102 lines
2.5 KiB
Go
102 lines
2.5 KiB
Go
package x25519vm
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import (
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"encoding/json"
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"errors"
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"fmt"
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"github.com/ucan-wg/go-did-it"
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"github.com/ucan-wg/go-did-it/crypto"
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"github.com/ucan-wg/go-did-it/crypto/x25519"
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)
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// Specification: https://w3c-ccg.github.io/did-method-key/#ed25519-x25519
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const (
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JsonLdContext2020 = "https://w3id.org/security/suites/x25519-2020/v1"
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Type2020 = "X25519KeyAgreementKey2020"
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)
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var _ did.VerificationMethodKeyAgreement = &KeyAgreementKey2020{}
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type KeyAgreementKey2020 struct {
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id string
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pubkey *x25519.PublicKey
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controller string
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}
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func NewKeyAgreementKey2020(id string, pubkey *x25519.PublicKey, controller did.DID) *KeyAgreementKey2020 {
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return &KeyAgreementKey2020{
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id: id,
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pubkey: pubkey,
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controller: controller.String(),
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}
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}
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func (k KeyAgreementKey2020) MarshalJSON() ([]byte, error) {
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return json.Marshal(struct {
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ID string `json:"id"`
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Type string `json:"type"`
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Controller string `json:"controller"`
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PublicKeyMultibase string `json:"publicKeyMultibase"`
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}{
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ID: k.ID(),
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Type: k.Type(),
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Controller: k.Controller(),
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PublicKeyMultibase: k.pubkey.ToPublicKeyMultibase(),
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})
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}
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func (k *KeyAgreementKey2020) UnmarshalJSON(bytes []byte) error {
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aux := struct {
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ID string `json:"id"`
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Type string `json:"type"`
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Controller string `json:"controller"`
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PublicKeyMultibase string `json:"publicKeyMultibase"`
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}{}
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err := json.Unmarshal(bytes, &aux)
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if err != nil {
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return err
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}
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if aux.Type != k.Type() {
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return errors.New("invalid type")
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}
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k.id = aux.ID
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if len(k.id) == 0 {
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return errors.New("invalid id")
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}
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k.pubkey, err = x25519.PublicKeyFromPublicKeyMultibase(aux.PublicKeyMultibase)
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if err != nil {
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return fmt.Errorf("invalid publicKeyMultibase: %w", err)
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}
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k.controller = aux.Controller
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if !did.HasValidDIDSyntax(k.controller) {
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return errors.New("invalid controller")
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}
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return nil
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}
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func (k KeyAgreementKey2020) ID() string {
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return k.id
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}
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func (k KeyAgreementKey2020) Type() string {
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return Type2020
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}
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func (k KeyAgreementKey2020) Controller() string {
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return k.controller
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}
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func (k KeyAgreementKey2020) JsonLdContext() string {
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return JsonLdContext2020
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}
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func (k KeyAgreementKey2020) PrivateKeyIsCompatible(local crypto.PrivateKeyKeyExchange) bool {
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return local.PublicKeyIsCompatible(k.pubkey)
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}
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func (k KeyAgreementKey2020) KeyExchange(local crypto.PrivateKeyKeyExchange) ([]byte, error) {
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return local.KeyExchange(k.pubkey)
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}
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