templates.asymmetric_encryption_scheme module

Generic classes used for creating an asymmetric encryption scheme.

class templates.asymmetric_encryption_scheme.AsymmetricEncryptionScheme(public_key, secret_key, *_args, **_kwargs)

Bases: Generic[KM, PT, RP, CV, CT, PK, SK], EncryptionScheme[KM, PT, RP, CV, CT], ABC

Abstract base class for an AsymmetricEncryptionScheme. Subclass of EncryptionScheme.

__init__(public_key, secret_key, *_args, **_kwargs)

Construct an AsymmetricEncryptionScheme with the given keypair and optional keyword arguments. All keyword arguments are combined with the public key to create an ID, so all the __init__ of a custom subclass of AsymmetricEncryptionScheme should pass all their parameter values as keyword arguments to this __init__ for the ID generation to work properly. If this does not happen, then schemes might be considered equal when they are totally different.

Parameters:

• public_key (TypeVar(PK, bound= PublicKey)) – Asymmetric PublicKey.

• secret_key (Optional[TypeVar(SK, bound= SecretKey)]) – Asymmetric SecretKey, might be None when the SecretKey is unknown.

• *_args (Any) – Optional extra arguments for the constructor of a concrete implementation.

• **_kwargs (Any) – Optional extra keyword arguments for the constructor of a concrete implementation.

classmethod from_public_key(public_key, **kwargs)

Generate a new AsymmetricEncryptionScheme from a public key (e.g. when received from another party) and possibly additional parameters.

Parameters:

• public_key (TypeVar(PK, bound= PublicKey)) – The PublicKey of this scheme instantiation.

• **kwargs (Any) – Optional extra keyword arguments for the constructor.

Return type:

Self

Returns:

A new EncryptionScheme.

classmethod from_security_parameter(*args, **kwargs)

Generate a new AsymmetricEncryptionScheme from a security parameter. Note that regular arguments will be passed to the generate_key_material method, so all parameter that are required for the constructor should be passed as keyword arguments.

Parameters:

• *args (Any) – Security parameter(s) for key generation.

• **kwargs (Any) – Security parameter(s) and optional extra arguments for the constructor.

Raises:

ValueError – If a keyword argument is not valid for key generation or the constructor.

Return type:

Self

Returns:

A new EncryptionScheme.

abstractmethod classmethod generate_key_material(*args, **kwargs)

Method to generate key material (PublicKey and SecretKey) for this scheme.

Parameters:

• *args (Any) – Required arguments to generate said key material.

• **kwargs (Any) – Required arguments to generate said key material.

Return type:

TypeVar(KM)

Returns:

Tuple containing first the PublicKey of this scheme and then the SecretKey.

property public_key: PK

PublicKey of this instantiation of the scheme.

Returns:

PublicKey of this instantiation.

property secret_key: SK | None

SecretKey of this instantiation of the scheme.

Returns:

SecretKey of this instantiation, or None when it is unknown.

class templates.asymmetric_encryption_scheme.PublicKey(*args, **kwargs)

Bases: Protocol

Public Key of an AsymmetricEncryptionScheme.

This should be subclassed for every AsymmetricEncryptionScheme.

static deserialize(obj, **_kwargs)

Deserialization function for public keys, which will be passed to the communication module.

Parameters:

• obj (Any) – serialized version of a PublicKey.

• **_kwargs (Any) – optional extra keyword arguments

Raises:

SerializationError – When communication library is not installed.

Return type:

PublicKey

Returns:

Deserialized PublicKey from the given dict.

serialize(**_kwargs)

Serialization function for public keys, which will be passed to the communication module.

Parameters:

**_kwargs (Any) – Optional extra keyword arguments.

Raises:

SerializationError – When communication library is not installed.

Return type:

Any

Returns:

serialized version of this PublicKey.

class templates.asymmetric_encryption_scheme.SecretKey(*args, **kwargs)

Bases: Protocol

Secret Key of an AsymmetricEncryptionScheme.

This should be subclassed for every AsymmetricEncryptionScheme.

static deserialize(obj, **_kwargs)

Deserialization function for public keys, which will be passed to the communication module.

Parameters:

• obj (Any) – serialized version of a SecretKey.

• **_kwargs (Any) – optional extra keyword arguments

Raises:

SerializationError – When communication library is not installed.

Return type:

SecretKey

Returns:

Deserialized SecretKey from the given dict.

serialize(**_kwargs)

Serialization function for secret keys, which will be passed to the communication module.

Parameters:

**_kwargs (Any) – Optional extra keyword arguments.

Raises:

SerializationError – When communication library is not installed.

Return type:

Any

Returns:

serialized version of this SecretKey.