def encrypt(self, pk, M, object):
key = self.group.random(GT)
c1 = abenc.encrypt(pk, key, object)
# instantiate a symmetric enc scheme from this key
cipher = AuthenticatedCryptoAbstraction(sha1(key))
c2 = cipher.encrypt(M)
return { 'c1':c1, 'c2':c2 }
def encrypt(self, pk, gp, M, policy_str):
if type(M) != str and type(policy_str) != str: raise "message and policy not right type!"
key = group.random(GT)
c1 = abencma.encrypt(pk, gp, key, policy_str)
# instantiate a symmetric enc scheme from this key
cipher = AuthenticatedCryptoAbstraction(sha1(key))
c2 = cipher.encrypt(M)
return { 'c1':c1, 'c2':c2 }
def encrypt(self, pk, ID, M):
if type(M) != str: raise "message not right type!"
key = group.random(GT)
c1 = ibenc.encrypt(pk, ID, key)
# instantiate a symmetric enc scheme from this key
cipher = AuthenticatedCryptoAbstraction(sha1(key))
c2 = cipher.encrypt(M)
return { 'c1':c1, 'c2':c2 }
def decrypt(self, pk, sk, ct):
c1, c2 = ct['c1'], ct['c2']
key = self.pkenc.decrypt(pk, sk, c1)[:self.key_len]
if debug: print("Rec key =>", key,", len =", len(key))
cipher = AuthenticatedCryptoAbstraction(key)
msg = cipher.decrypt(c2)
if debug: print("Rec msg =>", msg)
return msg
def encrypt(self, pk, M):
# generate a short session key, K and encrypt using pkenc
key = urandom(self.key_len)
# encrypt session key using PKEnc
c1 = self.pkenc.encrypt(pk, key)
# use symmetric key encryption to enc actual message
cipher = AuthenticatedCryptoAbstraction(key)
c2 = cipher.encrypt(M)
if debug: print("Ciphertext 2...")
if debug: print(c2)
return { 'c1':c1, 'c2':c2 }
def decrypt(self, gp, sk, ct):
c1, c2 = ct['c1'], ct['c2']
key = abencma.decrypt(gp, sk, c1)
cipher = AuthenticatedCryptoAbstraction(sha1(key))
return cipher.decrypt(c2)
def decrypt(self, pk, ID, ct):
c1, c2 = ct['c1'], ct['c2']
key = ibenc.decrypt(pk, ID, c1)
cipher = AuthenticatedCryptoAbstraction(sha1(key))
return cipher.decrypt(c2)
def SymEnc(s2_sesskey, M):
getUserGlobals()
cipher = AuthenticatedCryptoAbstraction(s2_sesskey)
return cipher.encrypt(M)
def SymDec(s2_sesskey, T1):
getUserGlobals()
cipher = AuthenticatedCryptoAbstraction(s2_sesskey)
return cipher.decrypt(T1)
def SymEnc(s2_sesskey, M): getUserGlobals() cipher = AuthenticatedCryptoAbstraction(s2_sesskey) return cipher.encrypt(M)
def SymDec(s2_sesskey, T1): getUserGlobals() cipher = AuthenticatedCryptoAbstraction(s2_sesskey) return cipher.decrypt(T1)
def decrypt(self, ct, sk):
c1, c2 = ct["c1"], ct["c2"]
key = abenc.decrypt(c1, sk)
cipher = AuthenticatedCryptoAbstraction(sha1(key))
return cipher.decrypt(c2)