Strict DER signature encoding/decoding.
See bip66.
- This module works only with two's complement numbers.
- BIP66 doesn't check that
rorsare fully valid.check/decodedoesn't check thatrorsgreat than 33 bytes or that this number represent valid point on elliptic curve.encodedoesn't check thatr/srepresent valid point on elliptic curve.
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:
/Expected DER (integer|sequence)|(R|S) value (excessively padded|is negative)|(R|S|DER sequence) length is (zero|too short|too long|invalid)/