def analyze(self):
# "RIFF"
#!self.riffTag = util.getBytes(self.data, 0, 4)
# riffSize = dataSize - 8
#!self.riffSize = util.getInt(self.data, 4)
# "WAVE"
#!self.waveTag = util.getBytes(self.data, 8, 4)
# "fmt "
#!self.fmtChunk = util.getBytes(self.data, 12, 4)
# size of the format section
self.fmtChunkSize = util.getInt(self.data, 16)
# "data"
#!self.dataChunk = util.getBytes(self.data, 20+self.fmtChunkSize, 4)
# size of the data section
self.dataChunkSize = util.getInt(self.data, 24 + self.fmtChunkSize)
# "LIST"
#!self.listTag = util.getBytes(self.data, 28+self.fmtChunkSize+self.dataChunkSize, 4)
# size of list section (includes iname)
#!self.listSize = util.getInt(self.data, 32+self.fmtChunkSize+self.dataChunkSize)
# "INFO"
#!self.infoTag = util.getBytes(self.data, 36+self.fmtChunkSize+self.dataChunkSize, 4)
# "INAM"
#!self.inamTag = util.getBytes(self.data, 40+self.fmtChunkSize+self.dataChunkSize, 4)
# size of iname section
self.inamSize = util.getInt(
self.data, 44 + self.fmtChunkSize + self.dataChunkSize)
# Name of impulse response
self.name = util.getBytes(self.data,
48 + self.fmtChunkSize + self.dataChunkSize,
self.inamSize)
# Remove the trailing null byte when converting to a string
self.nameStr = self.name.decode('utf-8')[:-1]
def analyzeFooter(self):
#
self.name = util.getBytes(self.footer, 0, util.sectionNameSize)
#
for i in range(util.sectionNameSize, self.footerSize, util.intSize):
self.footerValues.append(util.getInt(self.footer, i))
#
self.sectionOffset = self.footerValues[0]
self.compressedSize = self.footerValues[2]
self.compressed = (self.footerValues[4] > 0)
self.uncompressedSize = self.footerValues[5]
def __init__(self, data, footerSectionOffset, footerSectionSize):
## raw data from the footer
self.footer = util.getBytes(data, footerSectionOffset,
footerSectionSize)
self.footerSize = len(self.footer)
self.footerOffset = footerSectionOffset
## parsed data from the footer
self.name = None
self.footerValues = []
# 1st 32-bit (LE) int
self.sectionOffset = None
# 3rd 32-bit (LE) int
self.compressedSize = None
# 5th 32-bit (LE) int
self.compressed = None
# 6th 32-bit (LE) int
self.uncompressedSize = None
self.analyzeFooter()
## raw data from the section
self.rawData = util.getBytes(data, self.sectionOffset,
self.compressedSize)
self.rawDataSize = len(self.rawData)
## parsed data from the section
self.data = None
self.dataSize = None
#
self.ir = None
self.jsonGlobal = None
self.deviceInfo = None
self.description = None
self.setList = None
self.setListName = None
self.decompress()
self.analyze()
#!/usr/bin/env python
from collections import defaultdict
from util import getBytes
for line in open('challenge8.txt'):
line = line.strip()
bytes = getBytes(line)
# print bytes
blocks = defaultdict(int)
for i in range(0, len(bytes), 16):
block = tuple(bytes[i:i+16])
blocks[block] += 1
sortedBlocks = sorted(blocks.iteritems(), key=lambda (block, count): count, reverse=True)
block, count = sortedBlocks[0]
# Duplicate blocks means that plaintext was repeated
if count > 1:
print line
print bytes
for block, count in sortedBlocks:
print count, block
#!/usr/bin/env python
from util import getBytes
from ascii import scoreBytes
maxScore = None
for line in open('challenge4.txt'):
line = line.strip()
bytes = getBytes(line)
for key in range(256):
xored = [byte ^ key for byte in bytes]
score = scoreBytes(xored)
if maxScore < score:
maxScore = score
maxKey = key
maxBytes = xored
print maxScore
print maxKey
print maxBytes
string = ''.join(map(chr, maxBytes))
print string
elif char < 'A':
return 0
elif char <= 'Z':
return 1
elif char < 'a':
return 0
elif char <= 'z':
return 1
elif char <= '~':
return 0
else:
return -1
input = '1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736'
bytes = getBytes(input)
print bytes
maxScore = None
for key in range(256):
xored = [byte ^ key for byte in bytes]
score = scoreBytes(xored)
if maxScore < score:
maxScore = score
maxKey = key
maxBytes = xored
print maxScore
print maxKey
print maxBytes
return 1 elif char < 'A': return 0 elif char <= 'Z': return 1 elif char < 'a': return 0 elif char <= 'z': return 1 elif char <= '~': return 0 else: return -1 input = '1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736' bytes = getBytes(input) print bytes maxScore = None for key in range(256): xored = [byte ^ key for byte in bytes] score = scoreBytes(xored) if maxScore < score: maxScore = score maxKey = key maxBytes = xored print maxScore print maxKey print maxBytes
