diff --git a/auth.go b/auth.go
new file mode 100644
index 0000000..6a8db8c
--- /dev/null
+++ b/auth.go
@@ -0,0 +1,14 @@
+package main
+
+import (
+	"crypto/rsa"
+)
+
+type Auth struct {
+	Nick string
+	Key  *rsa.PublicKey
+}
+
+func (a *Auth) Kind() string {
+	return "auth"
+}
diff --git a/client.go b/client.go
index cb504da..c2e1237 100644
--- a/client.go
+++ b/client.go
@@ -18,15 +18,6 @@ import (
 	"unicode"
 )
 
-type Auth struct {
-	Nick string
-	Key  *rsa.PublicKey
-}
-
-func (a *Auth) Kind() string {
-	return "auth"
-}
-
 type ReadWriter struct {
 	io.Reader
 	io.Writer