Parsing ECDSA CSR is not working

[sfuser16]

Attaching screenshot to demonstrate this. CSR parsing for ECC is not working. The Public Key Size (Bits) shows < unknown > Please advice.

[microshine]

That example supports RSA mechanisms only.

https://github.com/PeculiarVentures/PKI.js/blob/master/examples/PKCS10ComplexExample/es6.js#L215-L230

We need to update our example script and support ECC mechanisms

[sfuser16]

That example supports RSA mechanisms only.

https://github.com/PeculiarVentures/PKI.js/blob/master/examples/PKCS10ComplexExample/es6.js#L215-L230

We need to update our example script and support ECC mechanisms

Thanks @microshine for your response. I was just trying to add code for that but it doesn't seem to work. Is there somewhere I can refer this and fix? Would appreciate any help.

else if (pkcs10.subjectPublicKeyInfo.algorithm.algorithmId.indexOf("1.2.840.10045.2.1") !== -1) {
      var asn1PublicKey = fromBER(pkcs10.subjectPublicKeyInfo.subjectPublicKey.valueBlock.valueHex);
      var ecPublicKeySimple = new ECPublicKey({
        schema: asn1PublicKey.result
      });
      var modulusView = new Uint8Array(ecPublicKeySimple.modulus.valueBlock.valueHex);
      var modulusBitLength = 0;
      if (modulusView[0] === 0x00) modulusBitLength = (ecPublicKeySimple.modulus.valueBlock.valueHex.byteLength - 1) * 8;else modulusBitLength = ecPublicKeySimple.modulus.valueBlock.valueHex.byteLength * 8;
      publicKeySize = modulusBitLength.toString();
    }

[microshine]

EC key doesn't have modulus. Use algorithm parameters to get information about named curve. Try to use ECPublicKey.namedCurve

For that public key KeyChain shows key size 256bits

[sfuser16]

@microshine I tried the following code to get that value but it doesn't seem to work and fails at creating ecPublicKeySimple. Not sure what wrong am I doing. Appreciate if you could help suggest the fix here.

    var ecPublicKey = fromBER(pkcs10.subjectPublicKeyInfo.algorithm.algorithmParams.valueBeforeDecode);
    var ecPublicKeySimple = new ECPublicKey({
      schema: ecPublicKey.result
    });
    publicKeySize = ecPublicKeySimple.namedCurve;
}

Thank you!!

[MuthuSelviC]

Hi, Anyone, please suggest how to get the named curve of the ECDSA public key?

Thanks in advance.