JWE token calculating wrong kid in NodeJs (node-jose)?-CodePudding

I am trying to create a JWE Token using the node-jose library's createEncrypt method. The problem is, I want to set the kid, however when importing the key using the jose.JWK.asKey method, it's automatically calculating the kid and won't let me change/set it. Here is the sample code:

const { JWK, JWE } = require('node-jose');
encrypt = async (raw, format = 'compact', contentAlg = "A128CBC-HS256", alg = "RSA-OAEP-256") => {
    let _publicKey = `-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxO O52a1eAkbYatqpPAk
vhTz5VAdNloWhbmAmwPQl9202VKxU yOCbwZSU8NqwVubHMgnxdycgJw zGslXgz
zHPpmA5evOY2AVjpcE9avKfp523M5gxOaAnQCxat6KxORIJWLSF84EUtrzLIxgle
bvDyhfoHMGVSYiP89UQPTR uu6irFRkdu2zFDPOx2/4XdtyAbJlWdj4Fes0v3CcA
/jDO9EmwVEiySCuagLWnrvHvCV0mCDN167JSVjeeKZy4Q36WyF0VqytxmW mXn m
IfcLlj5vXSXp81pI1Iyg86KZtW3A6dP8QuRlYwHJU7Z m7AeIHtC ol0/eBPYPwk
PQIDAQAB
-----END PUBLIC KEY-----`
    let publicKey = await JWK.asKey(_publicKey, "pem");
    publicKey.kid = "932ea6bb-2623-4dc3-96b1-c4be61e97569";
    console.log(publicKey)
    const buffer = Buffer.from(JSON.stringify(raw))
    const encrypted = await JWE.createEncrypt({ format: format, contentAlg: contentAlg, fields: { alg: alg, iat: (new Date().getTime()), exp: 30000} }, publicKey)
        .update(buffer).final();
    return encrypted;
}
let raw = {
    "mobileNumber": "1234567890",
    "customerId": "000000000",
    "sessionId": "3a600342-a7a3-4c66-bbd3-f67de5d7096f",
};
encrypt(raw).then((data)=> {console.log(data)})

Here is the encrypted JWE Token generated:

eyJhbGciOiJSU0EtT0FFUC0yNTYiLCJpYXQiOjE2NDAyNDU0NzY5ODEsImV4cCI6MzAwMDAsImVuYyI6IkExMjhDQkMtSFMyNTYiLCJraWQiOiI1bUxtdmVHdng0RHVucGlfTnBhajhxZlByRHNDYW9NV29JeWRoM003SzA4In0.SUpO7X0XXbkqQtNGVvLMNo6oGi1GrTzAR1FtXlL8ngg9Uvd91nkLiRqgcmjKBBEE1M330WV_HrUYNs2NVRcXTDcr41fSwvHSu7veK_YDj-m73LoMKlmojeB6GIRUIXIw7oaqgFSOSb_Xgq_zwG9WGa07h2OgOzeFxKNJCvt1J2i_v2Tt61yyet0hdMinT78whDGgf_JW4LUSaXY9wsqsuQSDkKWFLvxHqNmq7nGPLpgEJjm1GPF0slPvdWsARsMEttbPK9VpoMUvMcqy5bWVWSmj2MEGTVw6ua-uFw9fEgyn095wl-s8lEfZFkFaiFN7ps5VwqVV2tihpnYrCVIYAA.jxR4Gw_Gcy9Sexw-wMBKtQ.TzugQZCFgQiolIBc2FAEQ0ZbvNdPFzE2z0m9cFxWQtADEijOCzQjZreVvnsVjHFXdP_w-YcnCbmKXkwalWnFMo7wkjuuJ0fAsTfTOEiBjuIPvMa0k04C97Rc4ZYszzzL7xxwW0RnqoNxiQMkea3H0A.qAqgcg_DLV1vHzb0EIq-9A

If you check this on jwt.io, you can see the kid is already calculated & set. How can I set/change the kid here?

CodePudding user response：

The kid is calculated automatically, when it's not known during the import:

When importing or generating a key that does not have a "kid" defined, a "SHA-256" thumbprint is calculated and used as the "kid".

(see https://github.com/cisco/node-jose#obtaining-a-keys-thumbprint)

But in the call to JWK.asKey, you can pass an additional parameter extras, that sets values for existing fields or contains additional fields for the JWK. For your use case, you can set a kid as a JSON object

let kid = "932ea6bb-2623-4dc3-96b1-c4be61e97569";
let publicKey = await JWK.asKey(_publicKey, "pem", {"kid":kid});
console.log(publicKey.toJSON())

Output:

{
  kty: 'RSA',
  kid: '932ea6bb-2623-4dc3-96b1-c4be61e97569',
  n: 'xO-O52a1eAkbYatqpPAkvhTz5VAdNloWhbmAmwPQl9202VKxU-yOCbwZSU8NqwVubHMgnxdycgJw-zGslXgzzHPpmA5evOY2AVjpcE9avKfp523M5gxOaAnQCxat6KxORIJWLSF84EUtrzLIxglebvDyhfoHMGVSYiP89UQPTR-uu6irFRkdu2zFDPOx2_4XdtyAbJlWdj4Fes0v3CcA_jDO9EmwVEiySCuagLWnrvHvCV0mCDN167JSVjeeKZy4Q36WyF0VqytxmW-mXn-mIfcLlj5vXSXp81pI1Iyg86KZtW3A6dP8QuRlYwHJU7Z-m7AeIHtC-ol0_eBPYPwkPQ',
  e: 'AQAB'
}