[openssl-users] rsaOAEP OID in X509 certificate

[Stephane van Hardeveld]

> > On Aug 14, 2018, at 4:55 PM, Stephane van Hardeveld
> <stephane at codingwizard.nl> wrote:
> >
> > If I would try this endeavour, what would be the best interface to set
this?
> > For creation, use the EVP_PKEY type with the EVP_PKEY_CTX, and set
> > attributes there?
> 
> You'll need a new EVP_PKEY type that is mostly like RSA, but specialized
> for OAEP.
Ok, makes sense
> 
> > Something like:
> > res = X509_set_pubkey(cert, contentKey);
> > EVP_DigestSignInit(ctx, &pkey_ctx, EVP_sha256(), NULL, contentKey);
> > EVP_PKEY_encrypt_init(pkey_ctx);
> > EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_OAEP_PADDING);
> > EVP_PKEY_CTX_set_signature_md(pkey_ctx, EVP_sha256());
> 
> Nothing in EVP_PKEY_CTX has any effect on the key.  The data flow
> is in the other direction.  Different key types lead to different
> EVP_PKEY_CTX objects that are used to process data with that key.
Thank you for clearing this up

Regards,
Stephane