size_t tls12_get_psigalgs(SSL *s, const unsigned char **psigs)
{
    /*
     * If Suite B mode use Suite B sigalgs only, ignore any other
     * preferences.
     */
# ifndef OPENSSL_NO_EC
    switch (tls1_suiteb(s)) {
    case SSL_CERT_FLAG_SUITEB_128_LOS:
        *psigs = suiteb_sigalgs;
        return sizeof(suiteb_sigalgs);

    case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
        *psigs = suiteb_sigalgs;
        return 2;

    case SSL_CERT_FLAG_SUITEB_192_LOS:
        *psigs = suiteb_sigalgs + 2;
        return 2;
    }
# endif
    /* If server use client authentication sigalgs if not NULL */
    if (s->server && s->cert->client_sigalgs) {
        *psigs = s->cert->client_sigalgs;
        return s->cert->client_sigalgslen;
    } else if (s->cert->conf_sigalgs) {
        *psigs = s->cert->conf_sigalgs;
        return s->cert->conf_sigalgslen;
    } else {
        *psigs = tls12_sigalgs;
        return sizeof(tls12_sigalgs);
    }
}

Unknown