def __init__(self, cryptosystem, num_trustees, threshold, public_key_value,
verification_partial_public_keys):
"""
Creates a new threshold public key. Should not be invoked directly.
Instead of using this constructor from outside of PloneVoteCryptoLib,
please use ThresholdEncryptionSetUp.generate_public_key().
Arguments:
(see class attributes for cryptosystem, num_trustees and threshold)
public_key_value::long -- The actual value of the public key
(g^2P(0) mod p, see ThresholdEncryptionSetUp)
verification_partial_public_keys::long[]
-- A series of "partial public keys" (g^P(i) for each
trustee i), used for partial decryption verification.
Note that the key for trustee i must be on index i-1 of
the array.
"""
PublicKey.__init__(self, cryptosystem, public_key_value)
# Some checks:
if (threshold > num_trustees):
raise ValueError("Invalid parameters for the threshold public key:"\
" threshold must be smaller than the total number"\
" of trustees. Got num_trustees=%d, threshold=%d" \
% (num_trustees, threshold))
if (len(verification_partial_public_keys) != num_trustees):
raise ValueError("Invalid parameters for the threshold public key:"\
" a verification partial public for each trustee "\
"must be included.")
self.num_trustees = num_trustees
self.threshold = threshold
self._partial_public_keys = verification_partial_public_keys
def __init__(self, cryptosystem, num_trustees, threshold,
public_key_value, verification_partial_public_keys):
"""
Creates a new threshold public key. Should not be invoked directly.
Instead of using this constructor from outside of PloneVoteCryptoLib,
please use ThresholdEncryptionSetUp.generate_public_key().
Arguments:
(see class attributes for cryptosystem, num_trustees and threshold)
public_key_value::long -- The actual value of the public key
(g^2P(0) mod p, see ThresholdEncryptionSetUp)
verification_partial_public_keys::long[]
-- A series of "partial public keys" (g^P(i) for each
trustee i), used for partial decryption verification.
Note that the key for trustee i must be on index i-1 of
the array.
"""
PublicKey.__init__(self, cryptosystem, public_key_value)
# Some checks:
if(threshold > num_trustees):
raise ValueError("Invalid parameters for the threshold public key:"\
" threshold must be smaller than the total number"\
" of trustees. Got num_trustees=%d, threshold=%d" \
% (num_trustees, threshold))
if(len(verification_partial_public_keys) != num_trustees):
raise ValueError("Invalid parameters for the threshold public key:"\
" a verification partial public for each trustee "\
"must be included.")
self.num_trustees = num_trustees
self.threshold = threshold
self._partial_public_keys = verification_partial_public_keys
