Re: [PATCH v6 2/4] x509: Detect sm2 keys by their parameters OID

[Stefan Berger <stefanb@xxxxxxxxxxxxx>]

On 2/1/21 5:39 AM, Tianjia Zhang wrote:
> > index f7ad43f28579..508e0b34b5f0 100644
> > --- a/lib/oid_registry.c
> > +++ b/lib/oid_registry.c
> > @@ -11,6 +11,7 @@
> >   #include <linux/kernel.h>
> >   #include <linux/errno.h>
> >   #include <linux/bug.h>
> > +#include <linux/asn1.h>
> >   #include "oid_registry_data.c"
> >     MODULE_DESCRIPTION("OID Registry");
> > @@ -92,6 +93,18 @@ enum OID look_up_OID(const void *data, size_t 
> > datasize)
> >   }
> >   EXPORT_SYMBOL_GPL(look_up_OID);
> >   +int parse_OID(const void *data, size_t datasize, enum OID *oid)
> > +{
> > +    const unsigned char *v = data;
> > +
> > +    if (datasize < 2 || v[0] != ASN1_OID || v[1] != datasize - 2)
> > +        return -EBADMSG;
> > +
> > +    *oid = look_up_OID(data + 2, datasize - 2);
> > +    return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(parse_OID);
> > +
> >   /*
> >    * sprint_OID - Print an Object Identifier into a buffer
> >    * @data: The encoded OID to print
>
> Great job, I'm just curious why we need to add a new function, this 
> seems unnecessary, if possible, please add


Thanks. I call this function in two places now. I thought it was 'worth it'.


> Reviewed-by: Tianjia Zhang <tianjia.zhang@xxxxxxxxxxxxxxxxx>
>
> Best regards,
> Tianjia