dpay-libcrypto

dpay-libcrypto
=========

A small vendoring wrapper for sjcl with support for
hashes and encodings required by the dPay platform.

Usage

If you are using Webpack or Browserify, you must ensure that Node's built-in crypto package
is excluded from your builds.

Otherwise, just
``sh
$ yarn install dpay-libcrypto
`

API

`
> crypto = require('dpay-libcrypto');
`

$3

Hashes the content of an ArrayBuffer using SHA-256.

`
> shaHash = crypto.sha256(new Uint8Array().buffer)
ArrayBuffer { byteLength: 32 }
> crypto.hexify(shaHash)
'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855'
`

$3

Hashes the content of an ArrayBuffer using RIPEMD-160.

`
> ripemdHash = crypto.ripemd160(new Uint8Array().buffer)
ArrayBuffer { byteLength: 20 }
> crypto.hexify(ripemdHash)
'9c1185a5c5e9fc54612808977ee8f548b2258d31'
`

$3

Provides operations over dPay secp256k1-based ECC private keys.
`
> secretKey = crypto.PrivateKey.from('5JCDRqLdyX4W7tscyzyxav8EaqABSVAWLvfi7rdqMKJneqqwQGt')
PrivateKey { getPublicKey: [Function], sign: [Function] }
> secretKey.getPublicKey().toString()
'DWB5pZ15FDVAvNKW3saTJchWmSSmYtEvA6aKiXwDtCq2JRZV9KtR9'
> secretSig = secretKey.sign(new Uint8Array(32).buffer)
ArrayBuffer { byteLength: 65 }
> crypto.hexify(secretSig)
'20387d5f9ae215a64065fde2a9d4f7be83d3480b7cc89f7c01488042da348845408909e9d4f1d66466c53f0007c771a73bf2883d8d5ab4735b5b4316091361442c'
`

$3

Provides operations over dPay secp256k1-based ECC public keys.
`
> publicKey = crypto.PublicKey.from('DWB5SKxjN1YdrFLgoPcp9KteUmNVdgE8DpTPC9sF6jbjVqP9d2Utq')
...
> publicKey.verify(new Uint8Array(32).buffer, secretSig)
true
> PublicKey.recover(someHash, someSig)
...
`

$3

Generates a new pair of keys in dPay WIF format using cryptographically secure
random number generation.
`
> crypto.generateKeys()
{
private: "5JCDRqLdyX4W7tscyzyxav8EaqABSVAWLvfi7rdqMKJneqqwQGt",
public: "DWB5pZ15FDVAvNKW3saTJchWmSSmYtEvA6aKiXwDtCq2JRZV9KtR9"
}
`

$3

Given a dPay account name and password, regenerates the derived owner, posting,
active, and memo keys.
`
> crypto.keysFromPassword('username', 'password')
{ owner:
{ private: '5JCDRqLdyX4W7tscyzyxav8EaqABSVAWLvfi7rdqMKJneqqwQGt',
public: 'DWB5pZ15FDVAvNKW3saTJchWmSSmYtEvA6aKiXwDtCq2JRZV9KtR9' },
memo:
{ private: '5JSmQQJXH5ZrSW3KJSTUPFJy7SuLeDiY3bW6vB1McamxzJQFhwD',
public: 'DWB5nwJgD9jmkAdTXuiz3jqrkw3om95gCapZo4e4Bcp3qzyiedwCn' },
posting:
{ private: '5HsoxWiHRRyx6oSxKj32HDqDMzSGhs79zLZopDc7nMcjMbcPp5E',
public: 'DWB6gZmazY23TEMkxmPpnmvbAgWFAzwtaSDbhSUdmpTXzoJJLPFH4' },
active:
{ private: '5JamTPvZyQsHf8c2pbN92F1gUY3sJkpW3ZJFzdmfbAJPAXT5aw3',
public: 'DWB5SKxjN1YdrFLgoPcp9KteUmNVdgE8DpTPC9sF6jbjVqP9d2Utq' } }
``

Requirements

dpay-libcrypto is written in Javascript as specified by
ECMA-262, version 5.1.
Other than its vendored copy of sjcl, it has no dependencies and never will.

dpay-libcrypto explicitly supports the following environments without polyfills:
- Node.js versions 4 and up
- Microsoft Edge (all versions)
- Safari for macOS versions 7.1+
- Safari for iOS versions 8+
- Firefox, Chrome, and Opera versions 30+

dpay-libcrypto explicitly does not support the following environments:
- Opera Mini
- Android Browser (i.e., the non-Chromium versions)
- Microsoft Internet Explorer versions <10

Contributing

Contributions must conform to the following rules:
- They must pass formatting and linting and the existing automated test suite must pass.
- They must add test coverage for new code.
- They must not introduce any new dependencies.
- They must support the environments listed above without the use of polyfills.