mirror of
https://github.com/dobin/avred
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80 lines
2.2 KiB
Python
80 lines
2.2 KiB
Python
import logging
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import json
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import os
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import base64
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from model.model import Match, FileInfo, FileType
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from model.testverify import FillType
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def saveMatchesToFile(filename, matches):
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# convert first
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results = []
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for match in matches:
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result = {
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"start": match.begin,
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"end": match.end,
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}
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results.append(result)
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with open(filename, 'w') as outfile:
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json.dump(results, outfile)
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def patchData(data: bytes, base: int, size: int, fillType: FillType=FillType.null) -> bytes:
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fill = None # has to be exactly <size> bytes
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if fillType is FillType.null:
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fill = b"\x00" * size
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elif fillType is FillType.space:
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fill = b" " * size
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elif fillType is FillType.highentropy:
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#fill = random.randbytes(size) # 3.9..
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fill = os.urandom(size)
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elif fillType is FillType.lowentropy:
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#temp = random.randbytes(size) # 3.9..
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temp = os.urandom(size)
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temp = base64.b64encode(temp)
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fill = temp[:size]
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d = bytearray(data)
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d[base:base+size] = fill
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data = bytes(d)
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return data
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def printMatches(data, matches):
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for i in matches:
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size = i.end - i.begin
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dataDump = data[i.begin:i.end]
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print(f"[*] Signature between {i.begin} and {i.end} size {size}: ")
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print(hexdmp(dataDump, offset=i.begin))
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logging.info(f"[*] Signature between {i.begin} and {i.end} size {size}: " + "\n" + hexdmp(dataDump, offset=i.begin))
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def convertMatchesIt(matchesIt):
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matches = []
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idx = 0
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for m in matchesIt:
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match = Match(idx, m.begin, m.end-m.begin)
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matches.append(match)
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idx += 1
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return matches
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MAX_HEXDUMP_SIZE = 2048
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def hexdmp(src, offset=0, length=16):
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if len(src) > 2048:
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return "Match too large ({} > {} max, do not show".format(len(src), MAX_HEXDUMP_SIZE)
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result = []
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digits = 4 if isinstance(src, str) else 2
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for i in range(0, len(src), length):
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s = src[i:i+length]
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hexa = ' '.join(["%0*X" % (digits, x) for x in s])
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text = ''.join([chr(x) if 0x20 <= x < 0x7F else '.' for x in s])
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result.append("%08X %-*s %s" % (i+offset, length*(digits + 1), hexa, text) )
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return('\n'.join(result))
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