noise_mix_ss
if (noise_mix_ss(hs.hs_ck, key, r->r_ss) != 0)
static int noise_mix_ss(uint8_t ck[NOISE_HASH_LEN], uint8_t [NOISE_SYMMETRIC_KEY_LEN],
if (noise_mix_ss(hs->hs_ck, key, r->r_ss) != 0)