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README

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Kagami Hiiragi 2014-12-21 22:39:09 +03:00
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JavaScript Elliptic curve cryptography library for both browserify and node.
## Motivation
There is currently no any isomorphic ECC library which provide ECDSA, ECDH and ECIES for both Node.JS and Browser. So `eccrypto` is an attempt to create one. Current goals:
* Implement ECDSA
* Implement ECDH
* Implement ECIES
* Support secp256k1 curve, HMAC-SHA256 for ECDH and AES-256-CB for ECIES
Implementation details:
* Use Node.JS crypto module/library bindings where possible
* Use WebCryptoAPI where possible
* Promise-driven API
Possible future goals:
* Support other curves/KDF/MAC/encryptions
## Native crypto API limitations
### crypto
ECDH only works in Node 0.11+ (see https://github.com/joyent/node/pull/5854), ECDSA is supported only when keys are in PEM format (see https://github.com/joyent/node/issues/6904), ECIES is not supported at all.
### WebCryptoAPI
ECDSA and ECDH are supported in Chrome [only on Windows](https://sites.google.com/a/chromium.org/dev/blink/webcrypto#TOC-Supported-algorithms-as-of-Chrome-41-) (see also [bug 338883](https://code.google.com/p/chromium/issues/detail?id=338883)), aren't supported by Firefox (fixed only in 36.0+, see [bug 1034854](https://bugzilla.mozilla.org/show_bug.cgi?id=1034854)) and ECIES is not defined at all in WebCryptoAPI draft. Also WebCryptoAPI draft [currently defines](http://www.w3.org/TR/WebCryptoAPI/#EcKeyGenParams-dictionary) only curves recommended by NIST which means secp256k1 is not supported (see also: [[1](http://lists.w3.org/Archives/Public/public-webcrypto-comments/2013Dec/0001.html), [[2]](https://bugzilla.mozilla.org/show_bug.cgi?id=1051509)).
So we use [seck256k1](https://www.npmjs.com/package/secp256k1) library in Node for ECDSA, [elliptic](https://www.npmjs.com/package/elliptic) in Browser for ECDSA and implement ECDH and ECIES manually with the help of native crypto API.
## Usage
With the help of browserify `eccrypto` provides different implementation for Browser and Node.js with the same API. Because WebCryptoAPI defines asynchronous promise-driven API, implementation for Node needs to use promises too.
```js
var eccrypto = require("eccrypto");
```