multiformats.multihash._hashfuns.utils

Utilities for hash function implementation.

Hashfun

class Hashfun(*args, **kwargs)

Bases: Protocol

Protocol for raw hash functions.

@runtime_checkable
class Hashfun(Protocol):
    def __call__(self, data: BytesLike, size: Optional[int] = None) -> bytes:
        ...

repeat_hashfun

repeat_hashfun(hashfun, repeat=1, truncate='end')

Utility function for repeated hashing.

Parameters:

• hashfun (Hashfun) –

• repeat (int; default = 1) –

• truncate (Literal['end', 'always']; default = 'end') –

Return type:

Hashfun

validate_hashfun_args

validate_hashfun_args(data, size, max_digest_size, *, size_required=False, name='')

Utility function to validate the arguments passed to hash functions.

Parameters:

• data (varint) –

• size (Optional[int]) –

• max_digest_size (Optional[int]) –

• size_required (bool; default = False) –

• name (str; default = '') –

Return type:

None