Openssl 3.0.0. EVP_PKEY RSA is NULL

[Ken Goldman]

I am doing the following, but the EVP_PKEY->pkey->rsa is null.
Am I misusing the API or missing a step?

(error checking removed)

    EVP_PKEY            *rsa_pub_key = NULL;
    EVP_PKEY_CTX        *ctx = NULL;
    OSSL_PARAM_BLD      *param_bld = NULL;
    OSSL_PARAM          *params = NULL;

    BIGNUM *    n = NULL;
    BIGNUM *    e = NULL;

[these bignums are initialized using bin2bn]

        param_bld = OSSL_PARAM_BLD_new();
        irc = OSSL_PARAM_BLD_push_BN(param_bld, "n", n);
        irc = OSSL_PARAM_BLD_push_BN(param_bld, "e", e);
        params = OSSL_PARAM_BLD_to_param(param_bld);

(do I perhaps need an 'end'?

        ctx = EVP_PKEY_CTX_new_from_name(NULL, "RSA", NULL);
        irc = EVP_PKEY_fromdata_init(ctx);
        irc = EVP_PKEY_fromdata(ctx, (EVP_PKEY **)rsa_pub_key,          /* 
freed by caller */
                                EVP_PKEY_PUBLIC_KEY, params);

Probing rsa_pub_key here in the debugger.


type = 6
references = 1
rsa = 0  (probably NULL)