PKCS11 ECDSA parameters in go module pkcs11

Question

I would like to know how to pass the correct argument values for ECDSA template using go module miekg/pkcs11: this is so far what i got:

    privateKeyTemplate := []*pkcs11.Attribute{
        pkcs11.NewAttribute(pkcs11.CKA_TOKEN, tokenPersistent),
        pkcs11.NewAttribute(pkcs11.CKA_ECDSA_PARAMS, []byte{{/*how to use secp256k1?*/}), 
        pkcs11.NewAttribute(pkcs11.CKA_SIGN, true),
        pkcs11.NewAttribute(pkcs11.CKA_LABEL, label),
        pkcs11.NewAttribute(pkcs11.CKA_SENSITIVE, true),
        pkcs11.NewAttribute(pkcs11.CKA_EXTRACTABLE, true),
    }

Can someone please help me with this?

thanks

EDIT:

the byte array provided by Alexander is correct, however please note that my original question was also misleading. One SHOULD NOT put the ECDSA_PARAMS in the private key template, but ONLY on the public key template.

Answer 1

Check this line (3189) in OpenSC project:

FILL_ATTR(privkey_templ[n_privkey_attr], CKA_EC_PARAMS, gost.param_oid.value, gost.param_oid.len); 

and this one (3199):

FILL_ATTR(privkey_templ[n_privkey_attr], CKA_GOSTR3410_PARAMS, gost.param_oid.value, gost.param_oid.len);

Using my experience with GOST keys I suggest that here must be an encoded OID. In your case it can look like this:

[]byte{ 06, 04, 01, 02, 03, 04 }