87 lines
3.0 KiB
Plaintext
87 lines
3.0 KiB
Plaintext
|
/*global Promise*/
|
||
|
|
(function (exports) {
|
||
|
|
'use strict';
|
||
|
|
|
||
|
|
var Keypairs = exports.Keypairs = {};
|
||
|
|
|
||
|
|
Keypairs._stance = "We take the stance that if you're knowledgeable enough to"
|
||
|
|
+ " properly and securely use non-standard crypto then you shouldn't need Bluecrypt anyway.";
|
||
|
|
Keypairs._universal = "Bluecrypt only supports crypto with standard cross-browser and cross-platform support.";
|
||
|
|
Keypairs.generate = function (opts) {
|
||
|
|
var wcOpts = {};
|
||
|
|
if (!opts) {
|
||
|
|
opts = {};
|
||
|
|
}
|
||
|
|
if (!opts.kty) {
|
||
|
|
opts.kty = 'EC';
|
||
|
|
}
|
||
|
|
|
||
|
|
// ECDSA has only the P curves and an associated bitlength
|
||
|
|
if (/^EC/i.test(opts.kty)) {
|
||
|
|
wcOpts.name = 'ECDSA';
|
||
|
|
if (!opts.namedCurve) {
|
||
|
|
opts.namedCurve = 'P-256';
|
||
|
|
}
|
||
|
|
wcOpts.namedCurve = opts.namedCurve; // true for supported curves
|
||
|
|
if (/256/.test(wcOpts.namedCurve)) {
|
||
|
|
wcOpts.namedCurve = 'P-256';
|
||
|
|
wcOpts.hash = { name: "SHA-256" };
|
||
|
|
} else if (/384/.test(wcOpts.namedCurve)) {
|
||
|
|
wcOpts.namedCurve = 'P-384';
|
||
|
|
wcOpts.hash = { name: "SHA-384" };
|
||
|
|
} else {
|
||
|
|
return Promise.Reject(new Error("'" + wcOpts.namedCurve + "' is not an NIST approved ECDSA namedCurve. "
|
||
|
|
+ " Please choose either 'P-256' or 'P-384'. "
|
||
|
|
+ Keypairs._stance));
|
||
|
|
}
|
||
|
|
} else if (/^RSA$/i.test(opts.kty)) {
|
||
|
|
// Support PSS? I don't think it's used for Let's Encrypt
|
||
|
|
wcOpts.name = 'RSASSA-PKCS1-v1_5';
|
||
|
|
if (!opts.modulusLength) {
|
||
|
|
opts.modulusLength = 2048;
|
||
|
|
}
|
||
|
|
wcOpts.modulusLength = opts.modulusLength;
|
||
|
|
if (wcOpts.modulusLength >= 2048 && wcOpts.modulusLength < 3072) {
|
||
|
|
// erring on the small side... for no good reason
|
||
|
|
wcOpts.hash = { name: "SHA-256" };
|
||
|
|
} else if (wcOpts.modulusLength >= 3072 && wcOpts.modulusLength < 4096) {
|
||
|
|
wcOpts.hash = { name: "SHA-384" };
|
||
|
|
} else if (wcOpts.modulusLength < 4097) {
|
||
|
|
wcOpts.hash = { name: "SHA-512" };
|
||
|
|
} else {
|
||
|
|
// Public key thumbprints should be paired with a hash of similar length,
|
||
|
|
// so anything above SHA-512's keyspace would be left under-represented anyway.
|
||
|
|
return Promise.Reject(new Error("'" + wcOpts.modulusLength + "' is not within the safe and universally"
|
||
|
|
+ " acceptable range of 2048-4096. Typically you should pick 2048, 3072, or 4096, though other values"
|
||
|
|
+ " divisible by 8 are allowed. " + Keypairs._stance));
|
||
|
|
}
|
||
|
|
// TODO maybe allow this to be set to any of the standard values?
|
||
|
|
wcOpts.publicExponent = new Uint8Array([0x01, 0x00, 0x01]);
|
||
|
|
} else {
|
||
|
|
return Promise.Reject(new Error("'" + opts.kty + "' is not a well-supported key type."
|
||
|
|
+ Keypairs._universal
|
||
|
|
+ " Please choose either 'EC' or 'RSA' keys."));
|
||
|
|
}
|
||
|
|
|
||
|
|
var extractable = true;
|
||
|
|
return window.crypto.subtle.generateKey(
|
||
|
|
wcOpts
|
||
|
|
, extractable
|
||
|
|
, [ 'sign', 'verify' ]
|
||
|
|
).then(function (result) {
|
||
|
|
return window.crypto.subtle.exportKey(
|
||
|
|
"jwk"
|
||
|
|
, result.privateKey
|
||
|
|
).then(function (privJwk) {
|
||
|
|
// TODO remove
|
||
|
|
console.log('private jwk:');
|
||
|
|
console.log(JSON.stringify(privJwk, null, 2));
|
||
|
|
return {
|
||
|
|
privateKey: privJwk
|
||
|
|
};
|
||
|
|
});
|
||
|
|
});
|
||
|
|
};
|
||
|
|
|
||
|
|
}(window));
|