108 lines
2.6 KiB
Go
108 lines
2.6 KiB
Go
package x25519vm
|
|
|
|
import (
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
|
|
"github.com/mr-tron/base58"
|
|
|
|
"github.com/INFURA/go-did"
|
|
"github.com/INFURA/go-did/crypto"
|
|
"github.com/INFURA/go-did/crypto/x25519"
|
|
)
|
|
|
|
// Specification: https://github.com/digitalbazaar/x25519-key-agreement-key-2019
|
|
|
|
const (
|
|
JsonLdContext2019 = "https://w3id.org/security/suites/x25519-2019/v1"
|
|
Type2019 = "X25519KeyAgreementKey2019"
|
|
)
|
|
|
|
var _ did.VerificationMethodKeyAgreement = &KeyAgreementKey2019{}
|
|
|
|
type KeyAgreementKey2019 struct {
|
|
id string
|
|
pubkey *x25519.PublicKey
|
|
controller string
|
|
}
|
|
|
|
func NewKeyAgreementKey2019(id string, pubkey *x25519.PublicKey, controller did.DID) *KeyAgreementKey2019 {
|
|
return &KeyAgreementKey2019{
|
|
id: id,
|
|
pubkey: pubkey,
|
|
controller: controller.String(),
|
|
}
|
|
}
|
|
|
|
func (k KeyAgreementKey2019) MarshalJSON() ([]byte, error) {
|
|
return json.Marshal(struct {
|
|
ID string `json:"id"`
|
|
Type string `json:"type"`
|
|
Controller string `json:"controller"`
|
|
PublicKeyBase58 string `json:"publicKeyBase58"`
|
|
}{
|
|
ID: k.ID(),
|
|
Type: k.Type(),
|
|
Controller: k.Controller(),
|
|
PublicKeyBase58: base58.Encode(k.pubkey.ToBytes()),
|
|
})
|
|
}
|
|
|
|
func (k *KeyAgreementKey2019) UnmarshalJSON(bytes []byte) error {
|
|
aux := struct {
|
|
ID string `json:"id"`
|
|
Type string `json:"type"`
|
|
Controller string `json:"controller"`
|
|
PublicKeyBase58 string `json:"publicKeyBase58"`
|
|
}{}
|
|
err := json.Unmarshal(bytes, &aux)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if aux.Type != k.Type() {
|
|
return errors.New("invalid type")
|
|
}
|
|
k.id = aux.ID
|
|
if len(k.id) == 0 {
|
|
return errors.New("invalid id")
|
|
}
|
|
pubBytes, err := base58.Decode(aux.PublicKeyBase58)
|
|
if err != nil {
|
|
return fmt.Errorf("invalid publicKeyBase58: %w", err)
|
|
}
|
|
k.pubkey, err = x25519.PublicKeyFromBytes(pubBytes)
|
|
if err != nil {
|
|
return fmt.Errorf("invalid publicKeyBase58: %w", err)
|
|
}
|
|
k.controller = aux.Controller
|
|
if !did.HasValidDIDSyntax(k.controller) {
|
|
return errors.New("invalid controller")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (k KeyAgreementKey2019) ID() string {
|
|
return k.id
|
|
}
|
|
|
|
func (k KeyAgreementKey2019) Type() string {
|
|
return Type2019
|
|
}
|
|
|
|
func (k KeyAgreementKey2019) Controller() string {
|
|
return k.controller
|
|
}
|
|
|
|
func (k KeyAgreementKey2019) JsonLdContext() string {
|
|
return JsonLdContext2019
|
|
}
|
|
|
|
func (k KeyAgreementKey2019) PrivateKeyIsCompatible(local crypto.PrivateKeyKeyExchange) bool {
|
|
return local.PublicKeyIsCompatible(k.pubkey)
|
|
}
|
|
|
|
func (k KeyAgreementKey2019) KeyExchange(local crypto.PrivateKeyKeyExchange) ([]byte, error) {
|
|
return local.KeyExchange(k.pubkey)
|
|
}
|