WIP: rsa-compat-style node v10 and v6 support

lib/generate-privkey-node-v6.js

@@ -0,0 +1,36 @@
+// Copyright 2016-2018 AJ ONeal. All rights reserved
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+'use strict';
+
+var curves = {
+  "P-256": "prime256v1" // 65
+, "secp256r1": "prime256v1"
+, "P-384": "secp384r1" // 97
+, "P-521": "secp521r1" // 133
+};
+var crv = "P-256";
+var ecdh = require('crypto').createECDH(curves[crv] || crv);
+var keys = ecdh.generateKeys(null, 'uncompressed');
+console.log(keys.length);
+console.log(keys.toString('hex'));
+keys = keys.slice(1);
+var x = keys.slice(0, keys.byteLength / 2);
+var y = keys.slice(keys.byteLength / 2);
+while (0 === x[0]) { x = x.slice(1); }
+while (0 === y[0]) { y = y.slice(1); }
+console.log({
+  kty: "EC"
+, crv: "P-XXX"
+, x: _toUrlBase64(x)
+, y: _toUrlBase64(y)
+});
+
+function _toUrlBase64(buf) {
+  return buf.toString('base64')
+    .replace(/\+/g, "-")
+    .replace(/\//g, "_")
+    .replace(/=/g,"")
+  ;
+}

lib/generate-privkey-node.js

@@ -0,0 +1,22 @@
+// Copyright 2016-2018 AJ ONeal. All rights reserved
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+'use strict';
+
+module.exports = function (crv) {
+  var keypair = require('crypto').generateKeyPairSync(
+    'ec'
+  , { namedCurve: crv
+    , privateKeyEncoding: { type: 'sec1', format: 'pem' }
+    , publicKeyEncoding: { type: 'spki', format: 'pem' }
+    }
+  );
+  var result = { privateKeyPem: keypair.privateKey.trim() };
+  return result;
+};
+
+if (require.main === module) {
+  var keypair = module.exports('P-256');
+  console.info(keypair.privateKeyPem);
+}