mirror of
https://github.com/idanoo/GoScrobble.git
synced 2024-11-22 16:35:14 +00:00
239 lines
7.0 KiB
Markdown
239 lines
7.0 KiB
Markdown
# Elliptic [](http://travis-ci.org/indutny/elliptic) [](https://coveralls.io/github/indutny/elliptic?branch=master) [](https://codeclimate.com/github/indutny/elliptic)
|
|
|
|
[](https://saucelabs.com/u/gh-indutny-elliptic)
|
|
|
|
Fast elliptic-curve cryptography in a plain javascript implementation.
|
|
|
|
NOTE: Please take a look at http://safecurves.cr.yp.to/ before choosing a curve
|
|
for your cryptography operations.
|
|
|
|
## Incentive
|
|
|
|
ECC is much slower than regular RSA cryptography, the JS implementations are
|
|
even more slower.
|
|
|
|
## Benchmarks
|
|
|
|
```bash
|
|
$ node benchmarks/index.js
|
|
Benchmarking: sign
|
|
elliptic#sign x 262 ops/sec ±0.51% (177 runs sampled)
|
|
eccjs#sign x 55.91 ops/sec ±0.90% (144 runs sampled)
|
|
------------------------
|
|
Fastest is elliptic#sign
|
|
========================
|
|
Benchmarking: verify
|
|
elliptic#verify x 113 ops/sec ±0.50% (166 runs sampled)
|
|
eccjs#verify x 48.56 ops/sec ±0.36% (125 runs sampled)
|
|
------------------------
|
|
Fastest is elliptic#verify
|
|
========================
|
|
Benchmarking: gen
|
|
elliptic#gen x 294 ops/sec ±0.43% (176 runs sampled)
|
|
eccjs#gen x 62.25 ops/sec ±0.63% (129 runs sampled)
|
|
------------------------
|
|
Fastest is elliptic#gen
|
|
========================
|
|
Benchmarking: ecdh
|
|
elliptic#ecdh x 136 ops/sec ±0.85% (156 runs sampled)
|
|
------------------------
|
|
Fastest is elliptic#ecdh
|
|
========================
|
|
```
|
|
|
|
## API
|
|
|
|
### ECDSA
|
|
|
|
```javascript
|
|
var EC = require('elliptic').ec;
|
|
|
|
// Create and initialize EC context
|
|
// (better do it once and reuse it)
|
|
var ec = new EC('secp256k1');
|
|
|
|
// Generate keys
|
|
var key = ec.genKeyPair();
|
|
|
|
// Sign the message's hash (input must be an array, or a hex-string)
|
|
var msgHash = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ];
|
|
var signature = key.sign(msgHash);
|
|
|
|
// Export DER encoded signature in Array
|
|
var derSign = signature.toDER();
|
|
|
|
// Verify signature
|
|
console.log(key.verify(msgHash, derSign));
|
|
|
|
// CHECK WITH NO PRIVATE KEY
|
|
|
|
var pubPoint = key.getPublic();
|
|
var x = pubPoint.getX();
|
|
var y = pubPoint.getY();
|
|
|
|
// Public Key MUST be either:
|
|
// 1) '04' + hex string of x + hex string of y; or
|
|
// 2) object with two hex string properties (x and y); or
|
|
// 3) object with two buffer properties (x and y)
|
|
var pub = pubPoint.encode('hex'); // case 1
|
|
var pub = { x: x.toString('hex'), y: y.toString('hex') }; // case 2
|
|
var pub = { x: x.toBuffer(), y: y.toBuffer() }; // case 3
|
|
var pub = { x: x.toArrayLike(Buffer), y: y.toArrayLike(Buffer) }; // case 3
|
|
|
|
// Import public key
|
|
var key = ec.keyFromPublic(pub, 'hex');
|
|
|
|
// Signature MUST be either:
|
|
// 1) DER-encoded signature as hex-string; or
|
|
// 2) DER-encoded signature as buffer; or
|
|
// 3) object with two hex-string properties (r and s); or
|
|
// 4) object with two buffer properties (r and s)
|
|
|
|
var signature = '3046022100...'; // case 1
|
|
var signature = new Buffer('...'); // case 2
|
|
var signature = { r: 'b1fc...', s: '9c42...' }; // case 3
|
|
|
|
// Verify signature
|
|
console.log(key.verify(msgHash, signature));
|
|
```
|
|
|
|
### EdDSA
|
|
|
|
```javascript
|
|
var EdDSA = require('elliptic').eddsa;
|
|
|
|
// Create and initialize EdDSA context
|
|
// (better do it once and reuse it)
|
|
var ec = new EdDSA('ed25519');
|
|
|
|
// Create key pair from secret
|
|
var key = ec.keyFromSecret('693e3c...'); // hex string, array or Buffer
|
|
|
|
// Sign the message's hash (input must be an array, or a hex-string)
|
|
var msgHash = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ];
|
|
var signature = key.sign(msgHash).toHex();
|
|
|
|
// Verify signature
|
|
console.log(key.verify(msgHash, signature));
|
|
|
|
// CHECK WITH NO PRIVATE KEY
|
|
|
|
// Import public key
|
|
var pub = '0a1af638...';
|
|
var key = ec.keyFromPublic(pub, 'hex');
|
|
|
|
// Verify signature
|
|
var signature = '70bed1...';
|
|
console.log(key.verify(msgHash, signature));
|
|
```
|
|
|
|
### ECDH
|
|
|
|
```javascript
|
|
var EC = require('elliptic').ec;
|
|
var ec = new EC('curve25519');
|
|
|
|
// Generate keys
|
|
var key1 = ec.genKeyPair();
|
|
var key2 = ec.genKeyPair();
|
|
|
|
var shared1 = key1.derive(key2.getPublic());
|
|
var shared2 = key2.derive(key1.getPublic());
|
|
|
|
console.log('Both shared secrets are BN instances');
|
|
console.log(shared1.toString(16));
|
|
console.log(shared2.toString(16));
|
|
```
|
|
|
|
three and more members:
|
|
```javascript
|
|
var EC = require('elliptic').ec;
|
|
var ec = new EC('curve25519');
|
|
|
|
var A = ec.genKeyPair();
|
|
var B = ec.genKeyPair();
|
|
var C = ec.genKeyPair();
|
|
|
|
var AB = A.getPublic().mul(B.getPrivate())
|
|
var BC = B.getPublic().mul(C.getPrivate())
|
|
var CA = C.getPublic().mul(A.getPrivate())
|
|
|
|
var ABC = AB.mul(C.getPrivate())
|
|
var BCA = BC.mul(A.getPrivate())
|
|
var CAB = CA.mul(B.getPrivate())
|
|
|
|
console.log(ABC.getX().toString(16))
|
|
console.log(BCA.getX().toString(16))
|
|
console.log(CAB.getX().toString(16))
|
|
```
|
|
|
|
NOTE: `.derive()` returns a [BN][1] instance.
|
|
|
|
## Supported curves
|
|
|
|
Elliptic.js support following curve types:
|
|
|
|
* Short Weierstrass
|
|
* Montgomery
|
|
* Edwards
|
|
* Twisted Edwards
|
|
|
|
Following curve 'presets' are embedded into the library:
|
|
|
|
* `secp256k1`
|
|
* `p192`
|
|
* `p224`
|
|
* `p256`
|
|
* `p384`
|
|
* `p521`
|
|
* `curve25519`
|
|
* `ed25519`
|
|
|
|
NOTE: That `curve25519` could not be used for ECDSA, use `ed25519` instead.
|
|
|
|
### Implementation details
|
|
|
|
ECDSA is using deterministic `k` value generation as per [RFC6979][0]. Most of
|
|
the curve operations are performed on non-affine coordinates (either projective
|
|
or extended), various windowing techniques are used for different cases.
|
|
|
|
All operations are performed in reduction context using [bn.js][1], hashing is
|
|
provided by [hash.js][2]
|
|
|
|
### Related projects
|
|
|
|
* [eccrypto][3]: isomorphic implementation of ECDSA, ECDH and ECIES for both
|
|
browserify and node (uses `elliptic` for browser and [secp256k1-node][4] for
|
|
node)
|
|
|
|
#### LICENSE
|
|
|
|
This software is licensed under the MIT License.
|
|
|
|
Copyright Fedor Indutny, 2014.
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a
|
|
copy of this software and associated documentation files (the
|
|
"Software"), to deal in the Software without restriction, including
|
|
without limitation the rights to use, copy, modify, merge, publish,
|
|
distribute, sublicense, and/or sell copies of the Software, and to permit
|
|
persons to whom the Software is furnished to do so, subject to the
|
|
following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included
|
|
in all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
|
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
|
|
NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
|
|
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
|
|
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
|
|
USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
[0]: http://tools.ietf.org/html/rfc6979
|
|
[1]: https://github.com/indutny/bn.js
|
|
[2]: https://github.com/indutny/hash.js
|
|
[3]: https://github.com/bitchan/eccrypto
|
|
[4]: https://github.com/wanderer/secp256k1-node
|