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vllm.multimodal.hasher

_get_hasher_factory cached 

_get_hasher_factory(algorithm: str) -> Callable[[], _Hash]

Get the hasher factory based on the configured algorithm.

Parameters:

Name Type Description Default
algorithm str

Hash algorithm name (blake3, sha256, or sha512)

 required

Returns a callable that creates a new hasher instance. Supports blake3 (default), sha256, and sha512 for FIPS compliance.

See: https://github.com/vllm-project/vllm/issues/18334

Source code in vllm/multimodal/hasher.py 
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@functools.lru_cache(maxsize=3)
def _get_hasher_factory(algorithm: str) -> Callable[[], "hashlib._Hash"]:
    """
    Get the hasher factory based on the configured algorithm.

    Args:
        algorithm: Hash algorithm name (blake3, sha256, or sha512)

    Returns a callable that creates a new hasher instance.
    Supports blake3 (default), sha256, and sha512 for FIPS compliance.

    See: https://github.com/vllm-project/vllm/issues/18334
    """
    algorithm = algorithm.lower()

    if algorithm == "blake3":
        from blake3 import blake3

        return blake3
    elif algorithm == "sha256":
        return hashlib.sha256
    elif algorithm == "sha512":
        return hashlib.sha512
    else:
        # This should never happen due to env_with_choices validation
        raise ValueError(f"Unsupported hash algorithm: {algorithm}")