Hello Steve,

you are right. I corrected the code (see below). Now it works!
Thank you very much for your quick response.

...

/* encrypt content */
    cms = CMS_encrypt(NULL, in, cipher, nflags);
    if(!cms)
    {
        KWlog_appl ( EV_D_APPL_INFO , "CMS not allocated!" );
    }

    for (i = 0; i < sk_X509_num(encerts); i++) {

        CMS_RecipientInfo* r_info;
        EVP_PKEY_CTX* wrap_ctx = NULL;


        nflags |= CMS_KEY_PARAM;


                recip = sk_X509_value(encerts, i);
                r_info = CMS_add1_recipient_cert(cms, recip, nflags);
                if (!r_info) {
                                KWlog_appl(EV_E_APPL_INFO,
                                                "smime_encrypt_cms(): Error 
while adding recipient certs to CMS info
structure");
                                return false;
                }
                wrap_ctx = CMS_RecipientInfo_get0_pkey_ctx(r_info);
                KWlog ( EV_D_APPL_14 , "smime_encrypt_cms () Set OAEP Padding");
                if (EVP_PKEY_CTX_set_rsa_padding(wrap_ctx, 
RSA_PKCS1_OAEP_PADDING) <= 0)
                {
                        KWlog ( EV_D_APPL_14 , "smime_encrypt_cms () Error 
while setting OAEP
Padding");
                }
                EVP_PKEY_CTX_set_rsa_oaep_md(wrap_ctx, EVP_sha256());
                EVP_PKEY_CTX_set_rsa_mgf1_md(wrap_ctx, EVP_sha256());
                EVP_PKEY_CTX_set0_rsa_oaep_label(wrap_ctx, oaep_label, 
oaep_label_l);

        }



        KWlog ( EV_D_APPL_14 , "smime_encrypt_cms () CMS_final");
        CMS_final(cms, in, NULL, nflags);

...

Regards
Rudy 




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