Error: Unexpected data: 0x44

[iamgabrielsoft]

Why getting this error while `

decodeFirst`

Please somebody respond to this....

[hildjj]

Can you give me more information, please? I think your report got its formatting confused a little.

[iamgabrielsoft]

yeah sure...

I was using the cbor package to decode a message but ran into this error ----> Error: Unexpected data: 0x44

[iamgabrielsoft]

return cbor.decodeFirst(payload) .then((obj) => { let type = options.defaultType ? options.defaultType : this.Signtag; if (obj instanceof Tagged) { if (obj.tag !== this.Signtag && obj.tag !== this.Sign1Tag) { throw new Error('Unexpected cbor tag, \'' + obj.tag + '\''); } type = obj.tag; obj = obj.value; }

});``

[hildjj]

Your payload includes multiple cbor data items.

const result = await cbor.decodeFirst('014401020304')

where the first byte (01) is a complete CBOR data item, and decodeFirst by default throws an error in that situation. Try this:

const extendedResult = await cbor.decodeFirst('0144', {extendedResults: true})
// { value: 1, bytes: <Buffer 01>, length: 1, unused: <Buffer 44> }
const result = extendedResult.value

Alternately, it is more efficient to treat the decoder as a stream:

const d = new cbor.Decoder()
d.on('data', value => console.log(value))
d.write(payload)

[hildjj]

cbor.Decoder is a class. cbor.decodeFirst is a function, which is also available as cbor.Decoder.decodeFirst.

[iamgabrielsoft]

Error: Unexpected data: 0x44. Sorry but till getting the error

[hildjj]

Can you please post the code that you're currently running?

[iamgabrielsoft]

  return cbor.decodeFirst(payload)
    .then((obj) => {
      let type = options.defaultType ? options.defaultType : this.Signtag;
      if (obj instanceof Tagged) {
        if (obj.tag !== this.Signtag && obj.tag !== this.Sign1Tag) {
          throw new Error('Unexpected cbor tag, \'' + obj.tag + '\'');
        }
        type = obj.tag;
        obj = obj.value;
      }

      if (!Array.isArray(obj)) {
        throw new Error('Expecting Array');
      }

      if (obj.length !== 4) {
        throw new Error('Expecting Array of lenght 4');
      }

      let [p, u, plaintext, signers] = obj;

      if (type === SignTag && !Array.isArray(signers)) {
        throw new Error('Expecting signature Array');
      }

      p = (!p.length) ? this.EMPTY_BUFFER : cbor.decodeFirstSync(p);
      u = (!u.size) ? this.EMPTY_BUFFER : u;

      let signer = (type === SignTag ? this.getSigner(signers, verifier) : signers);

      if (!signer) {
        throw new Error('Failed to find signer with kid' + verifier.key.kid);
      }

      if (type === SignTag) {
        const externalAAD = verifier.externalAAD || this.EMPTY_BUFFER;
        let [signerP, , sig] = signer;
        signerP = (!signerP.length) ? this.EMPTY_BUFFER : signerP;
        p = (!p.size) ? this.EMPTY_BUFFER : cbor.encode(p);
        const signerPMap = cbor.decode(signerP);
        const alg = signerPMap.get(Common.HeaderParameters.alg);
        const SigStructure = [
          'Signature',
          p,
          signerP,
          externalAAD,
          plaintext
        ];
        return this.doVerify(SigStructure, verifier, alg, sig)
          .then(() => {
            return plaintext;
          });
      } else {
        const externalAAD = verifier.externalAAD || this.EMPTY_BUFFER;

        const alg = this.getCommonParameter(p, u, Common.HeaderParameters.alg);
        p = (!p.size) ? this.EMPTY_BUFFER : cbor.encode(p);
        const SigStructure = [
          'Signature1',
          p,
          externalAAD,
          plaintext
        ];

        return this.doVerify(SigStructure, verifier, alg, signer)
          .then(() => {
            return plaintext;
          });
      }
    });

[iamgabrielsoft]

The paramters am passing are in Buffer

[hildjj]

change the first two lines to:

return cbor.decodeFirst(payload, {extendedResults: true})
    .then(({value: obj}) => {

[iamgabrielsoft]

return cbor.decodeFirst(payload, {extendedResults: true}) .then(({value: obj}) => { console.log("value", obj) })

Till the same

[hildjj]

what is the output of:

return cbor.decodeFirst(payload, {extendedResults: true})
.catch(e => console.log(payload.toString('hex'))

[iamgabrielsoft]

Error: Unexpected data: 0x44 at Decoder._parse (C:\Users\Softbook\Documents\Main Programs\Open Source\cose-js\node_modules\cbor\lib\decoder.js:357:15) at _parse.next () at Decoder.BinaryParseStream._transform (C:\Users\Softbook\Documents\Main Programs\Open Source\cose-js\node_modules\cbor\vendor\binary-parse-stream\index.js:35:31) at Decoder.Transform._read (internal/streams/transform.js:205:10) at Decoder.Transform._write (internal/streams/transform.js:193:12) at writeOrBuffer (internal/streams/writable.js:358:12) at Decoder.Writable.write (internal/streams/writable.js:303:10) at Decoder.Writable.end (internal/streams/writable.js:567:10) at Object.decodeFirst (C:\Users\Softbook\Documents\Main Programs\Open Source\cose-js\node_modules\cbor\lib\decoder.js:282:7) at Sign.verify (C:\Users\Softbook\Documents\Main Programs\Open Source\cose-js\lib\sign.js:177:32)``

[hildjj]

Do you have another place where you're calling decodeFirst than the one you changed?

[iamgabrielsoft]

yeah i do but passing a payload parameter

[iamgabrielsoft]

in another file

[hildjj]

Is your full project available on GitHub or somewhere else where I can see it?

[hildjj]

Or mail me a zip file to the email address in the package.json file for cbor.

[iamgabrielsoft]

https://github.com/iamgabrielsoft/cose-js

[iamgabrielsoft]

sorry this --> https://github.com/iamgabrielsoft/cose-js/blob/master/lib/sign.js#L186

[hildjj]

First off, you're using an ancient version of the cbor package. Please update to the latest.

[iamgabrielsoft]

hahaha😜

[iamgabrielsoft]

to what version??

[iamgabrielsoft]

i installed version + cbor@3.0.3

Till the same error

[hildjj]

Try installing cbor@8.0.0

[hildjj]

I use https://github.com/raineorshine/npm-check-updates to ensure all of my dependencies are up-to-date.

[iamgabrielsoft]

yeah siure...

now getting err UnexpectedDataError: Unexpected data: 0x44

[hildjj]

How are you getting this error to occur? I updated my local copy of your repo to cbor@8, pulled in the git submodules, and all of the tests pass.

[iamgabrielsoft]

wooow....

[iamgabrielsoft]

Probably am runing the example file sepately...

[hildjj]

Also, it looks like you changed one instance of decodeFirst (in encrypt.js), but there are several more. In particular, ensure that you've changed the one on line 188 of sign.js.

[hildjj]

This is likely an issue in how you are calling @erdtman's code. Perhaps you could get his help.