def METHOD_NAME (self, Buffer):
    if len (Buffer) < self._StructSize:
        return False
    (MonotonicCount, dwLength, wRevision, wCertificateType, CertType) = \
        struct.unpack (
                 self._StructFormat,
                 Buffer[0:self._StructSize]
                 )
    if CertType != self._EFI_CERT_TYPE_PKCS7_GUID.bytes_le:
        return False
    return True