RSA provider use example

[Antonio Santagiuliana]

Hello , thank you all for the replies. Very useful.
I have seen in Openssl/crypto/RSA/rsa_local.h the definition of rsa_st has
a pointer to RSA_METHOD and I can't see this filled in in any of the
examples' set up or initializations, where is it filled in for the default
provider , for the RSA algorithm?
I can see the methods pointers are used later down in the call chain from
RSA_private_decrypt() in providers/implementation/asymciphers/rsa_enc but I
can't find where these methods' pointers are set and I would like to
understand how I could pass a different method pointer in the parameters
for a different mod_exp operation , for example, or how I could set it on a
completely new RSA implementation mimicking the one in the default provider
but with different methods where I need them changed, minimizing the
differences with the default provider's RSA.
Thank you


On Fri, 24 Sep 2021, 12:22 Matt Caswell, <matt at openssl.org> wrote:

>
>
> On 24/09/2021 12:17, Dr Paul Dale wrote:
> > What about: apps/rsa.c, apps/rsautl.c and apps/genrsa.c
> > 3.0 doesn't use the RSA structure in the non-deprecated public API.
> >
> > You probably want the EVP_PKEY_fromdata call.
>
> An example of building an RSA key from its constituent parts is
> available on the EVP_PKEY_fromdata() man page:
>
> https://www.openssl.org/docs/man3.0/man3/EVP_PKEY_fromdata.html
>
> Matt
>
>
> >
> >
> > Pauli
> >
> >
> > On 24/9/21 8:55 pm, Antonio Santagiuliana wrote:
> >> Hello
> >> Is there any app or command in the current Openssl master repository
> >> that initialises and uses the new RSA provider?
> >> I would like to see how the RSA* context parameter is filled in and
> >> used, but I can't find an example using the RSA provider.
> >>
> >>
> >> Thank you
> >>
> >
>
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