nimona/go-nimona

package nimona

import (
    "fmt"

    "github.com/oasisprotocol/curve25519-voi/primitives/ed25519"
)

type Signature struct {
    Signer PeerKey `nimona:"signer"`
    X      []byte  `nimona:"x"`
}

func NewDocumentSignature(sk PrivateKey, hash DocumentHash) *Signature {
    sig, err := sk.Sign(hash[:], &ed25519.Options{})
    if err != nil {
        panic(fmt.Errorf("error signing document: %w", err))
    }

    return sig
}

func VerifySignature(sig *Signature, hash DocumentHash) error {
    ok := ed25519.Verify(ed25519.PublicKey(sig.Signer.PublicKey), hash[:], sig.X)
    if !ok {
        return fmt.Errorf("error verifying document signature")
    }

    return nil
}