@node-dlc/core

<!doctype html> <html lang="en"> <head> <title>Code coverage report for lib/lightning/CommitmentSecret.ts</title> <meta charset="utf-8" /> <link rel="stylesheet" href="../../prettify.css" /> <link rel="stylesheet" href="../../base.css" /> <link rel="shortcut icon" type="image/x-icon" href="../../favicon.png" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <style type='text/css'> .coverage-summary .sorter { background-image: url(../../sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1><a href="../../index.html">All files</a> / <a href="index.html">lib/lightning</a> CommitmentSecret.ts</h1> <div class='clearfix'> <div class='fl pad1y space-right2'> <span class="strong">18.18% </span> <span class="quiet">Statements</span> <span class='fraction'>2/11</span> </div> <div class='fl pad1y space-right2'> <span class="strong">0% </span> <span class="quiet">Branches</span> <span class='fraction'>0/3</span> </div> <div class='fl 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class="cline-any cline-no"> </span> <span class="cline-any cline-neutral"> </span> <span class="cline-any cline-neutral"> </span> <span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import { sha256 } from '@node-dlc/crypto';   export class CommitmentSecret { /** * Generic version of commitment secret generator as defined in * BOLT3. * * This function works by decrementing from bits to 0. If the index * number has the corresponding bit set, it flips the bit in the * secret and hashes it. * * The natural conclusion is the first secret flips every bit and * the last secret flips zero (and is thus the seed). * * This function can be used for generate the local per-commitment * secret based on the per-commitment seed and a commitment index * (in this case it) generates all 48 bits. * * This function can also be used to generate prior commitment * secrets from a newer secret, which acts as a prefix. * * @param base base secret that will be used to derive from * @param i secret at index I to generate * @param bits bits to evaluate, default is 48 */ public <span class="fstat-no" title="function not covered" >static </span>derive(base: Buffer, i: bigint, bits = <span class="branch-0 cbranch-no" title="branch not covered" >48)</span>: Buffer { // intii let p = <span class="cstat-no" title="statement not covered" >Buffer.from(base);</span>   <span class="cstat-no" title="statement not covered" > for (let b = <span class="cstat-no" title="statement not covered" >bits - 1;</span> b >= 0; b--) {</span> <span class="cstat-no" title="statement not covered" > if (i & (BigInt(1) << BigInt(b))) {</span> // flip the specified bit in the specific byte const byteIndex = <span class="cstat-no" title="statement not covered" >Math.floor(b / 8);</span> const bitIndex = <span class="cstat-no" title="statement not covered" >b % 8;</span> <span class="cstat-no" title="statement not covered" > p[byteIndex] = p[byteIndex] ^ (1 << bitIndex);</span> <span class="cstat-no" title="statement not covered" > p = sha256(p);</span> } } <span class="cstat-no" title="statement not covered" > return p;</span> } }  </pre></td></tr></table></pre> <div class='push'></div> </div> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="https://istanbul.js.org/" target="_blank">istanbul</a> at Sun Jul 20 2025 21:18:12 GMT-0700 (Pacific Daylight Saving Time) </div> </div> <script src="../../prettify.js"></script> <script> window.onload = function () { prettyPrint(); }; </script> <script src="../../sorter.js"></script> <script src="../../block-navigation.js"></script> </body> </html>