mirror of
https://github.com/OALabs/hashdb
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herrcore
54 lines
1.6 KiB
Python
54 lines
1.6 KiB
Python
#!/usr/bin/env python
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########################################################################
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# Copyright 2012 Mandiant
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# Copyright 2014 FireEye
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#
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# Mandiant licenses this file to you under the Apache License, Version
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# 2.0 (the "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at:
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied. See the License for the specific language governing
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# permissions and limitations under the License.
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#
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# Reference:
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# https://github.com/mandiant/flare-ida/blob/master/shellcode_hashes/make_sc_hash_db.py
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#
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########################################################################
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DESCRIPTION = "ROL 7 and ADD"
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TYPE = 'unsigned_int'
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TEST_1 = 2379854656
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ROTATE_BITMASK = {
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8: 0xff,
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16: 0xffff,
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32: 0xffffffff,
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64: 0xffffffffffffffff,
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}
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def rol(inVal, numShifts, dataSize=32):
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'''rotate left instruction emulation'''
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if numShifts == 0:
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return inVal
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if (numShifts < 0) or (numShifts > dataSize):
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raise ValueError('Bad numShifts')
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if (dataSize != 8) and (dataSize != 16) and (dataSize != 32) and (dataSize != 64):
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raise ValueError('Bad dataSize')
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bitMask = ROTATE_BITMASK[dataSize]
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return bitMask & ((inVal << numShifts) | (inVal >> (dataSize-numShifts)))
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def hash(data):
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val = 0
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for i in data:
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val = rol(val, 0x7, 32)
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val += i
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return val
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