99 lines
2.5 KiB
Python
99 lines
2.5 KiB
Python
# Eos - Verifiable elections
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# Copyright © 2017-18 RunasSudo (Yingtong Li)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero 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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#
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# This program 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 Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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try:
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__pragma__ = __pragma__
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is_python = False
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except:
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is_python = True
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def __pragma__(*args):
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pass
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from eos.core.bigint import *
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from eos.core.objects import *
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# Libraries
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# =========
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if is_python:
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__pragma__('skip')
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import base64
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import hashlib
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__pragma__('noskip')
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else:
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# Load jssha-sha256.js
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lib = __pragma__('js', '''
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(function() {{
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{}
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var exports = {{}};
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exports.jsSHA = window.jsSHA;
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return exports;
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}})()''', __include__('eos/core/hashing/jssha-sha256.js'))
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# Implementation
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# ==============
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class SHA256:
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nbits = 256
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def __init__(self):
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if is_python:
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self.impl = hashlib.sha256()
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else:
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# TNYI: This is completely borked
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self.impl = __pragma__('js', '{}', 'new lib.jsSHA("SHA-256", "TEXT")')
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def update_text(self, *values):
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for value in values:
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if is_python:
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self.impl.update(value.encode('utf-8'))
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else:
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self.impl.js_update(value)
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return self
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def update_bigint(self, *values):
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for value in values:
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self.update_text(str(value))
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return self
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def update_obj(self, *values):
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for value in values:
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self.update_text(EosObject.to_json(EosObject.serialise_and_wrap(value, None, SerialiseOptions(for_hash=True))))
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return self
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def update_obj_raw(self, *values):
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for value in values:
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self.update_text(EosObject.to_json(EosObject.serialise_and_wrap(value, None, SerialiseOptions(for_hash=False))))
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return self
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def hash_as_b64(self, short=False):
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if is_python:
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b64 = base64.b64encode(self.impl.digest()).decode('utf-8')
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else:
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b64 = self.impl.getHash('B64')
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if short:
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return b64[:8]
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return b64
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def hash_as_hex(self):
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if is_python:
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return self.impl.hexdigest()
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else:
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return self.impl.getHash('HEX')
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def hash_as_bigint(self):
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return BigInt(self.hash_as_hex(), 16)
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