGEX = '^[a-z0-9\-_.+]*$'
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def is_b40(s):
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return isinstance(s, str) and re.match(B40_REGEX, s) is not None
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def b40_to_bin(s):
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if not is_b40(s):
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raise ValueError('{} must only contain characters in the b40 char set'.format(s))
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return unhexlify(charset_to_hex(s, B40_CHARS))
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def bin_to_b40(s):
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if not isinstance(s, str):
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raise ValueError('{} must be a string'.format(s))
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return hex_to_charset(hexlify(s), B40_CHARS)
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def b40_to_hex(s):
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return hexlify(b40_to_bin(s))
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