OSSL_PARAM_construct_BN
*ctx->params = OSSL_PARAM_construct_BN(translation->param_key,
params[0] = OSSL_PARAM_construct_BN(key_name, buffer, sizeof(buffer));
params[0] = OSSL_PARAM_construct_BN(key_name, buffer, bsize);
OSSL_PARAM OSSL_PARAM_construct_BN(const char *key, unsigned char *buf,
params[n++] = OSSL_PARAM_construct_BN("bignum", ubuf, sizeof(ubuf));
params[n++] = OSSL_PARAM_construct_BN("p3", bignumbin, sizeof(bignumbin));