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diff --git a/deps/node/deps/npm/node_modules/tweetnacl/README.md b/deps/node/deps/npm/node_modules/tweetnacl/README.md new file mode 100644 index 00000000..ffb6871d --- /dev/null +++ b/deps/node/deps/npm/node_modules/tweetnacl/README.md @@ -0,0 +1,459 @@ +TweetNaCl.js +============ + +Port of [TweetNaCl](http://tweetnacl.cr.yp.to) / [NaCl](http://nacl.cr.yp.to/) +to JavaScript for modern browsers and Node.js. Public domain. + +[ +](https://travis-ci.org/dchest/tweetnacl-js) + +Demo: <https://tweetnacl.js.org> + +**:warning: The library is stable and API is frozen, however it has not been +independently reviewed. If you can help reviewing it, please [contact +me](mailto:dmitry@codingrobots.com).** + +Documentation +============= + +* [Overview](#overview) +* [Installation](#installation) +* [Usage](#usage) + * [Public-key authenticated encryption (box)](#public-key-authenticated-encryption-box) + * [Secret-key authenticated encryption (secretbox)](#secret-key-authenticated-encryption-secretbox) + * [Scalar multiplication](#scalar-multiplication) + * [Signatures](#signatures) + * [Hashing](#hashing) + * [Random bytes generation](#random-bytes-generation) + * [Constant-time comparison](#constant-time-comparison) +* [System requirements](#system-requirements) +* [Development and testing](#development-and-testing) +* [Benchmarks](#benchmarks) +* [Contributors](#contributors) +* [Who uses it](#who-uses-it) + + +Overview +-------- + +The primary goal of this project is to produce a translation of TweetNaCl to +JavaScript which is as close as possible to the original C implementation, plus +a thin layer of idiomatic high-level API on top of it. + +There are two versions, you can use either of them: + +* `nacl.js` is the port of TweetNaCl with minimum differences from the + original + high-level API. + +* `nacl-fast.js` is like `nacl.js`, but with some functions replaced with + faster versions. + + +Installation +------------ + +You can install TweetNaCl.js via a package manager: + +[Bower](http://bower.io): + + $ bower install tweetnacl + +[NPM](https://www.npmjs.org/): + + $ npm install tweetnacl + +or [download source code](https://github.com/dchest/tweetnacl-js/releases). + + +Usage +----- + +All API functions accept and return bytes as `Uint8Array`s. If you need to +encode or decode strings, use functions from +<https://github.com/dchest/tweetnacl-util-js> or one of the more robust codec +packages. + +In Node.js v4 and later `Buffer` objects are backed by `Uint8Array`s, so you +can freely pass them to TweetNaCl.js functions as arguments. The returned +objects are still `Uint8Array`s, so if you need `Buffer`s, you'll have to +convert them manually; make sure to convert using copying: `new Buffer(array)`, +instead of sharing: `new Buffer(array.buffer)`, because some functions return +subarrays of their buffers. + + +### Public-key authenticated encryption (box) + +Implements *curve25519-xsalsa20-poly1305*. + +#### nacl.box.keyPair() + +Generates a new random key pair for box and returns it as an object with +`publicKey` and `secretKey` members: + + { + publicKey: ..., // Uint8Array with 32-byte public key + secretKey: ... // Uint8Array with 32-byte secret key + } + + +#### nacl.box.keyPair.fromSecretKey(secretKey) + +Returns a key pair for box with public key corresponding to the given secret +key. + +#### nacl.box(message, nonce, theirPublicKey, mySecretKey) + +Encrypt and authenticates message using peer's public key, our secret key, and +the given nonce, which must be unique for each distinct message for a key pair. + +Returns an encrypted and authenticated message, which is +`nacl.box.overheadLength` longer than the original message. + +#### nacl.box.open(box, nonce, theirPublicKey, mySecretKey) + +Authenticates and decrypts the given box with peer's public key, our secret +key, and the given nonce. + +Returns the original message, or `false` if authentication fails. + +#### nacl.box.before(theirPublicKey, mySecretKey) + +Returns a precomputed shared key which can be used in `nacl.box.after` and +`nacl.box.open.after`. + +#### nacl.box.after(message, nonce, sharedKey) + +Same as `nacl.box`, but uses a shared key precomputed with `nacl.box.before`. + +#### nacl.box.open.after(box, nonce, sharedKey) + +Same as `nacl.box.open`, but uses a shared key precomputed with `nacl.box.before`. + +#### nacl.box.publicKeyLength = 32 + +Length of public key in bytes. + +#### nacl.box.secretKeyLength = 32 + +Length of secret key in bytes. + +#### nacl.box.sharedKeyLength = 32 + +Length of precomputed shared key in bytes. + +#### nacl.box.nonceLength = 24 + +Length of nonce in bytes. + +#### nacl.box.overheadLength = 16 + +Length of overhead added to box compared to original message. + + +### Secret-key authenticated encryption (secretbox) + +Implements *xsalsa20-poly1305*. + +#### nacl.secretbox(message, nonce, key) + +Encrypt and authenticates message using the key and the nonce. The nonce must +be unique for each distinct message for this key. + +Returns an encrypted and authenticated message, which is +`nacl.secretbox.overheadLength` longer than the original message. + +#### nacl.secretbox.open(box, nonce, key) + +Authenticates and decrypts the given secret box using the key and the nonce. + +Returns the original message, or `false` if authentication fails. + +#### nacl.secretbox.keyLength = 32 + +Length of key in bytes. + +#### nacl.secretbox.nonceLength = 24 + +Length of nonce in bytes. + +#### nacl.secretbox.overheadLength = 16 + +Length of overhead added to secret box compared to original message. + + +### Scalar multiplication + +Implements *curve25519*. + +#### nacl.scalarMult(n, p) + +Multiplies an integer `n` by a group element `p` and returns the resulting +group element. + +#### nacl.scalarMult.base(n) + +Multiplies an integer `n` by a standard group element and returns the resulting +group element. + +#### nacl.scalarMult.scalarLength = 32 + +Length of scalar in bytes. + +#### nacl.scalarMult.groupElementLength = 32 + +Length of group element in bytes. + + +### Signatures + +Implements [ed25519](http://ed25519.cr.yp.to). + +#### nacl.sign.keyPair() + +Generates new random key pair for signing and returns it as an object with +`publicKey` and `secretKey` members: + + { + publicKey: ..., // Uint8Array with 32-byte public key + secretKey: ... // Uint8Array with 64-byte secret key + } + +#### nacl.sign.keyPair.fromSecretKey(secretKey) + +Returns a signing key pair with public key corresponding to the given +64-byte secret key. The secret key must have been generated by +`nacl.sign.keyPair` or `nacl.sign.keyPair.fromSeed`. + +#### nacl.sign.keyPair.fromSeed(seed) + +Returns a new signing key pair generated deterministically from a 32-byte seed. +The seed must contain enough entropy to be secure. This method is not +recommended for general use: instead, use `nacl.sign.keyPair` to generate a new +key pair from a random seed. + +#### nacl.sign(message, secretKey) + +Signs the message using the secret key and returns a signed message. + +#### nacl.sign.open(signedMessage, publicKey) + +Verifies the signed message and returns the message without signature. + +Returns `null` if verification failed. + +#### nacl.sign.detached(message, secretKey) + +Signs the message using the secret key and returns a signature. + +#### nacl.sign.detached.verify(message, signature, publicKey) + +Verifies the signature for the message and returns `true` if verification +succeeded or `false` if it failed. + +#### nacl.sign.publicKeyLength = 32 + +Length of signing public key in bytes. + +#### nacl.sign.secretKeyLength = 64 + +Length of signing secret key in bytes. + +#### nacl.sign.seedLength = 32 + +Length of seed for `nacl.sign.keyPair.fromSeed` in bytes. + +#### nacl.sign.signatureLength = 64 + +Length of signature in bytes. + + +### Hashing + +Implements *SHA-512*. + +#### nacl.hash(message) + +Returns SHA-512 hash of the message. + +#### nacl.hash.hashLength = 64 + +Length of hash in bytes. + + +### Random bytes generation + +#### nacl.randomBytes(length) + +Returns a `Uint8Array` of the given length containing random bytes of +cryptographic quality. + +**Implementation note** + +TweetNaCl.js uses the following methods to generate random bytes, +depending on the platform it runs on: + +* `window.crypto.getRandomValues` (WebCrypto standard) +* `window.msCrypto.getRandomValues` (Internet Explorer 11) +* `crypto.randomBytes` (Node.js) + +If the platform doesn't provide a suitable PRNG, the following functions, +which require random numbers, will throw exception: + +* `nacl.randomBytes` +* `nacl.box.keyPair` +* `nacl.sign.keyPair` + +Other functions are deterministic and will continue working. + +If a platform you are targeting doesn't implement secure random number +generator, but you somehow have a cryptographically-strong source of entropy +(not `Math.random`!), and you know what you are doing, you can plug it into +TweetNaCl.js like this: + + nacl.setPRNG(function(x, n) { + // ... copy n random bytes into x ... + }); + +Note that `nacl.setPRNG` *completely replaces* internal random byte generator +with the one provided. + + +### Constant-time comparison + +#### nacl.verify(x, y) + +Compares `x` and `y` in constant time and returns `true` if their lengths are +non-zero and equal, and their contents are equal. + +Returns `false` if either of the arguments has zero length, or arguments have +different lengths, or their contents differ. + + +System requirements +------------------- + +TweetNaCl.js supports modern browsers that have a cryptographically secure +pseudorandom number generator and typed arrays, including the latest versions +of: + +* Chrome +* Firefox +* Safari (Mac, iOS) +* Internet Explorer 11 + +Other systems: + +* Node.js + + +Development and testing +------------------------ + +Install NPM modules needed for development: + + $ npm install + +To build minified versions: + + $ npm run build + +Tests use minified version, so make sure to rebuild it every time you change +`nacl.js` or `nacl-fast.js`. + +### Testing + +To run tests in Node.js: + + $ npm run test-node + +By default all tests described here work on `nacl.min.js`. To test other +versions, set environment variable `NACL_SRC` to the file name you want to test. +For example, the following command will test fast minified version: + + $ NACL_SRC=nacl-fast.min.js npm run test-node + +To run full suite of tests in Node.js, including comparing outputs of +JavaScript port to outputs of the original C version: + + $ npm run test-node-all + +To prepare tests for browsers: + + $ npm run build-test-browser + +and then open `test/browser/test.html` (or `test/browser/test-fast.html`) to +run them. + +To run headless browser tests with `tape-run` (powered by Electron): + + $ npm run test-browser + +(If you get `Error: spawn ENOENT`, install *xvfb*: `sudo apt-get install xvfb`.) + +To run tests in both Node and Electron: + + $ npm test + +### Benchmarking + +To run benchmarks in Node.js: + + $ npm run bench + $ NACL_SRC=nacl-fast.min.js npm run bench + +To run benchmarks in a browser, open `test/benchmark/bench.html` (or +`test/benchmark/bench-fast.html`). + + +Benchmarks +---------- + +For reference, here are benchmarks from MacBook Pro (Retina, 13-inch, Mid 2014) +laptop with 2.6 GHz Intel Core i5 CPU (Intel) in Chrome 53/OS X and Xiaomi Redmi +Note 3 smartphone with 1.8 GHz Qualcomm Snapdragon 650 64-bit CPU (ARM) in +Chrome 52/Android: + +| | nacl.js Intel | nacl-fast.js Intel | nacl.js ARM | nacl-fast.js ARM | +| ------------- |:-------------:|:-------------------:|:-------------:|:-----------------:| +| salsa20 | 1.3 MB/s | 128 MB/s | 0.4 MB/s | 43 MB/s | +| poly1305 | 13 MB/s | 171 MB/s | 4 MB/s | 52 MB/s | +| hash | 4 MB/s | 34 MB/s | 0.9 MB/s | 12 MB/s | +| secretbox 1K | 1113 op/s | 57583 op/s | 334 op/s | 14227 op/s | +| box 1K | 145 op/s | 718 op/s | 37 op/s | 368 op/s | +| scalarMult | 171 op/s | 733 op/s | 56 op/s | 380 op/s | +| sign | 77 op/s | 200 op/s | 20 op/s | 61 op/s | +| sign.open | 39 op/s | 102 op/s | 11 op/s | 31 op/s | + +(You can run benchmarks on your devices by clicking on the links at the bottom +of the [home page](https://tweetnacl.js.org)). + +In short, with *nacl-fast.js* and 1024-byte messages you can expect to encrypt and +authenticate more than 57000 messages per second on a typical laptop or more than +14000 messages per second on a $170 smartphone, sign about 200 and verify 100 +messages per second on a laptop or 60 and 30 messages per second on a smartphone, +per CPU core (with Web Workers you can do these operations in parallel), +which is good enough for most applications. + + +Contributors +------------ + +See AUTHORS.md file. + + +Third-party libraries based on TweetNaCl.js +------------------------------------------- + +* [forward-secrecy](https://github.com/alax/forward-secrecy) — Axolotl ratchet implementation +* [nacl-stream](https://github.com/dchest/nacl-stream-js) - streaming encryption +* [tweetnacl-auth-js](https://github.com/dchest/tweetnacl-auth-js) — implementation of [`crypto_auth`](http://nacl.cr.yp.to/auth.html) +* [chloride](https://github.com/dominictarr/chloride) - unified API for various NaCl modules + + +Who uses it +----------- + +Some notable users of TweetNaCl.js: + +* [miniLock](http://minilock.io/) +* [Stellar](https://www.stellar.org/) |