def decryptionECB(key, ciphertext): cipher = tl.h2b(ciphertext[0]) result = "" for x in xrange(0, (len(cipher)/64)): result += aes.decryption(key, cipher[(x*64):(x*64+64)]) result = tl.unPadding(result, ciphertext[1]) return result
def decryptionCTR(key,ciphertext,original_Counter,padding_size):
count = len(ciphertext)/16
plain=''
encryCounter_List = getCounter(tl.b2h(original_Counter),count,key)
for i in xrange(0,count,1):
plain+= str(tl.b2h(tl.xor(tl.h2b(encryCounter_List[i]),tl.h2b(ciphertext[i*16:(i*16)+16]))))
plain = tl.unPadding(plain,padding_size)
return plain
def decryptionOFB(iv, key, ciphertext,padding_size): biCipher = ciphertext count = len(biCipher)/64 plain = [] for i in xrange(0,count,1): iv = tl.h2b(aes.encryption(key, iv)) biC = ciphertext[i*64:(i*64)+64] plain += tl.xor(iv, biC) plainStr = tl.b2h(plain) plainStr = tl.unPadding(plainStr,padding_size) return plainStr
def decryptionCFB(key,ciphertext,iv): hexCipher = tl.h2b(ciphertext[0]) count = len(tl.h2b(ciphertext[0]))/64 plain = '' for i in xrange(0,count,1): key_plain = tl.h2b(aes.encryption(key,iv)) p = tl.b2h(tl.xor(key_plain,hexCipher[i*64:(i*64)+64])) iv = hexCipher[i*64:(i*64)+64] plain += p plain = tl.unPadding(plain, ciphertext[1]) return plain