PKCS#8 private key ASN1 object for ECC Private key pem

[sureshreddygovindu]

Hi, I'm working on p12 generation for ECC keytype pem and certs.

I'm getting error when I'm passing EC private key to below logic, can you guide me if you have any idea?

const { PEM, ASN1, Class, Tag } = require('@fidm/asn1')
 
// ASN.1 Template https://tools.ietf.org/html/rfc5208
const privateKeyValidator = {
    name: 'PrivateKeyInfo',
    class: Class.UNIVERSAL,
    tag: Tag.SEQUENCE,
    capture: 'privateKeyInfo',
    value: [{
      name: 'PrivateKeyInfo.Version',
      class: Class.UNIVERSAL,
      tag: Tag.INTEGER,
      capture: 'privateKeyVersion'
    }, {
      name: 'PrivateKeyInfo.AlgorithmIdentifier',
      class: Class.UNIVERSAL,
      tag: Tag.SEQUENCE,
      value: [{
        name: 'PrivateKeyAlgorithmIdentifier.algorithm',
        class: Class.UNIVERSAL,
        tag: Tag.OID,
        capture: 'privateKeyOID'
      }]
    }, {
      name: 'PrivateKeyInfo.PrivateKey',
      class: Class.UNIVERSAL,
      tag: Tag.OCTETSTRING,
      capture: 'privateKey'
    }]
  }
 
const rootkey = PEM.parse(fs.readFileSync('ecctestPK.pem'))[0];
console.log(rootkey)
const captures = ASN1.parseDERWithTemplate(rootkey.body, privateKeyValidator);

console.log("******************")
console.log(captures)```

[sureshreddygovindu]

EC 256Primev1 Private key

-----BEGIN EC PRIVATE KEY-----
MHcCAQEEIHlY0FBpEKL+EVEdkDk9x0OxTEO8HJrPxH2ALoB5+xDIoAoGCCqGSM49
AwEHoUQDQgAE6dDBAXOEbl0bq+kR3JAex4SKz8gVcMCopLdxaeYFdAPOMTdifQuB
1+lSQ6Lyl3Vq8zFrKwW6hU9RQ5gS1tjb6w==
-----END EC PRIVATE KEY-----