https://github.com/bitcoinjs/bip66

Strict DER signatures
https://github.com/bitcoinjs/bip66

bip66 bitcoin

Last synced: 26 days ago
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Strict DER signatures

• Host: GitHub
• URL: https://github.com/bitcoinjs/bip66
• Owner: bitcoinjs
• License: mit
• Created: 2015-08-21T05:11:05.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2018-06-19T12:08:59.000Z (over 6 years ago)
• Last Synced: 2024-04-25T16:21:58.859Z (8 months ago)
• Topics: bip66, bitcoin
• Language: JavaScript
• Size: 28.3 KB
• Stars: 12
• Watchers: 11
• Forks: 11
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-cryptocoinjs - bitcoin

README

        
# bip66

[![NPM Package](https://img.shields.io/npm/v/bip66.svg?style=flat-square)](https://www.npmjs.org/package/bip66)

[![Build Status](https://img.shields.io/travis/bitcoinjs/bip66.svg?branch=master&style=flat-square)](https://travis-ci.org/bitcoinjs/bip66)

[![js-standard-style](https://cdn.rawgit.com/feross/standard/master/badge.svg)](https://github.com/feross/standard)

Strict DER signature encoding/decoding.

See [bip66](https://github.com/bitcoin/bips/blob/master/bip-0066.mediawiki).

- This module **works only with [two's complement](https://en.wikipedia.org/wiki/Two's_complement) numbers**.

- BIP66 doesn't check that `r` or `s` are fully valid.

  - `check`/`decode` doesn't check that `r` or `s` great than 33 bytes or that this number represent valid point on elliptic curve.

  - `encode` doesn't check that `r`/`s` represent valid point on elliptic curve.

## Example

``` javascript

import * as bip66 from"bip66"

const r = Buffer.from('1ea1fdff81b3a271659df4aad19bc4ef83def389131a36358fe64b245632e777', 'hex')

const s = Buffer.from('29e164658be9ce810921bf81d6b86694785a79ea1e52dbfa5105148d1f0bc1', 'hex')

// Buffer or UInt8Array can be passed in to the encode/decode functions

const signature = bip66.encode(r, s)

// Uint8Array(69) [

//    48,  67,   2,  32,  30, 161, 253, 255, 129, 179, 162,

//   113, 101, 157, 244, 170, 209, 155, 196, 239, 131, 222,

//   243, 137,  19,  26,  54,  53, 143, 230,  75,  36,  86,

//    50, 231, 119,   2,  31,  41, 225, 100, 101, 139, 233,

//   206, 129,   9,  33, 191, 129, 214, 184, 102, 148, 120,

//    90, 121, 234,  30,  82, 219, 250,  81,   5,  20, 141,

//    31,  11, 193

// ]

bip66.decode(signature)

// => {

//   r: Uint8Array(32) [

//      30, 161, 253, 255, 129, 179, 162,

//     113, 101, 157, 244, 170, 209, 155,

//     196, 239, 131, 222, 243, 137,  19,

//      26,  54,  53, 143, 230,  75,  36,

//      86,  50, 231, 119

//   ],

//   s: Uint8Array(31) [

//      41, 225, 100, 101, 139, 233, 206, 129,

//       9,  33, 191, 129, 214, 184, 102, 148,

//     120,  90, 121, 234,  30,  82, 219, 250,

//      81,   5,  20, 141,  31,  11, 193

//   ]

// }

```

A catch-all exception regex:

``` javascript

/Expected DER (integer|sequence)|(R|S) value (excessively padded|is negative)|(R|S|DER sequence) length is (zero|too short|too long|invalid)/

```

## LICENSE [MIT](LICENSE)