/
identities.go
208 lines (166 loc) · 5.08 KB
/
identities.go
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package identityprovider // import "berty.tech/go-ipfs-log/identityprovider"
import (
"encoding/hex"
"github.com/btcsuite/btcd/btcec"
"github.com/libp2p/go-libp2p-core/crypto"
"berty.tech/go-ipfs-log/errmsg"
"berty.tech/go-ipfs-log/keystore"
)
var supportedTypes = map[string]func(*CreateIdentityOptions) Interface{
"orbitdb": NewOrbitDBIdentityProvider,
}
type Identities struct {
keyStore keystore.Interface
}
func getHandlerFor(typeName string) (func(*CreateIdentityOptions) Interface, error) {
if !IsSupported(typeName) {
return nil, errmsg.ErrIdentityProviderNotSupported
}
return supportedTypes[typeName], nil
}
func newIdentities(keyStore keystore.Interface) *Identities {
return &Identities{
keyStore: keyStore,
}
}
func (i *Identities) Sign(identity *Identity, data []byte) ([]byte, error) {
privKey, err := i.keyStore.GetKey(identity.ID)
if err != nil {
return nil, errmsg.ErrKeyNotInKeystore.Wrap(err)
}
sig, err := i.keyStore.Sign(privKey, data)
if err != nil {
return nil, errmsg.ErrSigSign.Wrap(err)
}
return sig, nil
}
// Verify checks a signature.
func (i *Identities) Verify(signature []byte, publicKey crypto.PubKey, data []byte) (bool, error) {
// TODO: Check why this is related to an identity
return publicKey.Verify(data, signature)
}
//type MigrateOptions struct {
// TargetPath string
// TargetID string
//}
func compressedToUncompressedS256Key(pubKeyBytes []byte) ([]byte, error) {
pubKey, err := btcec.ParsePubKey(pubKeyBytes, btcec.S256())
if err != nil {
return nil, errmsg.ErrNotSecp256k1PubKey.Wrap(err)
}
if !btcec.IsCompressedPubKey(pubKeyBytes) {
return pubKeyBytes, nil
}
return pubKey.SerializeUncompressed(), nil
}
// CreateIdentity creates a new Identity.
func (i *Identities) CreateIdentity(options *CreateIdentityOptions) (*Identity, error) {
NewIdentityProvider, err := getHandlerFor(options.Type)
if err != nil {
return nil, errmsg.ErrIdentityProviderNotSupported.Wrap(err)
}
identityProvider := NewIdentityProvider(options)
id, err := identityProvider.GetID(options)
if err != nil {
return nil, errmsg.ErrIdentityUnknown.Wrap(err)
}
// FIXME ?
//if options.Migrate != nil {
// if err := options.Migrate(&MigrateOptions{ TargetPath: i.keyStore.Path, TargetID: id }); err != nil {
// return nil, err
// }
//}
publicKey, idSignature, err := i.signID(id)
if err != nil {
return nil, errmsg.ErrSigSign.Wrap(err)
}
publicKeyBytes, err := publicKey.Raw()
if err != nil {
return nil, errmsg.ErrNotSecp256k1PubKey.Wrap(err)
}
// JS version of IPFS Log expects an uncompressed Secp256k1 key
if publicKey.Type().String() == "Secp256k1" {
publicKeyBytes, err = compressedToUncompressedS256Key(publicKeyBytes)
if err != nil {
return nil, errmsg.ErrNotSecp256k1PubKey.Wrap(err)
}
}
pubKeyIDSignature, err := identityProvider.SignIdentity(append(publicKeyBytes, idSignature...), options.ID)
if err != nil {
return nil, errmsg.ErrIdentityCreationFailed.Wrap(err)
}
return &Identity{
ID: id,
PublicKey: publicKeyBytes,
Signatures: &IdentitySignature{
ID: idSignature,
PublicKey: pubKeyIDSignature,
},
Type: identityProvider.GetType(),
Provider: identityProvider,
}, nil
}
func (i *Identities) signID(id string) (crypto.PubKey, []byte, error) {
privKey, err := i.keyStore.GetKey(id)
if err != nil {
privKey, err = i.keyStore.CreateKey(id)
if err != nil {
return nil, nil, errmsg.ErrSigSign.Wrap(err)
}
}
idSignature, err := i.keyStore.Sign(privKey, []byte(id))
if err != nil {
return nil, nil, errmsg.ErrSigSign.Wrap(err)
}
return privKey.GetPublic(), idSignature, nil
}
// VerifyIdentity checks an identity.
func (i *Identities) VerifyIdentity(identity *Identity) error {
pubKey, err := identity.GetPublicKey()
if err != nil {
return errmsg.ErrPubKeyDeserialization.Wrap(err)
}
idBytes, err := hex.DecodeString(identity.ID)
if err != nil {
return errmsg.ErrIdentityDeserialization.Wrap(err)
}
err = i.keyStore.Verify(
identity.Signatures.ID,
pubKey,
idBytes,
)
if err != nil {
return errmsg.ErrSigNotVerified.Wrap(err)
}
identityProvider, err := getHandlerFor(identity.Type)
if err != nil {
return errmsg.ErrSigNotVerified.Wrap(err)
}
return identityProvider(nil).VerifyIdentity(identity)
}
// CreateIdentity creates a new identity.
func CreateIdentity(options *CreateIdentityOptions) (*Identity, error) {
ks := options.Keystore
if ks == nil {
return nil, errmsg.ErrKeystoreNotDefined
}
identities := newIdentities(ks)
return identities.CreateIdentity(options)
}
// IsSupported checks if an identity type is supported.
func IsSupported(typeName string) bool {
_, ok := supportedTypes[typeName]
return ok
}
// AddIdentityProvider registers an new identity provider.
func AddIdentityProvider(identityProvider func(*CreateIdentityOptions) Interface) error {
if identityProvider == nil {
return errmsg.ErrIdentityProviderNotDefined
}
supportedTypes[identityProvider(nil).GetType()] = identityProvider
return nil
}
// RemoveIdentityProvider unregisters an identity provider.
func RemoveIdentityProvider(name string) {
delete(supportedTypes, name)
}