binary.py 文件源码

def ab64_decode(data):
    """
    decode from shortened base64 format which omits padding & whitespace.
    uses custom ``./`` altchars, but supports decoding normal ``+/`` altchars as well.

    it is primarily used by Passlib's custom pbkdf2 hashes.
    """
    if isinstance(data, unicode):
        # needs bytes for replace() call, but want to accept ascii-unicode ala a2b_base64()
        try:
            data = data.encode("ascii")
        except UnicodeEncodeError:
            raise suppress_cause(ValueError("string argument should contain only ASCII characters"))
    return b64s_decode(data.replace(b".", b"+"))

#=============================================================================
# base32 codec
#=============================================================================