feat(cybersecurity): auto-commit con 48 cambios

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

functions/cybersecurity/generate_identity.go

@@ -0,0 +1,40 @@
+package cybersecurity
+
+import (
+	"crypto/ed25519"
+	"crypto/rand"
+
+	"golang.org/x/crypto/nacl/box"
+)
+
+// Identity holds a dual keypair for a messaging participant:
+// an Ed25519 keypair for signing and a X25519 keypair for key exchange.
+type Identity struct {
+	SignPub  []byte // Ed25519 public key (32 bytes)
+	SignPriv []byte // Ed25519 private key (64 bytes)
+	KexPub  []byte // X25519 public key (32 bytes)
+	KexPriv []byte // X25519 private key (32 bytes)
+}
+
+// GenerateIdentity creates a new Identity with freshly generated Ed25519 and X25519 keypairs.
+// Ed25519 keys are used for signing; X25519 keys for key exchange (sealed box).
+func GenerateIdentity() (Identity, error) {
+	// Ed25519 keypair for message signing
+	signPub, signPriv, err := ed25519.GenerateKey(rand.Reader)
+	if err != nil {
+		return Identity{}, err
+	}
+
+	// X25519 keypair for key exchange (nacl/box uses Curve25519 internally)
+	kexPub, kexPriv, err := box.GenerateKey(rand.Reader)
+	if err != nil {
+		return Identity{}, err
+	}
+
+	return Identity{
+		SignPub:  []byte(signPub),
+		SignPriv: []byte(signPriv),
+		KexPub:  kexPub[:],
+		KexPriv: kexPriv[:],
+	}, nil
+}