Cloudflare Developers•2y ago

Importing private key using jose/web crypto api in cloudflare workers returns an undefined CryptoKey

Hi, im trying to import a PKCS8 private key in my worker. I have attempted to do this using both the jose library (panva/jose) and my own implementation using crypto.subtle.importKey(). In both cases, I get an undefined crypto key:

const pk = await importPKCS8(key, "RS256");
console.log(pk);

const pk = await importPKCS8(key, "RS256");
console.log(pk);

CryptoKey {
  usages: undefined,
  algorithm: undefined,
  extractable: undefined,
  type: undefined
}

CryptoKey {
  usages: undefined,
  algorithm: undefined,
  extractable: undefined,
  type: undefined
}

I have read through the docs on cloudflare referencing Web Crypto (https://developers.cloudflare.com/workers/runtime-apis/web-crypto) and I believe this type of operation should be supported. Any help is appreciated.

Web Crypto · Cloudflare Workers docs

The Web Crypto API provides a set of low-level functions for common cryptographic tasks. The Workers Runtime implements the full surface of this API, …

1 Reply

HyperOP•2y ago

Yeah you're right. I tested that behavior with this code:

app.get('/test', async (c) => {
    const encoder = new TextEncoder();
    const secretKeyData = encoder.encode("my secret symmetric key");
    const key = await crypto.subtle.importKey(
        "raw",
        secretKeyData,
        { name: "HMAC", hash: "SHA-256" },
        false,
        ["verify"]
    );
    
    // Returns the undefined crypto key
    console.log(key);
    
    // Returns the correct key
    return c.json(key)
})

app.get('/test', async (c) => {
    const encoder = new TextEncoder();
    const secretKeyData = encoder.encode("my secret symmetric key");
    const key = await crypto.subtle.importKey(
        "raw",
        secretKeyData,
        { name: "HMAC", hash: "SHA-256" },
        false,
        ["verify"]
    );
    
    // Returns the undefined crypto key
    console.log(key);
    
    // Returns the correct key
    return c.json(key)
})

Thanks!

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Importing private key using jose/web crypto api in cloudflare workers returns an undefined CryptoKey