extensions.c

            *al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_TLS_PARSE_CLIENTHELLO_KEY_SHARE, SSL_R_BAD_ECPOINT);
            return 0;
        }

        found = 1;
    }

    return 1;
}

#ifndef OPENSSL_NO_EC
static int tls_parse_clienthello_supported_groups(SSL *s, PACKET *pkt, int *al)
{
    PACKET supported_groups_list;

    /* Each group is 2 bytes and we must have at least 1. */
    if (!PACKET_as_length_prefixed_2(pkt, &supported_groups_list)
            || PACKET_remaining(&supported_groups_list) == 0
            || (PACKET_remaining(&supported_groups_list) % 2) != 0) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }

    if (!s->hit
            && !PACKET_memdup(&supported_groups_list,
                              &s->session->tlsext_supportedgroupslist,
                              &s->session->tlsext_supportedgroupslist_length)) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }

    return 1;
}
#endif

static int tls_parse_clienthello_ems(SSL *s, PACKET *pkt, int *al)
{
    /* The extension must always be empty */
    if (PACKET_remaining(pkt) != 0) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }

    s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;

    return 1;
}