def instantiateCipher(self, mode, message):
self.alg, self.key_len = AES, 16
# hash GT msg into a hex string
key = sha1(message)[0:self.key_len]
iv = '6543210987654321' # static IV (for testing)
PRP_method = selectPRP(self.alg, (key, mode, iv))
return PRP_method
def getPRP(self, message):
self.mode, self.key_len = AES, 16
# hash GT msg into a hex string
key = sha1(message)[0:self.key_len]
iv = '6543210987654321' # static IV (for testing)
PRP_method = selectPRP(AES, (key, MODE_CBC, iv))
return PRP_method
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 instantiateCipher(self, mode, message):
self.alg, self.key_len = AES, 16
# hash GT msg into a hex string
key = sha1(message)[0:self.key_len]
iv = '6543210987654321' # static IV (for testing)
PRP_method = selectPRP(self.alg, (key, mode, iv))
return PRP_method
def getPRP(self, message):
self.mode, self.key_len = AES, 16
# hash GT msg into a hex string
key = sha1(message)[0:self.key_len]
iv = '6543210987654321' # static IV (for testing)
PRP_method = selectPRP(AES, (key, MODE_CBC, iv))
return PRP_method
def elmtToString(self, g, length):
hash_len = 20
b = math.ceil(length / hash_len)
gStr = b""
for i in range(1, b + 1):
gStr += sha1(g, i)
return gStr[:length]
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 keyenc(self, params, ID, msg):
s = group.random()
A = sha1(params['v'] ** s) # session key
B = params['Y'] ** s
C = (params['X'] ** s) * (params['g'] ** (s * ID))
# use prf here?
ciph = { 'B': B, 'C': C }
return (A, ciph) # user must destroy A since it protects the msg
def keyenc(self, params, ID, msg):
s = group.random()
A = sha1(params['v']**s) # session key
B = params['Y']**s
C = (params['X']**s) * (params['g']**(s * ID))
# use prf here?
ciph = {'B': B, 'C': C}
return (A, ciph) # user must destroy A since it protects the msg
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 keydec(self, pk, dID, CT):
A, B, C = CT['A'], CT['B'], CT['C']
v_s = pair(((B ** dID['r']) * C), dID['K'])
return sha1(v_s)
def keydec(self, pk, dID, CT):
A, B, C = CT['A'], CT['B'], CT['C']
v_s = pair(((B**dID['r']) * C), dID['K'])
return sha1(v_s)
def decrypt(self, ct, sk):
c1, c2 = ct["c1"], ct["c2"]
key = abenc.decrypt(c1, sk)
cipher = AuthenticatedCryptoAbstraction(sha1(key))
return cipher.decrypt(c2)
