Re: [PATCH v3 1/3] x509: Detect sm2 keys by their parameters OID

[Stefan Berger]

On 1/30/21 4:26 PM, Jarkko Sakkinen wrote:
> On Wed, 2021-01-27 at 07:33 -0500, Stefan Berger wrote:
> > From: Stefan Berger <stefanb@xxxxxxxxxxxxx>
> >
> > Detect whether a key is an sm2 type of key by its OID in the parameters
> > array rather than assuming that everything under OID_id_ecPublicKey
> > is sm2, which is not the case.
> >
> > Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
> > ---
> >   crypto/asymmetric_keys/x509_cert_parser.c | 13 ++++++++++++-
> >   1 file changed, 12 insertions(+), 1 deletion(-)
> >
> > diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c
> > index 52c9b455fc7d..4643fe5ed69a 100644
> > --- a/crypto/asymmetric_keys/x509_cert_parser.c
> > +++ b/crypto/asymmetric_keys/x509_cert_parser.c
> > @@ -459,6 +459,7 @@ int x509_extract_key_data(void *context, size_t hdrlen,
> >                            const void *value, size_t vlen)
> >   {
> >          struct x509_parse_context *ctx = context;
> > +       enum OID oid;
> >   
> >          ctx->key_algo = ctx->last_oid;
> >          switch (ctx->last_oid) {
> > @@ -470,7 +471,17 @@ int x509_extract_key_data(void *context, size_t hdrlen,
> >                  ctx->cert->pub->pkey_algo = "ecrdsa";
> >                  break;
> >          case OID_id_ecPublicKey:
> > -               ctx->cert->pub->pkey_algo = "sm2";
> > +               if (ctx->params_size < 2)
> Either a named constant, or at least a comment instead of just '2'.


I will look at the 2 entries whether they contain the expected values: 
ASN1_OID and length

Thanks!

   Stefan