PHP WebShell
Текущая директория: /opt/BitGoJS/node_modules/bitcoinjs-lib/src
Просмотр файла: bip66.js
'use strict';
// Reference https://github.com/bitcoin/bips/blob/master/bip-0066.mediawiki
// Format: 0x30 [total-length] 0x02 [R-length] [R] 0x02 [S-length] [S]
// NOTE: SIGHASH byte ignored AND restricted, truncate before use
Object.defineProperty(exports, '__esModule', { value: true });
exports.encode = exports.decode = exports.check = void 0;
function check(buffer) {
if (buffer.length < 8) return false;
if (buffer.length > 72) return false;
if (buffer[0] !== 0x30) return false;
if (buffer[1] !== buffer.length - 2) return false;
if (buffer[2] !== 0x02) return false;
const lenR = buffer[3];
if (lenR === 0) return false;
if (5 + lenR >= buffer.length) return false;
if (buffer[4 + lenR] !== 0x02) return false;
const lenS = buffer[5 + lenR];
if (lenS === 0) return false;
if (6 + lenR + lenS !== buffer.length) return false;
if (buffer[4] & 0x80) return false;
if (lenR > 1 && buffer[4] === 0x00 && !(buffer[5] & 0x80)) return false;
if (buffer[lenR + 6] & 0x80) return false;
if (lenS > 1 && buffer[lenR + 6] === 0x00 && !(buffer[lenR + 7] & 0x80))
return false;
return true;
}
exports.check = check;
function decode(buffer) {
if (buffer.length < 8) throw new Error('DER sequence length is too short');
if (buffer.length > 72) throw new Error('DER sequence length is too long');
if (buffer[0] !== 0x30) throw new Error('Expected DER sequence');
if (buffer[1] !== buffer.length - 2)
throw new Error('DER sequence length is invalid');
if (buffer[2] !== 0x02) throw new Error('Expected DER integer');
const lenR = buffer[3];
if (lenR === 0) throw new Error('R length is zero');
if (5 + lenR >= buffer.length) throw new Error('R length is too long');
if (buffer[4 + lenR] !== 0x02) throw new Error('Expected DER integer (2)');
const lenS = buffer[5 + lenR];
if (lenS === 0) throw new Error('S length is zero');
if (6 + lenR + lenS !== buffer.length) throw new Error('S length is invalid');
if (buffer[4] & 0x80) throw new Error('R value is negative');
if (lenR > 1 && buffer[4] === 0x00 && !(buffer[5] & 0x80))
throw new Error('R value excessively padded');
if (buffer[lenR + 6] & 0x80) throw new Error('S value is negative');
if (lenS > 1 && buffer[lenR + 6] === 0x00 && !(buffer[lenR + 7] & 0x80))
throw new Error('S value excessively padded');
// non-BIP66 - extract R, S values
return {
r: buffer.slice(4, 4 + lenR),
s: buffer.slice(6 + lenR),
};
}
exports.decode = decode;
/*
* Expects r and s to be positive DER integers.
*
* The DER format uses the most significant bit as a sign bit (& 0x80).
* If the significant bit is set AND the integer is positive, a 0x00 is prepended.
*
* Examples:
*
* 0 => 0x00
* 1 => 0x01
* -1 => 0xff
* 127 => 0x7f
* -127 => 0x81
* 128 => 0x0080
* -128 => 0x80
* 255 => 0x00ff
* -255 => 0xff01
* 16300 => 0x3fac
* -16300 => 0xc054
* 62300 => 0x00f35c
* -62300 => 0xff0ca4
*/
function encode(r, s) {
const lenR = r.length;
const lenS = s.length;
if (lenR === 0) throw new Error('R length is zero');
if (lenS === 0) throw new Error('S length is zero');
if (lenR > 33) throw new Error('R length is too long');
if (lenS > 33) throw new Error('S length is too long');
if (r[0] & 0x80) throw new Error('R value is negative');
if (s[0] & 0x80) throw new Error('S value is negative');
if (lenR > 1 && r[0] === 0x00 && !(r[1] & 0x80))
throw new Error('R value excessively padded');
if (lenS > 1 && s[0] === 0x00 && !(s[1] & 0x80))
throw new Error('S value excessively padded');
const signature = Buffer.allocUnsafe(6 + lenR + lenS);
// 0x30 [total-length] 0x02 [R-length] [R] 0x02 [S-length] [S]
signature[0] = 0x30;
signature[1] = signature.length - 2;
signature[2] = 0x02;
signature[3] = r.length;
r.copy(signature, 4);
signature[4 + lenR] = 0x02;
signature[5 + lenR] = s.length;
s.copy(signature, 6 + lenR);
return signature;
}
exports.encode = encode;
Выполнить команду
Для локальной разработки. Не используйте в интернете!