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Reorganize README sections

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Kagami Hiiragi 2014-12-28 19:16:40 +03:00
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@ -11,32 +11,32 @@ There is currently no any isomorphic ECC library which provides ECDSA, ECDH and
- [ ] ECDH
- [ ] ECIES
Implementation details:
## Implementation details
With the help of browserify `eccrypto` provides different implementations for Browser and Node.js with the same API. Because WebCryptoAPI defines asynchronous promise-driven API, implementation for Node needs to use promises too.
* Use Node.js crypto module/library bindings where possible
* Use WebCryptoAPI where possible
* Promise-driven API
* Only secp256k1 curve, only HMAC-SHA-256 and AES-256-CBC for ECIES
Possible future goals:
### Native crypto API limitations
* Support other curves/KDF/MAC/symmetric encryption schemes
## Native crypto API limitations
### crypto
#### crypto
ECDH only works in Node 0.11+ (see https://github.com/joyent/node/pull/5854), ECDSA is only supported when keys are in PEM format (see https://github.com/joyent/node/issues/6904) and ECIES is not supported at all.
### WebCryptoAPI
#### 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 [currently defines](http://www.w3.org/TR/WebCryptoAPI/#EcKeyGenParams-dictionary) only curves recommended by NIST which means that 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 ECDH and implement ECIES manually with the help of native crypto API.
## Usage
## Possible future goals
With the help of browserify `eccrypto` provides different implementations for Browser and Node.js with the same API. Because WebCryptoAPI defines asynchronous promise-driven API, implementation for Node needs to use promises too.
* Support other curves/KDF/MAC/symmetric encryption schemes
## Usage
```js
var crypto = require("crypto");