def decrypter_function(args):
# Get the ciphertext from CLI or file
if args.ciphertext is not None:
cipher_txt = args.ciphertext
else: # It's a file
cipher_txt = args.filename.read()
# If specific decoder set (else use all decoders)
if args.decoder is not None:
logging.info('Use specific decoder: ' + args.specific)
decoder = DECODERS_MAP[args.specific]
results = decoder(cipher_txt)
if results == []:
return 'No result found'
result = ''
for i, plaintext in enumerate(results):
result += '[' + str(i + 1) + '] Result: ' + plaintext + '\n\n'
return result
# If specific evaluator set (else use all evaluators)
functions_string = ['F', 'F', 'F']
flag_format = ''
if args.checkLetter or args.checkWord or args.checkFlag:
if args.checkLetter:
functions_string[0] = 'T'
logging.info('Add specific evaluator: letter analysis')
if args.checkWord:
functions_string[1] = 'T'
logging.info('Add specific evaluator: word analysis')
if args.checkFlag:
functions_string[2] = 'T'
logging.info('Add specific evaluator: flag search')
flag_format = args.checkFlag
functions_string = ''.join(functions_string)
else:
logging.info('Use all evaluators')
functions_string = 'TTT'
# Try all decoders
plaintexts = []
logging.info('Decode ciphertext by Caesar decoder')
plaintexts += CaesarDecoder.safe_decode(cipher_txt)
logging.info('Decode ciphertext by ASCII decoder')
plaintexts += ASCIIDecoder.safe_decode(cipher_txt)
logging.info('Decode ciphertext by Base64 decoder')
plaintexts += Base64Decoder.safe_decode(cipher_txt)
logging.info('Decode ciphertext by Reverse decoder')
plaintexts += ReverseDecoder.safe_decode(cipher_txt)
logging.info('Decode ciphertext by hash decoder')
plaintexts += HashDecoder.safe_decode(cipher_txt)
# Create result string
result = ''
evaluatedPlaintexts = evaluate(plaintexts, functions_string,
flag_format)[0:args.number]
for i, plaintext in enumerate(evaluatedPlaintexts):
result += '[' + str(i + 1) + '] Result: ' + plaintext[0] + '\n\n'
return result
def test_validate_false_not_printable_value():
assert (ASCIIDecoder.validate('1 104 105 115 32 105 115 32 97 32 84 101 115 116 33') == False)
def test_validate_true():
assert (ASCIIDecoder.validate('84 104 105 115 32 105 115 32 97 32 84 101 115 116 33') == True)
def test_safe_decode_not_numbers():
assert (ASCIIDecoder.safe_decode('1 2sad 1!5 115 32 1$5 115 32 97 32 84 101 115 116 33') == [])
def test_safe_decode_not_printable_ascii():
assert (ASCIIDecoder.safe_decode('1 104 105 115 32 105 115 32 97 32 84 101 115 116 33') == [])
def test_safe_decode_true():
assert (ASCIIDecoder.safe_decode('84 104 105 115 32 105 115 32 97 32 84 101 115 116 33') == ['This is a Test!'])
def test_validate_false():
assert (ASCIIDecoder.validate('84d104s300 115 32 105 115 32 97 32 84 101 115 116 33') == False)