Merge branch 'staging' of github.com:xwiki-labs/cryptpad into staging
yflory
6 years ago
commit
a99e5a3aaa
@ -0,0 +1,156 @@
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define([
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'/common/common-util.js',
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'/api/config',
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'/bower_components/tweetnacl/nacl-fast.min.js',
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], function (Util, ApiConfig) {
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var Nacl = window.nacl;
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var Block = {};
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Block.join = Util.uint8ArrayJoin;
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// publickey <base64 string>
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// signature <base64 string>
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// block <base64 string>
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// [b64_public, b64_sig, b64_block [version, nonce, content]]
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Block.seed = function () {
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return Nacl.hash(Nacl.util.decodeUTF8('pewpewpew'));
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};
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// should be deterministic from a seed...
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Block.genkeys = function (seed) {
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if (!(seed instanceof Uint8Array)) {
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throw new Error('INVALID_SEED_FORMAT');
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}
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if (!seed || typeof(seed.length) !== 'number' || seed.length < 64) {
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throw new Error('INVALID_SEED_LENGTH');
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}
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var signSeed = seed.subarray(0, Nacl.sign.seedLength);
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var symmetric = seed.subarray(Nacl.sign.seedLength,
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Nacl.sign.seedLength + Nacl.secretbox.keyLength);
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console.log("symmetric key: ", Nacl.util.encodeBase64(symmetric));
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return {
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sign: Nacl.sign.keyPair.fromSeed(signSeed), // 32 bytes
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symmetric: symmetric, // 32 bytes ...
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};
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};
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// (UTF8 content, keys object) => Uint8Array block
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Block.encrypt = function (version, content, keys) {
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var u8 = Nacl.util.decodeUTF8(content);
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var nonce = Nacl.randomBytes(Nacl.secretbox.nonceLength);
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return Block.join([
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[0],
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nonce,
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Nacl.secretbox(u8, nonce, keys.symmetric)
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]);
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};
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// (uint8Array block) => payload object
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Block.decrypt = function (u8_content, keys) {
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// version is currently ignored since there is only one
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var nonce = u8_content.subarray(1, 1 + Nacl.secretbox.nonceLength);
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var box = u8_content.subarray(1 + Nacl.secretbox.nonceLength);
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var plaintext = Nacl.secretbox.open(box, nonce, keys.symmetric);
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try {
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return JSON.parse(Nacl.util.encodeUTF8(plaintext));
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} catch (e) {
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console.error(e);
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return;
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}
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};
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// (Uint8Array block) => signature
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Block.sign = function (ciphertext, keys) {
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return Nacl.sign.detached(Nacl.hash(ciphertext), keys.sign.secretKey);
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};
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Block.serialize = function (content, keys) {
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// encrypt the content
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var ciphertext = Block.encrypt(0, content, keys);
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// generate a detached signature
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var sig = Block.sign(ciphertext, keys);
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// serialize {publickey, sig, ciphertext}
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return {
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publicKey: Nacl.util.encodeBase64(keys.sign.publicKey),
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signature: Nacl.util.encodeBase64(sig),
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ciphertext: Nacl.util.encodeBase64(ciphertext),
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};
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};
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Block.remove = function (keys) {
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// sign the hash of the text 'DELETE_BLOCK'
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var sig = Nacl.sign.detached(Nacl.hash(
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Nacl.util.decodeUTF8('DELETE_BLOCK')), keys.sign.secretKey);
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return {
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publicKey: Nacl.util.encodeBase64(keys.sign.publicKey),
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signature: Nacl.util.encodeBase64(sig),
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};
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};
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// FIXME don't spread the functions below across this file and common-hash
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// find a permanent home for these hacks
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var urlSafeB64 = function (u8) {
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return Nacl.util.encodeBase64(u8).replace(/\//g, '-');
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};
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Block.getBlockHash = function (keys) {
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var publicKey = urlSafeB64(keys.sign.publicKey);
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// 'block/' here is hardcoded because it's hardcoded on the server
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// if we want to make CryptPad work in server subfolders, we'll need
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// to update this path derivation
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var relative = 'block/' + publicKey.slice(0, 2) + '/' + publicKey;
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var symmetric = urlSafeB64(keys.symmetric);
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return ApiConfig.httpUnsafeOrigin + relative + '#' + symmetric;
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};
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/*
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Block.createBlockHash = function (href, key) {
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if (typeof(href) !== 'string') { return; }
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if (!(key instanceof Uint8Array)) { return; }
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try { return href + '#' + Nacl.util.encodeBase64(key); }
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catch (e) { return; }
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};
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*/
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var decodeSafeB64 = function (b64) {
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try {
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return Nacl.util.decodeBase64(b64.replace(/\-/g, '/'));
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} catch (e) {
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console.error(e);
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return;
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}
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};
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Block.parseBlockHash = function (hash) {
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if (typeof(hash) !== 'string') { return; }
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var parts = hash.split('#');
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if (parts.length !== 2) { return; }
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try {
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return {
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href: parts[0],
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keys: {
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symmetric: decodeSafeB64(parts[1]),
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}
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};
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} catch (e) {
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console.error(e);
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return;
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}
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};
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return Block;
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});
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