Setting a group to an existing EVP_PKEY in OpenSSL 3

[Kory Hamzeh]

I haven’t done exactly what you are trying, but something similar.

 See EVP_PKEY_set_params:

https://www.openssl.org/docs/man3.0/man3/EVP_PKEY_set_params.html <https://www.openssl.org/docs/man3.0/man3/EVP_PKEY_set_params.html>

The specific parm to set the group could be set like this:

 OSSL_PARAM_BLD_push_utf8_string(param_bld, "group",                      
                                            curve, 0;



Please note that that I have not tested the above code as my code uses key-from-data. But I think it should work.


> On Oct 24, 2022, at 2:31 PM, Martin via openssl-users <openssl-users at openssl.org> wrote:
> 
> Hi,
>  
> How can I set a GROUP to an existing EC type EVP_PKEY in OpenSSL 3?
>  
> In 1.0.2 I was using this code having the EC_KEY:
>  
> EC_KEY_set_group(eckey, EC_GROUP_new_by_curve_name(nid));
>  
> In OpenSSL 3 still EC_GROUP_new_by_curve_name(nid) can be used, but I don’t know how to go from that to set it on the existing key.
>  
>  
> Thanks,
>  
> Martin

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