def __init__(self, cryptosystem, private_key_value):
"""
Creates a new private key. Should not be invoked directly.
Instead of using this constructor from outside of PloneVoteCryptoLib,
please use the class methods EGCryptoSystem.new_key_pair() or
PrivateKey.from_file(file).
Arguments:
cryptosystem::EGCryptoSystem-- The ElGamal cryptosystem in which
this key is defined.
private_key_value::long -- The actual value of the private key.
"""
public_key_value = pow(cryptosystem.get_generator(), private_key_value,
cryptosystem.get_prime())
self.cryptosystem = cryptosystem
self.public_key = PublicKey(cryptosystem, public_key_value)
self._key = private_key_value
