OSSL_ENCODER_get0_name
OSSL_ENCODER_get0_name(encoder));
OSSL_ENCODER_get0_name(encoder),
OSSL_ENCODER_get0_name(ei->encoder),
data->data_type = OSSL_ENCODER_get0_name(current_encoder);
const char *OSSL_ENCODER_get0_name(const OSSL_ENCODER *kdf);