bitmessage-js/lib/crypto-platform.browser.js
2014-12-27 18:18:14 +03:00

42 lines
1.2 KiB
JavaScript

/**
* Browser Bitmessage crypto implementation.
* Documentation: <http://www.w3.org/TR/WebCryptoAPI/>
* Browsers support: <http://caniuse.com/#feat=cryptography>
* Blink implementation details: <https://sites.google.com/a/chromium.org/dev/blink/webcrypto>
*/
"use strict";
require("es6-promise").polyfill();
var assert = require("assert");
var ripemd160 = require("ripemd160");
// Support `webkit` prefix for Safari (not tested yet).
// TODO(Kagami): Try to support IE11.
var subtle = window.crypto.subtle || window.crypto.webkitSubtle;
assert(subtle, "WebCryptoAPI is not supported");
exports.sha512 = function(buf) {
return subtle.digest({name: "SHA-512"}, buf).then(function(arr) {
return new Buffer(new Uint8Array(arr));
});
};
exports.sha256 = function(buf) {
return subtle.digest({name: "SHA-256"}, buf).then(function(arr) {
return new Buffer(new Uint8Array(arr));
});
};
exports.ripemd160 = function(buf) {
// XXX(Kagami): No support in browsers via Web Crypto API currently,
// so use module.
return Promise.resolve(ripemd160(buf));
};
exports.randomBytes = function(size) {
var arr = new Uint8Array(size);
window.crypto.getRandomValues(arr);
return new Buffer(arr);
};