Blake2bHashSet

class cometa.cryptography.blake2b_hash_set.Blake2bHashSet(ptr=None)[source]

Bases: Set[Blake2bHash]

Represents a set of Blake2b hashes.

This collection type is used throughout Cardano for storing sets of transaction IDs, key hashes, and other Blake2b hash values.

Example

>>> hash_set = Blake2bHashSet()
>>> hash_set.add(Blake2bHash.from_hex("00" * 32))
>>> len(hash_set)
1

__init__(ptr=None)[source]

Initializes a new Blake2bHashSet.

Parameters:: ptr – Optional FFI pointer to an existing hash set. If None, creates a new empty set.
Raises:: CardanoError – If creation fails or if ptr is an invalid handle.
Return type:: None

__enter__()[source]

Enters the context manager.

Return type:: Blake2bHashSet

__exit__(exc_type, exc_val, exc_tb)[source]

Exits the context manager.

Return type:: None

__repr__()[source]

Returns a string representation of the hash set.

Return type:: str

classmethod from_cbor(reader)[source]

Deserializes a Blake2bHashSet from CBOR data.

Parameters:: reader (CborReader) – A CborReader positioned at the hash set data.
Returns:: A new Blake2bHashSet deserialized from the CBOR data.
Raises:: CardanoError – If deserialization fails.
Return type:: Blake2bHashSet

classmethod from_list(hashes)[source]

Creates a Blake2bHashSet from an iterable of Blake2bHash objects.

Parameters:: hashes (Iterable[Blake2bHash]) – An iterable of Blake2bHash objects.
Returns:: A new Blake2bHashSet containing all the hashes.
Raises:: CardanoError – If creation fails.
Return type:: Blake2bHashSet

add(hash_value)[source]

Adds a hash to the set.

Parameters:: hash_value (Blake2bHash) – The Blake2bHash to add.
Raises:: CardanoError – If addition fails.
Return type:: None

get(index)[source]

Retrieves a hash at the specified index.

Parameters:

index (int) – The index of the hash to retrieve.

Returns:

The Blake2bHash at the specified index.

Raises:

CardanoError – If retrieval fails.
IndexError – If index is out of bounds.

Return type:

Blake2bHash

to_cbor(writer)[source]

Serializes the hash set to CBOR format.

Parameters:: writer (CborWriter) – A CborWriter to write the serialized data to.
Raises:: CardanoError – If serialization fails.
Return type:: None

__len__()[source]

Returns the number of hashes in the set.

Return type:: int

__getitem__(index)[source]

Retrieves a hash at the specified index.

Parameters:: index (int)
Return type:: Blake2bHash

__iter__()[source]

Iterates over all hashes in the set.

Return type:: Iterator[Blake2bHash]

__contains__(item)[source]

Checks if a hash is in the set.

Parameters:: item (Blake2bHash)
Return type:: bool

__eq__(other)[source]

Checks equality with another Blake2bHashSet.

Parameters:: other (object)
Return type:: bool

__hash__ = None

isdisjoint(other)[source]

Returns True if the set has no elements in common with other.

Parameters:: other (Iterable[Blake2bHash]) – Another iterable to compare with.
Returns:: True if the sets are disjoint.
Return type:: bool