101 lines
2.4 KiB
Go
101 lines
2.4 KiB
Go
package ed25519
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import (
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"crypto/ed25519"
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"encoding/json"
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"errors"
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"fmt"
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"github.com/INFURA/go-did"
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)
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// Specification: https://w3c.github.io/cg-reports/credentials/CG-FINAL-di-eddsa-2020-20220724/
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const (
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MultibaseCode = uint64(0xed)
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JsonLdContext = "https://w3id.org/security/suites/ed25519-2020/v1"
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)
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var _ did.VerificationMethodSignature = &VerificationKey2020{}
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type VerificationKey2020 struct {
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id string
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pubkey PublicKey
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controller string
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}
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func NewVerificationKey2020(id string, pubkey PublicKey, controller did.DID) (*VerificationKey2020, error) {
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if len(pubkey) != PublicKeySize {
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return nil, errors.New("invalid ed25519 public key size")
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}
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return &VerificationKey2020{
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id: id,
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pubkey: pubkey,
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controller: controller.String(),
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}, nil
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}
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func (v VerificationKey2020) 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: v.ID(),
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Type: v.Type(),
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Controller: v.Controller(),
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PublicKeyMultibase: PublicKeyToMultibase(v.pubkey),
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})
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}
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func (v *VerificationKey2020) 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 != v.Type() {
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return errors.New("invalid type")
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}
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v.id = aux.ID
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if len(v.id) == 0 {
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return errors.New("invalid id")
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}
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v.pubkey, err = PublicKeyFromMultibase(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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v.controller = aux.Controller
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if !did.HasValidSyntax(v.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 (v VerificationKey2020) ID() string {
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return v.id
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}
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func (v VerificationKey2020) Type() string {
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return "Ed25519VerificationKey2020"
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}
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func (v VerificationKey2020) Controller() string {
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return v.controller
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}
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func (v VerificationKey2020) JsonLdContext() string {
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return JsonLdContext
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}
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func (v VerificationKey2020) Verify(data []byte, sig []byte) bool {
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return ed25519.Verify(v.pubkey, data, sig)
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}
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