compat.sh: skip static ECDH cases if unsupported in openssl

This commit add support to detect if openssl used for testing
supports static ECDH key exchange. Skip the ciphersutes if
openssl doesn't support them.

Signed-off-by: Pengyu Lv <pengyu.lv@arm.com>

tests/compat.sh

@@ -534,6 +534,15 @@ add_mbedtls_ciphersuites()
     esac
 }
 
+# o_check_ciphersuite STANDARD_CIPHER_SUITE
+o_check_ciphersuite()
+{
+    if [ "${1#*ECDH_ECDSA*}" != "$1" ] && \
+       [ "X${O_SUPPORT_ECDH}" = "XNO" ]; then
+            SKIP_NEXT="YES"
+    fi
+}
+
 setup_arguments()
 {
     O_MODE=""
@@ -603,6 +612,11 @@ setup_arguments()
             ;;
     esac
 
+    case $($OPENSSL ciphers ALL) in
+        *ECDH-ECDSA*) O_SUPPORT_ECDH="YES";;
+        *)O_SUPPORT_ECDH="NO";;
+    esac
+
     if [ "X$VERIFY" = "XYES" ];
     then
         M_SERVER_ARGS="$M_SERVER_ARGS ca_file=data_files/test-ca_cat12.crt auth_mode=required"
@@ -1033,6 +1047,7 @@ for MODE in $MODES; do
                         start_server "OpenSSL"
                         translate_ciphers m $M_CIPHERS
                         for i in $ciphers; do
+                            o_check_ciphersuite "$i"
                             run_client mbedTLS ${i%%=*} ${i#*=}
                         done
                         stop_server