crypto.py 文件源码

def hash_bytes(data_bytes, output_len=None, algorithm=hashes.SHA1()):
    '''
    Extract and return output_len bytes from a hash of data_bytes.
    If output_len is None, return the full hash length.
    '''
    hash_context = hash_create(algorithm=algorithm)
    hash_context = hash_update(hash_context, data_bytes)
    return hash_extract(hash_context,
                        output_len=output_len,
                        make_context_reusable=False)

# Tor-specific hash functions