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So I am trying to parse a der format file to extract the public key. I have three algos, RSA, EDDSA and ECDSA. The below code works for RSA but not for EDDSA and ECDSA. I am getting the below error

Error: Cannot read public key. Unknown OID. at push../node_modules/node-forge/lib/rsa.js.pki.publicKeyFromAsn1

Below is the function which I wrote which parses the der to extract the public key. I think this is generic but not sure why it is not working for ecdsa and eddsa.

  const uploadDer = (file: any): boolean => {
    const fileReader = new FileReader();

    fileReader.onload = () => {
      const arrayBuffer = fileReader.result as ArrayBuffer;

      try {
        const uint8Array = new Uint8Array(arrayBuffer);
        const byteBuffer = forge.util.createBuffer(uint8Array);
        const asnObject = forge.asn1.fromDer(byteBuffer);
        const publicKeyObject = forge.pki.publicKeyFromAsn1(asnObject);
        const fileContent = forge.pki.publicKeyToPem(publicKeyObject);
        console.log('fileContent--> ', fileContent);

        const pemSections = forge.pem.decode(fileContent);
        const lastPemSection = pemSections[pemSections.length - 1];
        const publicKey = forge.util.encode64(lastPemSection.body);
        props.change('publicKey', publicKey);
      } catch (error) {
        props.change('publicKey', '');

        return dispatch(
          showNotification({
            id: uuidv1(),
            title: 'statusTitle',
            message: 'uploadKeypairFailedMessage',
            type: NotificationTypes.error,
          })
        );
      }
    };

    fileReader.onerror = (error) => {
      console.error('onerror', error);
    };

    fileReader.readAsArrayBuffer(file);

    return false;
  };
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  • 1
    ...Extract public key... from what? If you mean a private PEM key: There is information missing about the format. Private RSA keys can be in PKCS#8 or PKCS#1 format, private EC keys in PKCS#8 or SEC1. In addition, private EC keys do not necessarily have to contain the public key component. In this case, the public key must be calculated. Commented Jan 15 at 8:26
  • Perhaps it is best if you post non-productive sample keys (for ECDSA and EdDSA, since RSA seems to work). Commented Jan 15 at 8:30
  • the public key that i am talking about is part of the der file which is in binary. I need to decode it and extract it out. for encoding when the algo used was RSA, those der files can be parsed. for encoding done with eddsa and ecdsa, I am unable to parse those files. Commented Jan 15 at 9:15
  • 1
    ...the public key...is part of the der file which is in binary... unfortunately does not answer any of the ambiguities. Without knowing what the public ECDSA/EdDSA key is to be extracted from, this question can probably not be answered. Commented Jan 15 at 9:30
  • As a side note: If you are using NodeJS, then NodeJS' crypto module might be a better option as it supports import/export of PEM keys for various algorithms. Commented Jan 15 at 9:41
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