tls: fix DEP0083 after upgrading to OpenSSL 1.1.0

doc/api/deprecations.md

@@ -1648,17 +1648,20 @@ the `REPLServer` itself. Do not use this function.
 ### DEP0083: Disabling ECDH by setting ecdhCurve to false
 <!-- YAML
 changes:
+  - version: v10.0.0
+    pr-url: https://github.com/nodejs/node/pull/19794
+    description: End-of-Life.
   - version: v9.2.0
     pr-url: https://github.com/nodejs/node/pull/16130
     description: Runtime deprecation.
 -->
 
-Type: Runtime
+Type: End-of-Life.
 
 The `ecdhCurve` option to `tls.createSecureContext()` and `tls.TLSSocket` could
-be set to `false` to disable ECDH entirely on the server only. This mode is
+be set to `false` to disable ECDH entirely on the server only. This mode was
 deprecated in preparation for migrating to OpenSSL 1.1.0 and consistency with
-the client. Use the `ciphers` parameter instead.
+the client and is now unsupported. Use the `ciphers` parameter instead.
 
 <a id="DEP0084"></a>
 ### DEP0084: requiring bundled internal dependencies

doc/api/tls.md

@@ -1007,6 +1007,10 @@ argument.
 <!-- YAML
 added: v0.11.13
 changes:
+  - version: v10.0.0
+    pr-url: https://github.com/nodejs/node/pull/19794
+    description: The `ecdhCurve` cannot be set to `false` anymore due to a
+                 change in OpenSSL.
   - version: v9.3.0
     pr-url: https://github.com/nodejs/node/pull/14903
     description: The `options` parameter can now include `clientCertEngine`.
@@ -1062,7 +1066,7 @@ changes:
     discarded and DHE ciphers will not be available.
   * `ecdhCurve` {string} A string describing a named curve or a colon separated
     list of curve NIDs or names, for example `P-521:P-384:P-256`, to use for
-    ECDH key agreement, or `false` to disable ECDH. Set to `auto` to select the
+    ECDH key agreement. Set to `auto` to select the
     curve automatically. Use [`crypto.getCurves()`][] to obtain a list of
     available curve names. On recent releases, `openssl ecparam -list_curves`
     will also display the name and description of each available elliptic curve.

lib/_tls_common.js

@@ -69,16 +69,6 @@ function validateKeyCert(name, value) {
 exports.SecureContext = SecureContext;
 
 
-function ecdhCurveWarning() {
-  if (ecdhCurveWarning.emitted) return;
-  process.emitWarning('{ ecdhCurve: false } is deprecated.',
-                      'DeprecationWarning',
-                      'DEP0083');
-  ecdhCurveWarning.emitted = true;
-}
-ecdhCurveWarning.emitted = false;
-
-
 exports.createSecureContext = function createSecureContext(options, context) {
   if (!options) options = {};
 
@@ -154,8 +144,6 @@ exports.createSecureContext = function createSecureContext(options, context) {
     c.context.setECDHCurve(tls.DEFAULT_ECDH_CURVE);
   else if (options.ecdhCurve)
     c.context.setECDHCurve(options.ecdhCurve);
-  else
-    ecdhCurveWarning();
 
   if (options.dhparam) {
     const warning = c.context.setDHParam(options.dhparam);