Q: What is the correct way to load an ECDSA secret key? about elliptic HOT 4 CLOSED

Hello!

From a quick look at the python library it looks like the to_der exports ASN.1 decoded private key using following schema:

SEQ([int(1), octetstring(privkey),cont[0], oid(secp224r1),
          cont[1],bitstring])

Where first bitstring is a private key itself, and the last one is the encoded public key (which you don't really need here).

I believe that you may want to first decode the base64 data with:

const unbase64 = new Buffer(loadedSecretKeyString, 'base64');

Then use some asn1 parser (like asn1.js) to decode it:

const PythonKey = asn1.define(function() {
  this.seq().obj(
    this.key('version').int(),
    this.key('private').octstr(),
    this.key('algorithm').explicit(0).oid(),
    this.key('public').explicit(1).bitstr()
  );
});

const key = PythonKey.decode(unbase64, 'der');

console.log(key.private);

Hopefully this will help!

Thanks,
Fedor.

from elliptic.

@indutny label will better than Q ;)

from elliptic.

@fanatid done, but I don't think it really changes anything :)

from elliptic.

This looks like it will answer my question perfectly. Thank you very much for the detailed response!

from elliptic.