crypto.py 文件源码

def hash_create(algorithm=hashes.SHA1()):
    '''
    Create and return a new hash context for algorithm.
    Tor cells use SHA1 as a hash algorithm, except for v3 onion services,
    which use SHA3-256 for client to service cells.
    '''
    # cryptography doesn't have a SHA3 implementation (as of July 2017)
    return hashes.Hash(algorithm, backend=backends.default_backend())