https://github.com/bitcoinjs/bip66

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

bip66 bitcoin

Last synced: 12 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 (almost 9 years ago)
• Default Branch: master
• Last Pushed: 2018-06-19T12:08:59.000Z (about 6 years ago)
• Last Synced: 2024-04-25T16:21:58.859Z (2 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

Lists

• 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

var bip66 = require('bip66')

var r = new Buffer('1ea1fdff81b3a271659df4aad19bc4ef83def389131a36358fe64b245632e777', 'hex')

var s = new Buffer('29e164658be9ce810921bf81d6b86694785a79ea1e52dbfa5105148d1f0bc1', 'hex')

bip66.encode(r, s)

// Buffer <30 43 02 20 1e a1 fd ff 81 b3 a2 71 65 9d f4 aa d1 9b c4 ef 83 de f3 89 13 1a 36 35 8f e6 4b 24 56 32 e7 77 02 1f 29 e1 64 65 8b e9 ce 81 09 21 bf 81 d6 b8 66 94 78 5a 79 ea 1e 52 db fa 51 05 14 8d 1f 0b c1>

var signature = new Buffer('304302201ea1fdff81b3a271659df4aad19bc4ef83def389131a36358fe64b245632e777021f29e164658be9ce810921bf81d6b86694785a79ea1e52dbfa5105148d1f0bc1', 'hex')

bip66.decode(signature)

// => {

//	r: Buffer <1e a1 fd ff 81 b3 a2 71 65 9d f4 aa d1 9b c4 ef 83 de f3 89 13 1a 36 35 8f e6 4b 24 56 32 e7 77>,

//	s: Buffer <29 e1 64 65 8b e9 ce 81 09 21 bf 81 d6 b8 66 94 78 5a 79 ea 1e 52 db fa 51 05 14 8d 1f 0b c1>

// }

```

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)