slh_dsa_compute_pk_root
static int slh_dsa_compute_pk_root(SLH_DSA_HASH_CTX *ctx, SLH_DSA_KEY *out, int verify);
ret = slh_dsa_compute_pk_root(ctx, (SLH_DSA_KEY *)key, 1);
if (!slh_dsa_compute_pk_root(ctx, out, 0))