def identify_single_XOR():
# Set up
args = getArgs()
challengeData = getData()[getFilename(__file__)]
if args.input:
challengeData['values'] = args.input
if not args.dictionaryFile:
raise Exception(
'This challenge must be provided a json data file with -d')
# Complete challenge
hexStrings = readFile(challengeData['values'][0])
scoreBoard = [Candidate(0, b'', b'', b'')
] * (args.candidates if args.candidates else 1)
for hexString in hexStrings:
candidate = crackXOR(hexString, args.dictionaryFile, XORType.SINGLE)
for idx, finalist in enumerate(scoreBoard):
if candidate.score > finalist.score:
scoreBoard[idx] = candidate
break
challengeData['stringNumber'] = len(hexStrings)
challengeData['scoreBoard'] = scoreBoard
return challengeData
def decrypt_AES():
# Set up
args = getArgs()
challengeData = getData()[getFilename(__file__)]
if args.input:
challengeData['value'] = args.input[0]
# Complete challenge
cipherBlocks = readFile(challengeData['value'])
bestGuess = PossibleEncryption('', 0)
for block in cipherBlocks:
guess = maybeECB_AES128(block)
if guess and guess.repetition > bestGuess.repetition:
bestGuess = guess
challengeData['guess'] = bestGuess
challengeData['blockNumber'] = len(cipherBlocks)
return challengeData
def decrypt_AES():
# Set up
args = getArgs()
challengeData = getData()[getFilename(__file__)]
if args.input:
challengeData['value'] = args.input[0]
if args.key:
challengeData['key'] = args.key
# Complete challenge
key = challengeData['key']
f = readFile(challengeData['value'])
ciphertext = b642bytes(''.join(f))
secret = ECB_AES128(key, ciphertext, Action.DECRYPT)
challengeData['secret'] = secret
challengeData['bytes'] = len(ciphertext)
return challengeData
def repeating_XOR():
# Set up
args = getArgs()
challengeData = getData()[getFilename(__file__)]
if args.input:
challengeData['value'] = args.input[0]
if not args.dictionaryFile:
raise Exception(
'This challenge must be provided a json data file with -d')
# Complete challenge
f = readFile(challengeData['value'])
hexString = b642hex(''.join(f))
candidate = crackXOR(hexString, args.dictionaryFile, XORType.REPEATING)
challengeData['candidate'] = candidate
challengeData['lines'] = len(f)
return challengeData
def decrypt_CBC_AES128():
# Set up
args = getArgs()
challengeData = getData()[getFilename(__file__)]
if args.input:
challengeData['value'] = args.input[0]
if args.key:
challengeData['key'] = args.key
# Complete challenge
f = ''.join(readFile(challengeData['value']))
b = b642bytes(f)
VI = bytes([0] * 16)
output = CBC_AES128(challengeData['key'], b, VI, Action.DECRYPT)
challengeData['output'] = output
challengeData['bytes'] = len(b)
return challengeData