refactor to mautrix 0.17.x; update deps

vendor/maunium.net/go/mautrix/crypto/olm/pk_goolm.go

@@ -0,0 +1,71 @@
+//go:build goolm
+
+package olm
+
+import (
+	"encoding/json"
+
+	"github.com/tidwall/sjson"
+
+	"maunium.net/go/mautrix/crypto/canonicaljson"
+	"maunium.net/go/mautrix/crypto/goolm/pk"
+	"maunium.net/go/mautrix/id"
+)
+
+// PkSigning stores a key pair for signing messages.
+type PkSigning struct {
+	pk.Signing
+	PublicKey id.Ed25519
+	Seed      []byte
+}
+
+// Clear clears the underlying memory of a PkSigning object.
+func (p *PkSigning) Clear() {
+	p.Signing = pk.Signing{}
+}
+
+// NewPkSigningFromSeed creates a new PkSigning object using the given seed.
+func NewPkSigningFromSeed(seed []byte) (*PkSigning, error) {
+	p := &PkSigning{}
+	signing, err := pk.NewSigningFromSeed(seed)
+	if err != nil {
+		return nil, err
+	}
+	p.Signing = *signing
+	p.Seed = seed
+	p.PublicKey = p.Signing.PublicKey()
+	return p, nil
+}
+
+// NewPkSigning creates a new PkSigning object, containing a key pair for signing messages.
+func NewPkSigning() (*PkSigning, error) {
+	p := &PkSigning{}
+	signing, err := pk.NewSigning()
+	if err != nil {
+		return nil, err
+	}
+	p.Signing = *signing
+	p.Seed = signing.Seed
+	p.PublicKey = p.Signing.PublicKey()
+	return p, err
+}
+
+// Sign creates a signature for the given message using this key.
+func (p *PkSigning) Sign(message []byte) ([]byte, error) {
+	return p.Signing.Sign(message), nil
+}
+
+// SignJSON creates a signature for the given object after encoding it to canonical JSON.
+func (p *PkSigning) SignJSON(obj interface{}) (string, error) {
+	objJSON, err := json.Marshal(obj)
+	if err != nil {
+		return "", err
+	}
+	objJSON, _ = sjson.DeleteBytes(objJSON, "unsigned")
+	objJSON, _ = sjson.DeleteBytes(objJSON, "signatures")
+	signature, err := p.Sign(canonicaljson.CanonicalJSONAssumeValid(objJSON))
+	if err != nil {
+		return "", err
+	}
+	return string(signature), nil
+}