Add FFDHE groups to supported_groups

There is at least one server that will not negotiate TLS_DHE_* cipher suites with TLS 1.2 and below if the supported_groups extension is present but does not include any DH groups. This commit adds the DH groups that are currently in the TLS 1.3 ClientHello to the TLS 1.2 and earlier ClientHello.

Author: dcooper16

testssl.sh

@@ -13213,11 +13213,11 @@ prepare_tls_clienthello() {
                # Supported Groups Extension
                extension_supported_groups="
                00, 0a,                    # Type: Supported Elliptic Curves , see RFC 4492
-               00, 3e, 00, 3c,            # lengths
+               00, 42, 00, 40,            # lengths
                00, 0e, 00, 0d, 00, 19, 00, 1c, 00, 1e, 00, 0b, 00, 0c, 00, 1b,
                00, 18, 00, 09, 00, 0a, 00, 1a, 00, 16, 00, 17, 00, 1d, 00, 08,
                00, 06, 00, 07, 00, 14, 00, 15, 00, 04, 00, 05, 00, 12, 00, 13,
-               00, 01, 00, 02, 00, 03, 00, 0f, 00, 10, 00, 11"
+               00, 01, 00, 02, 00, 03, 00, 0f, 00, 10, 00, 11, 01, 00, 01, 01"
           elif [[ 0x$tls_low_byte -gt 0x03 ]]; then
                # Supported Groups Extension
                if [[ ! "$process_full" =~ all ]] || ( [[ ! "$OSSL_NAME" =~ LibreSSL ]] && \