feat: updated signature method according to the up-to-date implementation

[sugarforever]

No description provided.

[codecov-commenter]

Codecov Report

Merging #175 (9588b1c) into main (c04d787) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #175   +/-   ##
=======================================
  Coverage   54.00%   54.00%           
=======================================
  Files          36       36           
  Lines        2087     2087           
=======================================
  Hits         1127     1127           
  Misses        843      843           
  Partials      117      117           

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[sssion]

sig, err := SignWithPrivky(signKey, meta)
if err != nil {
	return nil, err
}

// Add signature
meta.Signature = sig

Signature Bytes is bytes from envelop's Marshal(). The envelop will use metaSignatureRecord, PrivateKey and bytes from IPLD node(dagjson.Encode)

// Signs metadata using libp2p envelope
func SignWithPrivky(privkey crypto.PrivKey, meta *Metadata) ([]byte, error) {
metaID, err := signMetadata(meta)
if err != nil {
return nil, err
}
envelope, err := record.Seal(&metaSignatureRecord{metaID: metaID}, privkey)
if err != nil {
return nil, err
}
return envelope.Marshal()
}

something is wrong