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Add workaround for WebCrypto X25519 key export bug on WebKit Linux

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https://bugs.webkit.org/show_bug.cgi?id=289693
This commit is contained in:
larabr 2025-07-09 16:21:33 +02:00
parent d155da23dd
commit b9275642e1
No known key found for this signature in database
GPG Key ID: 2A4BEC40729185DD
1 changed files with 14 additions and 2 deletions
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16
src/crypto/public_key/elliptic/ecdh_x.js
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@ -33,6 +33,12 @@ export async function generate(algo) {
const privateKey = await webCrypto.exportKey('jwk', webCryptoKey.privateKey);
const publicKey = await webCrypto.exportKey('jwk', webCryptoKey.publicKey);
if (privateKey.x !== publicKey.x) { // Weird issue with Webkit on Linux: https://bugs.webkit.org/show_bug.cgi?id=289693
const err = new Error('Unexpected mismatching public point');
err.name = 'NotSupportedError';
throw err;
}
return {
A: new Uint8Array(b64ToUint8Array(publicKey.x)),
k: b64ToUint8Array(privateKey.d)
@ -190,15 +196,21 @@ export async function generateEphemeralEncryptionMaterial(algo, recipientA) {
case enums.publicKey.x25519:
try {
const webCrypto = util.getWebCrypto();
const jwk = publicKeyToJWK(algo, recipientA);
const ephemeralKeyPair = await webCrypto.generateKey('X25519', true, ['deriveKey', 'deriveBits']);
const ephemeralPublicKeyJwt = await webCrypto.exportKey('jwk', ephemeralKeyPair.publicKey);
const ephemeralPrivateKeyJwt = await webCrypto.exportKey('jwk', ephemeralKeyPair.privateKey);
if (ephemeralPrivateKeyJwt.x !== ephemeralPublicKeyJwt.x) { // Weird issue with Webkit on Linux: https://bugs.webkit.org/show_bug.cgi?id=289693
const err = new Error('Unexpected mismatching public point');
err.name = 'NotSupportedError';
throw err;
}
const jwk = publicKeyToJWK(algo, recipientA);
const recipientPublicKey = await webCrypto.importKey('jwk', jwk, 'X25519', false, []);
const sharedSecretBuffer = await webCrypto.deriveBits(
{ name: 'X25519', public: recipientPublicKey },
ephemeralKeyPair.privateKey,
getPayloadSize(algo) * 8 // in bits
);
const ephemeralPublicKeyJwt = await webCrypto.exportKey('jwk', ephemeralKeyPair.publicKey);
return {
sharedSecret: new Uint8Array(sharedSecretBuffer),
ephemeralPublicKey: new Uint8Array(b64ToUint8Array(ephemeralPublicKeyJwt.x))