ox/_cjs/core/internal/webauthn.js

Ethereum Standard Library

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.parseAsn1Signature = parseAsn1Signature;
exports.parseCredentialPublicKey = parseCredentialPublicKey;
const p256_1 = require("@noble/curves/p256");
const Registration = require("../../webauthn/Registration.js");
const PublicKey = require("../PublicKey.js");
function parseAsn1Signature(bytes) {
    const sig = p256_1.p256.Signature.fromDER(bytes).normalizeS();
    return { r: sig.r, s: sig.s };
}
async function parseCredentialPublicKey(response, attestationObject) {
    try {
        const publicKeyBuffer = response.getPublicKey();
        if (!publicKeyBuffer)
            throw new Registration.CreateFailedError();
        const publicKeyBytes = new Uint8Array(publicKeyBuffer);
        const cryptoKey = await crypto.subtle.importKey('spki', new Uint8Array(publicKeyBytes), {
            name: 'ECDSA',
            namedCurve: 'P-256',
            hash: 'SHA-256',
        }, true, ['verify']);
        const publicKey = new Uint8Array(await crypto.subtle.exportKey('raw', cryptoKey));
        return PublicKey.from(publicKey);
    }
    catch (error) {
        if (error.message !== 'Permission denied to access object')
            throw error;
        const data = new Uint8Array(attestationObject ?? response.attestationObject);
        const coordinateLength = 0x20;
        const cborPrefix = 0x58;
        const findStart = (key) => {
            const coordinate = new Uint8Array([key, cborPrefix, coordinateLength]);
            for (let i = 0; i < data.length - coordinate.length; i++)
                if (coordinate.every((byte, j) => data[i + j] === byte))
                    return i + coordinate.length;
            throw new Registration.CreateFailedError();
        };
        const xStart = findStart(0x21);
        const yStart = findStart(0x22);
        return PublicKey.from(new Uint8Array([
            0x04,
            ...data.slice(xStart, xStart + coordinateLength),
            ...data.slice(yStart, yStart + coordinateLength),
        ]));
    }
}
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