From 032e1fa27ff9faa9a5d82624dbfc5fe8a48c339c Mon Sep 17 00:00:00 2001
From: Andrew Guschin <guschin.drew@gmail.com>
Date: Sun, 11 Dec 2022 12:43:48 +0400
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---
 lab5/src/check_window.rs | 90 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 lab5/src/check_window.rs

(limited to 'lab5/src/check_window.rs')

diff --git a/lab5/src/check_window.rs b/lab5/src/check_window.rs
new file mode 100644
index 0000000..216f1dc
--- /dev/null
+++ b/lab5/src/check_window.rs
@@ -0,0 +1,90 @@
+use crate::utils::{adler64, powmod};
+use crate::window_state::WindowState;
+use eframe::egui;
+
+pub struct Window {
+    message: String,
+    signature: String,
+    key: String,
+    correct: Option<bool>,
+    error: Option<String>,
+}
+
+impl Default for Window {
+    fn default() -> Self {
+        Self {
+            message: String::new(),
+            signature: String::new(),
+            key: String::new(),
+            correct: None,
+            error: None,
+        }
+    }
+}
+
+impl Window {
+    fn check(&mut self) {
+        let split = self.key.split(",").collect::<Vec<&str>>();
+        if split.len() != 2 {
+            self.correct = None;
+            self.error = Some("Неверный формат ключа".to_string());
+            return;
+        }
+        let y = match split[0].parse::<u64>() {
+            Ok(num) => num,
+            Err(_) => {
+                self.correct = None;
+                self.error = Some("Не удалось прочитать открытый ключ".to_string());
+                return;
+            }
+        };
+        let p = match split[1].parse::<u64>() {
+            Ok(num) => num,
+            Err(_) => {
+                self.correct = None;
+                self.error = Some("Не удалось прочитать модуль".to_string());
+                return;
+            }
+        };
+
+        let signature = match self.signature.parse::<u64>() {
+            Ok(num) => num,
+            Err(_) => {
+                self.correct = None;
+                self.error = Some("Не удалось прочитать подпись".to_string());
+                return;
+            }
+        };
+
+        let h = adler64(self.message.as_bytes()) % p;
+        self.correct = Some(powmod(signature, h, p) == y);
+    }
+}
+
+impl WindowState for Window {
+    fn get_name(&self) -> &str {
+        "Проверить подпись"
+    }
+
+    fn update(&mut self, ui: &mut egui::Ui) {
+        ui.label("Сообщение:");
+        let resp1 = ui.add(egui::TextEdit::multiline(&mut self.message));
+        ui.label("Подпись:");
+        let resp2 = ui.add(egui::TextEdit::singleline(&mut self.signature));
+        ui.label("Открытый ключ:");
+        let resp3 = ui.add(egui::TextEdit::singleline(&mut self.key));
+        if resp1.changed() || resp2.changed() || resp3.changed() {
+            self.correct = None;
+        }
+
+        if ui.button("Проверить подпись").clicked() {
+            self.check();
+        }
+
+        if let Some(true) = &self.correct {
+            ui.label("Подпись верна");
+        } else if let Some(false) = &self.correct {
+            ui.label("Подпись не соответствует сообщению");
+        }
+    }
+}
-- 
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