mirror of
https://github.com/OALabs/hashdb
synced 2026-06-08 12:05:11 +00:00
peter Gurney
33 lines
1.2 KiB
Python
33 lines
1.2 KiB
Python
DESCRIPTION = 'API Hashing as used by d0nut'
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TYPE = 'unsigned_int'
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TEST_1 = 2349756695
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rol = lambda val, r_bits, max_bits: \
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(val << r_bits % max_bits) & (2 ** max_bits-1) | \
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((val & (2 ** max_bits-1)) >> (max_bits-(r_bits % max_bits)))
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def hash(data):
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hashcalc = 75569
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for pointer in range(0, len(data), 4):
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if len(data) - pointer < 4:
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break
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shift_calc = data[pointer+0] | (data[pointer+1] << 8) | (data[pointer+2] << 16) | data[pointer+3] << 24
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hashcalc = (5 * rol(hashcalc ^ (0x27D4EB4F * ((0xE5438000 * shift_calc) | ((0x85EBCA87 * shift_calc & 0xFFFFFFFF) >> 17))), 13, 32))-1640531463 & 0xFFFFFFFF
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else:
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pointer = len(data)
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remainder = len(data) - pointer
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if remainder:
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remainder_bytes = int.from_bytes(data[-remainder:], 'little')
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else:
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remainder_bytes = 0
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rem_or = (0x27D4EB4F * ((0xE5438000 * remainder_bytes & 0xFFFFFFFF) | ((0x85EBCA87 * remainder_bytes & 0xFFFFFFFF) >> 17))) & 0xFFFFFFFF ^ (hashcalc ^ len(data))
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rem_hash = (0x165667C5 * ((0xC2B2AE63 * (rem_or ^ (rem_or >> 16)) & 0xFFFFFFFF) ^ ((0xC2B2AE63 * (rem_or ^ (rem_or >> 16)) & 0xFFFFFFFF) >> 13)) & 0xFFFFFFFF)
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rem_hash = rem_hash ^ (rem_hash >> 16)
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return rem_hash |