diff --git a/app/zadanie01.js b/app/zadanie01.js
index 842f75e..11f3769 100644
--- a/app/zadanie01.js
+++ b/app/zadanie01.js
@@ -1,3 +1,13 @@
+const crypto = require('crypto');
 const MY_PWD_HASH = '5dca0fc4e306d92b2077ad85e7c4bd87a3e8648e';
 
-//Twój kod
\ No newline at end of file
+const password = ['??TegoHasła', 'CodersLab', 'Node.js Szyfruje Pliki', 'Zaźółć Gęślą Jaźń', 'Moje Haslo 1@3!', '111#$((@)n', 'Dzisiaj Szyfruje 83'];
+const algorithm = ['sha256', 'sha512', 'md5', 'rmd160'];
+
+password.forEach(pass => {
+  algorithm.forEach(alg => {
+    const hash = crypto.createHmac(alg, pass)
+      .digest('hex');
+    hash === MY_PWD_HASH && console.log('hasło: ', pass, 'algorytm: ', alg);
+  });
+});
diff --git a/app/zadanieDnia1.js b/app/zadanieDnia1.js
index 8c20173..5dfea44 100644
--- a/app/zadanieDnia1.js
+++ b/app/zadanieDnia1.js
@@ -1 +1,12 @@
-//Twój kod
\ No newline at end of file
+const fs = require('fs');
+const crypto = require('crypto');
+
+fs.readFile(process.argv[2], 'utf8', (err, data) => {
+  if (err === null) {
+    const hash = crypto.createHmac('sha256', data)
+        .digest('hex');
+    console.log(hash); 
+  } else {
+    console.log('Błąd podczas odczytu pliku!', err);
+  }
+});
diff --git a/app/zadanieDnia2.js b/app/zadanieDnia2.js
index 85846f4..edc24cd 100644
--- a/app/zadanieDnia2.js
+++ b/app/zadanieDnia2.js
@@ -1,3 +1,22 @@
 const ENCRYPTED_TEXT = '4f9fa8f98650091c4910f5b597773c0a48278cfb001fe4eb3ff47ada85cbf0ed3dc17016b031e1459e6e4d9b001ab6e102c11e834a98dce9530c9668c47b76ee6f09d075d19a38e48b415e067c6ddcfad0d3526c405a4f4f2fb1e7502f303c40';
 
-//Twój kod
\ No newline at end of file
+const crypto = require('crypto');
+
+let pass = '';
+const text = "Pobawmy się jak komputerowy Detektyw".split(' ').forEach(word => {
+  pass += word[0] + word[word.length - 1];
+});
+console.log(pass);
+
+const algorithm = ['aes192', 'aes-256-cbc', 'aes-256-ecb'];
+
+algorithm.forEach(alg => {
+  const decipher = crypto.createDecipher(alg, pass);
+  let decrypted = decipher.update(ENCRYPTED_TEXT, 'hex', 'utf8');
+  try {
+    decrypted += decipher.final('utf8');
+    console.log(decrypted);
+  } catch (err) {
+    console.log('zły algorytm');
+  }
+});