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initial import, barely working

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Michael Muré
2025-03-12 14:13:31 +01:00
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The contents of this repository are Copyright (c) corresponding authors and
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([...4tr2kfsq](https://dweb.link/ipfs/bafkreiankqxazcae4onkp436wag2lj3ccso4nawxqkkfckd6cg4tr2kfsq))
- MIT Software License: https://opensource.org/licenses/MIT
([...vljevcba](https://dweb.link/ipfs/bafkreiepofszg4gfe2gzuhojmksgemsub2h4uy2gewdnr35kswvljevcba))
You may not use the contents of this repository except in compliance
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<!--- SPDX-License-Identifier: Apache-2.0 OR MIT -->
`SPDX-License-Identifier: Apache-2.0 OR MIT`
Verbatim copies of both licenses are included below:
<details><summary>Apache-2.0 Software License</summary>
```
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</details>
<details><summary>MIT Software License</summary>
```
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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```
</details>

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DID spec concepts:
![DID spec concepts](resources/did_brief_architecture_overview.svg)
`go-did` concepts:
![`go-did` concepts](resources/go-did%20concepts.png)

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did-key/document.go Normal file
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package did_key
import (
"net/url"
"github.com/INFURA/go-did"
)
var _ did.Document = &document{}
type document struct {
id did.DID
verification did.VerificationMethod
}
func (d document) MarshalJSON() ([]byte, error) {
// TODO implement me
panic("implement me")
}
func (d document) ID() did.DID {
return d.id
}
func (d document) Controller() did.DID {
// no external controller possible for did:key
return d.id
}
func (d document) AlsoKnownAs() []url.URL {
return nil
}
func (d document) VerificationMethods() map[string]did.VerificationMethod {
return map[string]did.VerificationMethod{
d.verification.ID(): d.verification,
}
}
func (d document) Authentication() []did.VerificationMethod {
return []did.VerificationMethod{d.verification}
}
func (d document) Assertion() []did.VerificationMethod {
return []did.VerificationMethod{d.verification}
}
func (d document) KeyAgreement() []did.VerificationMethod {
return []did.VerificationMethod{d.verification}
}
func (d document) CapabilityInvocation() []did.VerificationMethod {
return []did.VerificationMethod{d.verification}
}
func (d document) CapabilityDelegation() []did.VerificationMethod {
return []did.VerificationMethod{d.verification}
}

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package did_key
import (
"fmt"
"net/url"
mbase "github.com/multiformats/go-multibase"
varint "github.com/multiformats/go-varint"
"github.com/INFURA/go-did"
)
type multicodecCode uint64
// Signature algorithms from the [did:key specification]
//
// [did:key specification]: https://w3c-ccg.github.io/did-method-key/#signature-method-creation-algorithm
const (
X25519 multicodecCode = 0xec
Ed25519 multicodecCode = 0xed
P256 multicodecCode = 0x1200
P384 multicodecCode = 0x1201
P521 multicodecCode = 0x1202
Secp256k1 multicodecCode = 0xe7
RSA multicodecCode = 0x1205
)
func Decode(identifier string) (did.DID, error) {
// baseCodec, bytes, err := mbase.Decode(identifier)
_, bytes, err := mbase.Decode(identifier)
if err != nil {
return nil, fmt.Errorf("%w: %w", did.ErrInvalidDid, err)
}
// if baseCodec != mbase.Base58BTC {
// return nil, fmt.Errorf("%w: not Base58BTC encoded", did.ErrInvalidDid)
// }
code, _, err := varint.FromUvarint(bytes)
if err != nil {
return nil, fmt.Errorf("%w: %w", did.ErrInvalidDid, err)
}
switch multicodecCode(code) {
case Ed25519, P256, Secp256k1, RSA:
return DidKey{bytes: string(bytes), code: multicodecCode(code)}, nil
}
return nil, fmt.Errorf("%w: unsupported did:key multicodec: 0x%x", did.ErrInvalidDid, code)
}
func init() {
did.RegisterMethod("key", Decode)
}
var _ did.DID = &DidKey{}
type DidKey struct {
// TODO: store a verification method instead
code multicodecCode
bytes string // as string instead of []byte to allow the == operator
}
func (d DidKey) Method() string {
return "key"
}
func (d DidKey) Path() string {
return ""
}
func (d DidKey) Query() url.Values {
return nil
}
func (d DidKey) Fragment() string {
return ""
}
func (d DidKey) Document() (did.Document, error) {
// TODO implement me
panic("implement me")
}
func (d DidKey) String() string {
key, _ := mbase.Encode(mbase.Base58BTC, []byte(d.bytes))
return "did:key:" + key
}

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package did_key_test
import (
"testing"
"github.com/stretchr/testify/require"
"github.com/INFURA/go-did"
_ "github.com/INFURA/go-did/did-key"
)
func TestParseDIDKey(t *testing.T) {
str := "did:key:z6Mkod5Jr3yd5SC7UDueqK4dAAw5xYJYjksy722tA9Boxc4z"
d, err := did.Parse(str)
require.NoError(t, err)
require.Equal(t, str, d.String())
}
func TestMustParseDIDKey(t *testing.T) {
str := "did:key:z6Mkod5Jr3yd5SC7UDueqK4dAAw5xYJYjksy722tA9Boxc4z"
require.NotPanics(t, func() {
d := did.MustParse(str)
require.Equal(t, str, d.String())
})
str = "did:key:z7Mkod5Jr3yd5SC7UDueqK4dAAw5xYJYjksy722tA9Boxc4z"
require.Panics(t, func() {
did.MustParse(str)
})
}
func TestEquivalence(t *testing.T) {
did0A, err := did.Parse("did:key:z6Mkod5Jr3yd5SC7UDueqK4dAAw5xYJYjksy722tA9Boxc4z")
require.NoError(t, err)
did0B, err := did.Parse("did:key:z6Mkod5Jr3yd5SC7UDueqK4dAAw5xYJYjksy722tA9Boxc4z")
require.NoError(t, err)
did1, err := did.Parse("did:key:z6MkhaXgBZDvotDkL5257faiztiGiC2QtKLGpbnnEGta2doK")
require.NoError(t, err)
require.True(t, did0A == did0B)
require.False(t, did0A == did1)
}

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package did
import (
"fmt"
"strings"
"sync"
)
// Decoder is a function decoding an identifier ("foo" in "did:example:foo") into a DID.
type Decoder func(identifier string) (DID, error)
var (
decodersMu sync.RWMutex
decoders = map[string]Decoder{}
)
// RegisterMethod registers a DID decoder for a given DID method..
// Method must be the DID method (for example "key" in did:key).
func RegisterMethod(method string, decoder Decoder) {
decodersMu.Lock()
defer decodersMu.Unlock()
if !checkMethod(method) {
panic("invalid method")
}
if decoders[method] != nil {
panic("did decoder already registered")
}
decoders[method] = decoder
}
// Parse returns the DID from the string representation or an error if
// the prefix and method are incorrect, if an unknown encryption algorithm
// is specified or if the method-specific-identifier's bytes don't
// represent a public key for the specified encryption algorithm.
func Parse(str string) (DID, error) {
decodersMu.RLock()
defer decodersMu.RUnlock()
if !strings.HasPrefix(str, "did:") {
return nil, fmt.Errorf("%w: must start with \"did:\"", ErrInvalidDid)
}
method, identifier, ok := strings.Cut(str[len("did:"):], ":")
if !ok {
return nil, fmt.Errorf("%w: must have a method and an identifier", ErrInvalidDid)
}
if !checkIdentifier(identifier) {
return nil, fmt.Errorf("%w: invalid identifier characters", ErrInvalidDid)
}
decoder, ok := decoders[method]
if !ok {
return nil, fmt.Errorf("%w: %s", ErrMethodNotSupported, method)
}
return decoder(identifier)
}
// MustParse is like Parse but panics instead of returning an error.
func MustParse(str string) DID {
did, err := Parse(str)
if err != nil {
panic(err)
}
return did
}
func checkMethod(method string) bool {
if len(method) == 0 {
return false
}
for _, char := range method {
isAlpha := 'a' <= char && char <= 'z'
isDigit := '0' <= char && char <= '9'
if !isAlpha && !isDigit {
return false
}
}
return true
}
func checkIdentifier(identifier string) bool {
if len(identifier) == 0 {
return false
}
// TODO
// for _, char := range identifier {
//
// }
return true
}

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errors.go Normal file
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package did
import "fmt"
// Decoder errors
var (
// ErrInvalidDid indicates that the DID supplied to the DID resolution function does not conform to valid syntax.
ErrInvalidDid = fmt.Errorf("invalid DID")
// ErrMethodNotSupported indicates that the DID method is not supported, or that the corresponding decoder
// has not been registered properly.
ErrMethodNotSupported = fmt.Errorf("DID method not supported")
)
// Resolver errors
var (
// ErrNotFound indicates that the DID resolver was unable to find the DID document for the given DID.
ErrNotFound = fmt.Errorf("did not found")
)

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module github.com/INFURA/go-did
go 1.23
require (
github.com/multiformats/go-multibase v0.2.0
github.com/multiformats/go-varint v0.0.7
github.com/stretchr/testify v1.10.0
)
require (
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/mr-tron/base58 v1.1.0 // indirect
github.com/multiformats/go-base32 v0.0.3 // indirect
github.com/multiformats/go-base36 v0.1.0 // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
)

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github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/mr-tron/base58 v1.1.0 h1:Y51FGVJ91WBqCEabAi5OPUz38eAx8DakuAm5svLcsfQ=
github.com/mr-tron/base58 v1.1.0/go.mod h1:xcD2VGqlgYjBdcBLw+TuYLr8afG+Hj8g2eTVqeSzSU8=
github.com/multiformats/go-base32 v0.0.3 h1:tw5+NhuwaOjJCC5Pp82QuXbrmLzWg7uxlMFp8Nq/kkI=
github.com/multiformats/go-base32 v0.0.3/go.mod h1:pLiuGC8y0QR3Ue4Zug5UzK9LjgbkL8NSQj0zQ5Nz/AA=
github.com/multiformats/go-base36 v0.1.0 h1:JR6TyF7JjGd3m6FbLU2cOxhC0Li8z8dLNGQ89tUg4F4=
github.com/multiformats/go-base36 v0.1.0/go.mod h1:kFGE83c6s80PklsHO9sRn2NCoffoRdUUOENyW/Vv6sM=
github.com/multiformats/go-multibase v0.2.0 h1:isdYCVLvksgWlMW9OZRYJEa9pZETFivncJHmHnnd87g=
github.com/multiformats/go-multibase v0.2.0/go.mod h1:bFBZX4lKCA/2lyOFSAoKH5SS6oPyjtnzK/XTFDPkNuk=
github.com/multiformats/go-varint v0.0.7 h1:sWSGR+f/eu5ABZA2ZpYKBILXTTs9JWpdEM/nEGOHFS8=
github.com/multiformats/go-varint v0.0.7/go.mod h1:r8PUYw/fD/SjBCiKOoDlGF6QawOELpZAu9eioSos/OU=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

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interfaces.go Normal file
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package did
import (
"encoding/json"
"net/url"
)
type DID interface { // --> implementation for each DID type: key, pkh ..
Method() string
Path() string
Query() url.Values
Fragment() string
Document() (Document, error)
String() string // return the full DID URL, with path, query, fragment
}
type Document interface { // --> compact implementation, get serialized into json only if necessary
json.Marshaler
// ID is the identifier of the Document, which is the DID itself.
ID() DID
// Controller is the DID that is authorized to make changes to the Document. It's often the same as ID.
Controller() DID
// AlsoKnownAs returns an optional set of URL describing ???TODO
AlsoKnownAs() []url.URL
// VerificationMethods returns all the VerificationMethod known in the document.
VerificationMethods() map[string]VerificationMethod
// Authentication defines how the DID is able to authenticate, for purposes such as logging into a website
// or engaging in any sort of challenge-response protocol.
Authentication() []VerificationMethod
// Assertion specifies how the DID subject is expected to express claims, such as for the purposes of issuing
// a Verifiable Credential.
// See https://www.w3.org/TR/vc-data-model/
Assertion() []VerificationMethod
// KeyAgreement specifies how an entity can generate encryption material in order to transmit confidential
// information intended for the DID subject, such as for the purposes of establishing a secure communication channel
// with the recipient.
KeyAgreement() []VerificationMethod
// CapabilityInvocation specifies a verification method that might be used by the DID subject to invoke a
// cryptographic capability, such as the authorization to update the DID Document.
CapabilityInvocation() []VerificationMethod
// CapabilityDelegation specifies a mechanism that might be used by the DID subject to delegate a cryptographic
// capability to another party, such as delegating the authority to access a specific HTTP API to a subordinate.
CapabilityDelegation() []VerificationMethod
// TODO: Service
// https://www.w3.org/TR/did-extensions-properties/#service-types
}
type VerificationMethod interface { // --> implementation for each method
json.Marshaler
json.Unmarshaler
// ID is a string identifier for the VerificationMethod
ID() string
// Type is a string identifier of a verification method.
// See https://www.w3.org/TR/did-extensions-properties/#verification-method-types
Type() string
// ???? TODO
Controller() DID
// Verify that 'sig' is the signed hash of 'data'
Verify(data []byte, sig []byte) bool
}

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verifications/Ed25519/VerificationKey2020.go Normal file
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package Ed25519
import (
"crypto/ed25519"
"encoding/json"
"errors"
"github.com/INFURA/go-did"
)
var _ did.VerificationMethod = &VerificationKey2020{}
type VerificationKey2020 struct {
id string
pubkey ed25519.PublicKey
controller did.DID
}
func NewVerificationKey2020(id string, pubkey []byte, controller did.DID) (*VerificationKey2020, error) {
if len(pubkey) != ed25519.PublicKeySize {
return nil, errors.New("invalid ed25519 public key size")
}
return &VerificationKey2020{
id: id,
pubkey: pubkey,
controller: controller,
}, nil
}
func (v VerificationKey2020) MarshalJSON() ([]byte, error) {
return json.Marshal(struct {
ID string `json:"id"`
Type string `json:"type"`
Controller string `json:"controller"`
PublicKeyMultibase string `json:"publicKeyMultibase"`
}{
ID: v.ID(),
Type: v.Type(),
Controller: v.Controller().String(),
PublicKeyMultibase: v,
})
/*
{
"id": "did:key:z6MkhaXgBZDvotDkL5257faiztiGiC2QtKLGpbnnEGta2doK#z6MkhaXgBZDvotDkL5257faiztiGiC2QtKLGpbnnEGta2doK",
"type": "Ed25519VerificationKey2020",
"controller": "did:key:z6MkhaXgBZDvotDkL5257faiztiGiC2QtKLGpbnnEGta2doK",
"publicKeyMultibase": "z6MkhaXgBZDvotDkL5257faiztiGiC2QtKLGpbnnEGta2doK"
}
*/
}
func (v VerificationKey2020) UnmarshalJSON(bytes []byte) error {
// TODO implement me
panic("implement me")
}
func (v VerificationKey2020) ID() string {
return v.id
}
func (v VerificationKey2020) Type() string {
return "Ed25519VerificationKey2020"
}
func (v VerificationKey2020) Controller() did.DID {
return v.controller
}
func (v VerificationKey2020) Verify(data []byte, sig []byte) bool {
return ed25519.Verify(v.pubkey, data, sig)
}