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# -*- coding: utf-8 -*-
from ..util.byteutil import ByteUtil
class DerivedMessageSecrets:
SIZE = 80
CIPHER_KEY_LENGTH = 32
MAC_KEY_LENGTH = 32
IV_LENGTH = 16
def __init__(self, okm):
keys = ByteUtil.split(okm,
self.__class__.CIPHER_KEY_LENGTH,
self.__class__.MAC_KEY_LENGTH,
self.__class__.IV_LENGTH)
self.cipherKey = keys[0] # AES
self.macKey = keys[1] # sha256
self.iv = keys[2]
def getCipherKey(self):
return self.cipherKey
def getMacKey(self):
return self.macKey
def getIv(self):
return self.iv
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