SHAKE wrappers

Digest

digest is a single operation equivalent to:

h = SHAKE.init()
h.update(some_data)
h.digest(length) # or h.finalize() or h.squeeze()

Naming convention

To test a function that implements digest, create a function with one of the following names:

CC_SHAKE_128_digest
CC_SHAKE_256_digest

Protocol

The function must implement the following protocol:

protocol crypto_condor.primitives.SHAKE.Xof

Represents a XOF.

XOFs must behave like __call__ to be tested with this module.

Classes that implement this protocol must have the following methods / attributes:

__call__(data, output_length)

Produces digests of any desired length.

Parameters:

• data (bytes) – The input data.

• output_length (int) – The desired length of the digest in bytes.

Returns:

The digest of the desired length.

Return type:

bytes

Example

We use PyCryptodome for the wrapper example:

"""Wrapper template for SHAKE implementations.

Usage:
    crypto-condor-cli test wrapper SHAKE shake_wrapper_example.py
"""

from Crypto.Hash import SHAKE128, SHAKE256


def CC_SHAKE_128_digest(data: bytes, output_length: int) -> bytes:
    """Hashes with SHAKE128."""
    return SHAKE128.new(data).read(output_length)


def CC_SHAKE_256_digest(data: bytes, output_length: int) -> bytes:
    """Hashes with SHAKE256."""
    return SHAKE256.new(data).read(output_length)