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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,144 @@ | ||
| /* | ||
| * Copyright (C) 2023 Nuts community | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| * | ||
| */ | ||
|
|
||
| package didkey | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto" | ||
| "crypto/ecdsa" | ||
| "crypto/ed25519" | ||
| "crypto/elliptic" | ||
| "crypto/x509" | ||
| "encoding/binary" | ||
| "errors" | ||
| "fmt" | ||
| "github.com/lestrrat-go/jwx/x25519" | ||
| "github.com/multiformats/go-multicodec" | ||
| ssi "github.com/nuts-foundation/go-did" | ||
| "github.com/nuts-foundation/go-did/did" | ||
| "github.com/nuts-foundation/nuts-node/vdr/resolver" | ||
| "github.com/shengdoushi/base58" | ||
| "io" | ||
| ) | ||
|
|
||
| // MethodName is the name of this DID method. | ||
| const MethodName = "key" | ||
|
|
||
| var _ resolver.DIDResolver = &Resolver{} | ||
|
|
||
| var errInvalidPublicKeyLength = errors.New("invalid did:key: invalid public key length") | ||
|
|
||
| // NewResolver creates a new Resolver. | ||
| func NewResolver() *Resolver { | ||
| return &Resolver{} | ||
| } | ||
|
|
||
| type Resolver struct { | ||
| } | ||
|
|
||
| func (r Resolver) Resolve(id did.DID, _ *resolver.ResolveMetadata) (*did.Document, *resolver.DocumentMetadata, error) { | ||
| if id.Method != MethodName { | ||
| return nil, nil, fmt.Errorf("unsupported DID method: %s", id.Method) | ||
| } | ||
| encodedKey := id.ID | ||
| if len(encodedKey) == 0 || encodedKey[0] != 'z' { | ||
| return nil, nil, errors.New("did:key does not start with 'z'") | ||
| } | ||
| mcBytes, err := base58.Decode(encodedKey[1:], base58.BitcoinAlphabet) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("did:key: invalid base58btc: %w", err) | ||
| } | ||
| reader := bytes.NewReader(mcBytes) | ||
| keyType, err := binary.ReadUvarint(reader) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("did:key: invalid multicodec value: %w", err) | ||
| } | ||
| // See https://w3c-ccg.github.io/did-method-key/#signature-method-creation-algorithm | ||
| var key crypto.PublicKey | ||
| mcBytes, _ = io.ReadAll(reader) | ||
| keyLength := len(mcBytes) | ||
|
|
||
| switch multicodec.Code(keyType) { | ||
| case multicodec.Bls12_381G2Pub: | ||
| return nil, nil, errors.New("did:key: bls12381 public keys are not supported") | ||
| case multicodec.X25519Pub: | ||
| if keyLength != 32 { | ||
| return nil, nil, errInvalidPublicKeyLength | ||
| } | ||
| key = x25519.PublicKey(mcBytes) | ||
| case multicodec.Ed25519Pub: | ||
| if keyLength != 32 { | ||
| return nil, nil, errInvalidPublicKeyLength | ||
| } | ||
| key = ed25519.PublicKey(mcBytes) | ||
| case multicodec.Secp256k1Pub: | ||
| // lestrrat/jwk.New() is missing support for secp256k1 | ||
| return nil, nil, errors.New("did:key: secp256k1 public keys are not supported") | ||
| case multicodec.P256Pub: | ||
| if key, err = unmarshalEC(elliptic.P256(), 33, mcBytes); err != nil { | ||
| return nil, nil, err | ||
| } | ||
| case multicodec.P384Pub: | ||
| if key, err = unmarshalEC(elliptic.P384(), 49, mcBytes); err != nil { | ||
| return nil, nil, err | ||
| } | ||
| case multicodec.P521Pub: | ||
| key, _ = unmarshalEC(elliptic.P521(), -1, mcBytes) | ||
| case multicodec.RsaPub: | ||
| rsaKey, err := x509.ParsePKCS1PublicKey(mcBytes) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("did:key: invalid PKCS#1 encoded RSA public key: %w", err) | ||
| } | ||
| // Safe RSA keys must be at least 2048 bits | ||
| if rsaKey.Size() < 256 { | ||
| return nil, nil, errors.New("did:key: RSA public key is too small (must be at least 2048 bits)") | ||
| } | ||
| key = rsaKey | ||
| default: | ||
| return nil, nil, fmt.Errorf("did:key: unsupported public key type: 0x%x", keyType) | ||
| } | ||
|
|
||
| document := did.Document{ | ||
| Context: []ssi.URI{ | ||
| ssi.MustParseURI("https://w3c-ccg.github.io/lds-jws2020/contexts/lds-jws2020-v1.json"), | ||
| did.DIDContextV1URI(), | ||
| }, | ||
| ID: id, | ||
| } | ||
| keyID := id | ||
| keyID.Fragment = id.ID | ||
| vm, err := did.NewVerificationMethod(keyID, ssi.JsonWebKey2020, id, key) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| document.AddAssertionMethod(vm) | ||
| document.AddAuthenticationMethod(vm) | ||
| document.AddKeyAgreement(vm) | ||
| document.AddCapabilityDelegation(vm) | ||
| document.AddCapabilityInvocation(vm) | ||
| return &document, &resolver.DocumentMetadata{}, nil | ||
| } | ||
|
|
||
| func unmarshalEC(curve elliptic.Curve, expectedLen int, pubKeyBytes []byte) (ecdsa.PublicKey, error) { | ||
| if expectedLen != -1 && len(pubKeyBytes) != expectedLen { | ||
| return ecdsa.PublicKey{}, errInvalidPublicKeyLength | ||
| } | ||
| x, y := elliptic.UnmarshalCompressed(curve, pubKeyBytes) | ||
| return ecdsa.PublicKey{Curve: curve, X: x, Y: y}, nil | ||
| } |
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