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November 11, 2022 14:44
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Snippets of Python to help out with reversing
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| import operator | |
| def compileTime(data): | |
| from struct import unpack_from as suf | |
| if data[0:2] == b'\x4d\x5a': | |
| peOffset = suf("<H",data,0x3c)[0] | |
| if data[peOffset:peOffset+4] == b'\x50\x45\0\0': | |
| return suf("<L",data,peOffset+8)[0] | |
| return None | |
| def rotateImpl(invalue, numbits, preshift, postshift, maxbits = 32): | |
| mask = 2**maxbits-1 | |
| s1 = preshift((invalue & mask), (numbits%maxbits)) | |
| s2 = postshift(invalue, (maxbits-(numbits%maxbits)))&mask | |
| return (s1 | s2)&mask | |
| def ror(invalue, numbits, maxbits = 32): | |
| return rotateImpl(invalue, numbits, operator.rshift, operator.lshift, maxbits) | |
| def rol(invalue, numbits, maxbits = 32): | |
| return rotateImpl(invalue, numbits, operator.lshift, operator.rshift, maxbits) |
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