@gleif-it/did-webs-ts/dist/esm/utils/document/computeXAndYForSecp256k1.js

did-webs typescript library

import * as secp from '@noble/secp256k1';
import { base64UrlToBytes } from '../conversions/base64UrlToBytes.js';
import { bytesToBase64Url } from '../conversions/bytesToBase64Url.js';
export const computeXAndYForSecp256k1 = (compressedKey) => {
    const bytes = base64UrlToBytes(compressedKey);
    const hexKey = secp.etc.bytesToHex(bytes);
    const point = secp.ProjectivePoint.fromHex(hexKey); // Decompresses the point internally
    const rawX = secp.etc.numberToBytesBE(point.x);
    const rawY = secp.etc.numberToBytesBE(point.y);
    return {
        x: bytesToBase64Url(rawX),
        y: bytesToBase64Url(rawY),
    };
};