def crack_message(poracle, iv, ciphertext):
blocks = [iv]
block_size = len(iv)
for i in range(len(ciphertext) / block_size):
blocks.append(ciphertext[i * block_size:(i + 1) * block_size])
cracked_blocks = []
for i in range(1, len(blocks)):
cracked_blocks.append(crack_block(poracle, blocks[i - 1], blocks[i]))
return pkcs_7_unpad(''.join(cracked_blocks))
def crack_message(poracle, iv, ciphertext):
blocks = [iv]
block_size = len(iv)
for i in range(len(ciphertext) / block_size):
blocks.append(ciphertext[i*block_size:(i+1)*block_size])
cracked_blocks = []
for i in range(1,len(blocks)):
cracked_blocks.append(crack_block(poracle,blocks[i-1],blocks[i]))
return pkcs_7_unpad(''.join(cracked_blocks))
def crack(oracle):
block_length = len_of_cipher_block(oracle)
print 'Block-length : ' + str(block_length)
if (verify_ECB_mode(oracle, block_length)):
print 'ECB mode verified'
#real decryption starts
oracle = rm_random_chrs(oracle, block_length)
msg = ''
for i in range(0, len(oracle(''))):
try:
msg += find_nxt_chr(oracle, block_length, msg)
print msg
except:
pass
return pkcs_7_unpad(msg)
def crack(oracle):
block_size = get_len_of_block_cipher(oracle)
print "[+] Identified block size = " + str(block_size)
if not verify_ECB_mode(oracle, block_size):
print "[-] Not ECB encryption oracle"
return
else:
print "[+] Verified ECB encryption"
complete_message_len = len(oracle(''))
message = ''
for i in range(complete_message_len):
try:
message += pull_next_letter(oracle, block_size, message)
except:
break
return pkcs_7_unpad(message)
def crack(oracle):
block_size = get_len_of_block_cipher(oracle)
print "[+] Identified block size = " + str(block_size)
if not verify_ECB_mode(oracle, block_size):
print "[-] Not ECB encryption oracle"
return
else:
print "[+] Verified ECB encryption"
complete_message_len = len(oracle(''))
message = ''
for i in range(complete_message_len):
try:
message += pull_next_letter(oracle, block_size, message)
except:
break
return pkcs_7_unpad(message)
def crack(data,oracle): no_of_blocks=len(data)/16 blocks=[random_IV] for block_no in range(no_of_blocks): blocks.append(data[block_no*16:(block_no+1)*16]) msg='' for i in range(1,len(blocks)): block_msg='' for j in range(16): try: block_msg=find_nxt_chr(data,blocks[i-1],blocks[i],block_msg,oracle)+block_msg except: pass msg+=block_msg return (msg) if __name__ == '__main__': msg=[] while True: try: if (len(msg)==10): break cracked_msg=pkcs_7_unpad(crack(encryption_oracle(),padding_oracle)) if ( not (cracked_msg in msg)): msg.append(cracked_msg) print cracked_msg except: print 'EX'
#! /usr/bin/env python
from AES_128 import pkcs_7_unpad, PaddingException
cases = [
"ICE ICE BABY\x04\x04\x04\x04", "ICE ICE BABY\x05\x05\x05\x05",
"ICE ICE BABY\x01\x02\x03\x04"
]
for i in range(len(cases)):
try:
print "Case %d passed. String = %s" % (i, repr(pkcs_7_unpad(cases[i])))
except PaddingException:
print "Case %d went wrong. Caught PaddingException." % i
#! /usr/bin/env python
from AES_128 import pkcs_7_unpad, PaddingException
cases = [
"ICE ICE BABY\x04\x04\x04\x04",
"ICE ICE BABY\x05\x05\x05\x05",
"ICE ICE BABY\x01\x02\x03\x04"
]
for i in range(len(cases)):
try:
print "Case %d passed. String = %s" % (i, repr(pkcs_7_unpad(cases[i])))
except PaddingException:
print "Case %d went wrong. Caught PaddingException." % i
