crypto: expose ECDH class

For consistency with the rest of the crypto classes, exposes the ECDH
class. Originally, only the createECDH function was exposed, and there
was no real reason to hide the class.

PR-URL: https://github.com/nodejs/node/pull/8188
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

2 files changed, 5 insertions, 5 deletions

diff --git a/lib/crypto.js b/lib/crypto.js
index 1c8c6b36fb..eb797b86ee 100644
--- a/lib/crypto.js
+++ b/lib/crypto.js
@@ -79,10 +79,6 @@ const {
 } = require('internal/crypto/util');
 const Certificate = require('internal/crypto/certificate');
 
-function createECDH(curve) {
-  return new ECDH(curve);
-}
-
 module.exports = exports = {
   // Methods
   _toBuf: toBuf,
@@ -92,7 +88,7 @@ module.exports = exports = {
   createDecipheriv: Decipheriv,
   createDiffieHellman: DiffieHellman,
   createDiffieHellmanGroup: DiffieHellmanGroup,
-  createECDH,
+  createECDH: ECDH,
   createHash: Hash,
   createHmac: Hmac,
   createSign: Sign,
@@ -124,6 +120,7 @@ module.exports = exports = {
   Decipheriv,
   DiffieHellman,
   DiffieHellmanGroup,
+  ECDH,
   Hash,
   Hmac,
   Sign,
diff --git a/lib/internal/crypto/diffiehellman.js b/lib/internal/crypto/diffiehellman.js
index b891a0b354..71fd13819c 100644
--- a/lib/internal/crypto/diffiehellman.js
+++ b/lib/internal/crypto/diffiehellman.js
@@ -168,6 +168,9 @@ DiffieHellman.prototype.setPrivateKey = function setPrivateKey(key, encoding) {
 
 
 function ECDH(curve) {
+  if (!(this instanceof ECDH))
+    return new ECDH(curve);
+
   if (typeof curve !== 'string')
     throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'curve', 'string');