utils.py 文件源码

def decode_dss_signature(signature):
    try:
        data, remaining = decoder.decode(signature, asn1Spec=_DSSSigValue())
    except PyAsn1Error:
        raise ValueError("Invalid signature data. Unable to decode ASN.1")

    if remaining:
        raise ValueError(
            "The signature contains bytes after the end of the ASN.1 sequence."
        )

    r = int(data.getComponentByName('r'))
    s = int(data.getComponentByName('s'))
    return (r, s)