कोडिंग कार्यप्रवाह · PKCS#7 पैडिंग सत्यापन

def strip_pkcs7(data, block=16):
    if type(block) is not int or not 1 <= block <= 255:
        raise ValueError("padding.block")
    if type(data) is not bytes or not data or len(data) % block:
        raise ValueError("padding.length")
    count = data[-1]
    if not 1 <= count <= block or data[-count:] != bytes([count])*count:
        raise ValueError("padding.bytes")
    return data[:-count]