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code/default/lib/noarch/tlslite/utils/aes.py
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XX-Net.dev
tlslite works
24 окт 2022, 03:43
24 окт 2022, 03:43
73d97ea
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# Author: Trevor Perrin # See the LICENSE file for legal information regarding use of this file. """Abstract class for AES.""" class AES(object): def __init__(self, key, mode, IV, implementation): if len(key) not in (16, 24, 32): raise AssertionError() if mode not in [2, 6]: raise AssertionError() if mode == 2: if len(IV) != 16: raise AssertionError() if mode == 6: if len(IV) > 16: raise AssertionError() self.isBlockCipher = True self.isAEAD = False self.block_size = 16 self.implementation = implementation if len(key)==16: self.name = "aes128" elif len(key)==24: self.name = "aes192" elif len(key)==32: self.name = "aes256" else: raise AssertionError() #CBC-Mode encryption, returns ciphertext #WARNING: *MAY* modify the input as well def encrypt(self, plaintext): assert(len(plaintext) % 16 == 0) #CBC-Mode decryption, returns plaintext #WARNING: *MAY* modify the input as well def decrypt(self, ciphertext): assert(len(ciphertext) % 16 == 0)