def kgc_generate_user(user_id: str):
with (kgc_path / 'master_key').open(mode='rb') as f:
master_key = pairing_pickle.load(group, f)
if (kgc_path / '{}'.format(user_id)).exists():
print('User with this id is already registered in this KGC')
else:
with (kgc_path / '{}'.format(user_id)).open(mode='wb') as f:
pairing_pickle.dump(group, pre.keyGen(master_key, user_id), f)
def reEncrypt(user, to_user, record, type_attribute):
ciphertext = data_helper.load(user, record)
# Retrieve the reencryption key
with (reencryption_path /
'from_{}_to_{}_type_{}'.format(user, to_user, type_attribute)).open(
mode='rb') as f:
re_encryption_key = pairing_pickle.load(group, f)
# Reencrypt the data
cipher = pre.reEncrypt(get_params(), re_encryption_key,
ciphertext[PHR.SYMKEY()])
ciphertext[PHR.SYMKEY()] = cipher
data_helper.save(to_user, type_attribute, ciphertext,
"reencryption_from_{}_{}".format(user, record))
return cipher
def get_params():
with (kgc_path / 'params').open(mode='rb') as f:
return pairing_pickle.load(group, f)
def load_user_key(user):
print('Loading user key: {}'.format(kgc_path / user))
with (kgc_path / user).open(mode='rb') as f:
user_key = pairing_pickle.load(group, f)
return user_key