More protocols

protocol/meshcore/identity.go

@@ -0,0 +1,75 @@
+package meshcore
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+
+	"git.maze.io/go/ham/protocol/meshcore/crypto"
+)
+
+type Identity struct {
+	Name       string
+	PrivateKey *crypto.PrivateKey
+}
+
+func (id *Identity) Hash() uint8 {
+	return id.PrivateKey.PublicKey()[0]
+}
+
+type Contact struct {
+	Name      string
+	PublicKey *crypto.PublicKey
+}
+
+func (contact *Contact) Hash() uint8 {
+	return contact.PublicKey.Bytes()[0]
+}
+
+type Group struct {
+	Name   string              `json:"name"`
+	Hash   [32]byte            `json:"hash"`
+	Secret crypto.SharedSecret `json:"-"`
+}
+
+func (group Group) ChannelHash() uint8 {
+	return group.Hash[0]
+}
+
+func (group *Group) MarshalJSON() ([]byte, error) {
+	return json.Marshal(map[string]string{
+		"name": group.Name,
+		"hash": hex.EncodeToString(group.Hash[:]),
+	})
+}
+
+func (group *Group) UnmarshalJSON(b []byte) error {
+	var kv = make(map[string]string)
+	if err := json.Unmarshal(b, &kv); err != nil {
+		return err
+	}
+	group.Name = kv["name"]
+	h, err := hex.DecodeString(kv["hash"])
+	if err != nil {
+		return err
+	}
+	copy(group.Hash[:], h)
+	return nil
+}
+
+func PublicGroup(name string) *Group {
+	h := sha256.Sum256([]byte(name))
+	return &Group{
+		Name:   name,
+		Hash:   sha256.Sum256(h[:16]),
+		Secret: crypto.MakeSharedSecretFromGroupSecret(h[:16]),
+	}
+}
+
+func SecretGroup(name string, key []byte) *Group {
+	return &Group{
+		Name:   name,
+		Hash:   sha256.Sum256(key),
+		Secret: crypto.MakeSharedSecret(key),
+	}
+}