1 files changed, 18 insertions, 0 deletions
diff --git a/src/main/kotlin/Authenticator.kt b/src/main/kotlin/Authenticator.kt
new file mode 100644
index 0000000..a146840
--- /dev/null
+++ b/src/main/kotlin/Authenticator.kt
@@ -0,0 +1,18 @@
+/**
+ * The Authenticator interface provides methods for authenticating a user over an established protocol connection.
+ */
+interface Authenticator {
+    /**
+     * Authenticate a user identified by the given [username] and whose authenticity is confirmed by the given
+     * [password]. The authentication protocol can read and write data within the underlying connection using [readFun]
+     * and [writeFun].
+     *
+     * @param username The name the user goes by.
+     * @param password The confirmation of the user's authenticity.
+     * @param readFun A function to read incoming data from the underlying connection.
+     * @param writeFun A function to write outgoing data into the underlying connection.
+     * @throws FailedAuthenticationException if the authentication could not be performed. A human-readable reason for
+     *                                       the failure can be provided if necessary.
+     */
+    fun authenticate(username: String, password: String, readFun: () -> Array<UByte>, writeFun: (b: Array<UByte>) -> Unit)
+}
+\ No newline at end of file