generate ec and rsa keypiars for web

index.js

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+;(function (exports) {
+'use strict';
+
+var PromiseA;
+try {
+  /*global Promise*/
+  PromiseA = Promise;
+} catch(e) {
+  PromiseA = require('bluebird');
+}
+
+
+// https://stackoverflow.com/questions/40314257/export-webcrypto-key-to-pem-format
+function derToPem(keydata, pemName, privacy){
+  var keydataS = arrayBufferToString(keydata);
+  var keydataB64 = window.btoa(keydataS);
+  var keydataB64Pem = formatAsPem(keydataB64, pemName, privacy);
+  return keydataB64Pem;
+}
+
+function arrayBufferToString( buffer ) {
+  var binary = [];
+  var bytes = new Uint8Array( buffer );
+  var len = bytes.byteLength;
+  for (var i = 0; i < len; i++) {
+      binary.push(String.fromCharCode( bytes[ i ] ));
+  }
+  return binary.join('');
+}
+
+
+function formatAsPem(str, pemName, privacy) {
+  var privstr = (privacy ? privacy + ' ' : '');
+  var finalString = '-----BEGIN ' + pemName + ' ' + privstr + 'KEY-----\n';
+
+  while (str.length > 0) {
+      finalString += str.substring(0, 64) + '\n';
+      str = str.substring(64);
+  }
+
+  finalString = finalString + '-----END ' + pemName + ' ' + privstr + 'KEY-----';
+
+  return finalString;
+}
+
+var Keypairs = exports.Keypairs = {
+  generate: function(opts) {
+    if (!opts) { opts = {}; }
+    if (!opts.type) { opts.type = 'EC'; }
+
+    var supported = [ 'EC', 'RSA' ];
+    if (-1 === supported.indexOf(opts.type)) {
+      return PromiseA.reject(new Error("'" + opts.type + "' not implemented. Try one of " + supported.join(', ')));
+    }
+
+    if ('EC' === opts.type) {
+      return Keypairs._generateEc(opts);
+    }
+    if ('RSA' === opts.type) {
+      return Keypairs._generateRsa(opts);
+    }
+  }
+, _generateEc: function (opts) {
+    if (!opts.namedCurve) { opts.namedCurve = 'P-256'; }
+    if ('P-256' !== opts.namedCurve) {
+      console.warn("'" + opts.namedCurve + "' is not supported, but it _might_ happen to work anyway.");
+    }
+
+    // https://github.com/diafygi/webcrypto-examples#ecdsa---generatekey
+    var extractable = true;
+
+    return window.crypto.subtle.generateKey(
+      { name: "ECDSA", namedCurve: opts.namedCurve }
+    , extractable
+    , [ 'sign', 'verify' ]
+    ).then(function (result) {
+      return window.crypto.subtle.exportKey(
+        "jwk"
+      , result.privateKey
+      ).then(function (jwk) {
+        return window.crypto.subtle.exportKey(
+          "pkcs8"
+        , result.privateKey
+        ).then(function (keydata) {
+          return {
+            type: 'EC'
+          , privateJwk: jwk
+          , privatePem: derToPem(keydata, 'EC', 'PRIVATE')
+          };
+        });
+      });
+    });
+  }
+, _generateRsa: function (opts) {
+    if (!opts.bitlength) { opts.bitlength = 2048; }
+    if (-1 === [ 2048, 4096 ].indexOf(opts.bitlength)) {
+      return PromiseA.reject("opts.bitlength = (" + typeof opts.bitlength + ") " + opts.bitlength + ": Are you serious?");
+    }
+
+    // https://github.com/diafygi/webcrypto-examples#rsa---generatekey
+    var extractable = true;
+
+    return window.crypto.subtle.generateKey(
+      { name: "RSASSA-PKCS1-v1_5"
+      , modulusLength: opts.bitlength
+      , publicExponent: new Uint8Array([0x01, 0x00, 0x01])
+      , hash: { name: "SHA-256" }
+      }
+    , extractable
+    , [ 'sign', 'verify' ]
+    ).then(function (result) {
+      return window.crypto.subtle.exportKey(
+        "jwk"
+      , result.privateKey
+      ).then(function (jwk) {
+        return window.crypto.subtle.exportKey(
+          "pkcs8"
+        , result.privateKey
+        ).then(function (keydata) {
+          return {
+            type: 'RSA'
+          , privateJwk: jwk
+          , privatePem: derToPem(keydata, 'RSA', 'PRIVATE')
+          };
+        });
+      });
+    });
+  }
+};
+
+}('undefined' === typeof module ? window : module.exports));
+
+// How we might use this
+// var Keypairs = require('keypairs').Keypairs

package.json

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+{
+  "name": "keypairs",
+  "version": "1.0.0",
+  "description": "Interchangeably use RSA & ECDSA with PEM and JWK for Signing, Verifying, CSR generation and JOSE. Ugh... that was a mouthful.",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://git.coolaj86.com/coolaj86/keypairs.js"
+  },
+  "keywords": [
+    "EC",
+    "RSA",
+    "ECDSA",
+    "PEM",
+    "JWK",
+    "CSR",
+    "JOSE"
+  ],
+  "author": "AJ ONeal <coolaj86@gmail.com> (https://coolaj86.com/)",
+  "license": "(MIT OR Apache-2.0)"
+}