bip66



Strict DER signature encoding/decoding.

See bip66.

- This module works only with 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