diff --git a/app/zadanie01.js b/app/zadanie01.js
index 842f75e..fce1392 100644
--- a/app/zadanie01.js
+++ b/app/zadanie01.js
@@ -1,3 +1,24 @@
+//Twój kod
+
+const crypto = require('crypto');
+
 const MY_PWD_HASH = '5dca0fc4e306d92b2077ad85e7c4bd87a3e8648e';
+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( passwordElem => {
+    algorithm.forEach( algorithmElem => {
+        const hash = crypto.createHmac(algorithmElem, passwordElem)
+            .digest('hex');
+        hash === MY_PWD_HASH ? console.log(`password: ${passwordElem}; algorithm: ${algorithmElem}`) : null;
+    });
+});
 
-//Twój kod
\ No newline at end of file
diff --git a/app/zadanieDnia1.js b/app/zadanieDnia1.js
index 8c20173..851993f 100644
--- a/app/zadanieDnia1.js
+++ b/app/zadanieDnia1.js
@@ -1 +1,16 @@
-//Twój kod
\ No newline at end of file
+//Twój kod
+
+const fs = require('fs');
+const crypto = require('crypto');
+
+const file = process.argv[2];
+
+fs.readFile(file, 'utf8', (err, data) => {
+    if (err === null){
+        const hash = crypto.createHmac('sha256', data)
+            .digest('hex');
+        console.log(hash); // d5b1c451f5a44e4fcce7af164b6470f4ebd06b16c8b65adda696c6c7f328289b
+    } else {
+        console.log('Błąd podczas odczytu pliku!', err);
+    }
+});
\ No newline at end of file
diff --git a/app/zadanieDnia2.js b/app/zadanieDnia2.js
index 85846f4..56571cc 100644
--- a/app/zadanieDnia2.js
+++ b/app/zadanieDnia2.js
@@ -1,3 +1,24 @@
+//Twój kod
+
+const crypto = require('crypto');
 const ENCRYPTED_TEXT = '4f9fa8f98650091c4910f5b597773c0a48278cfb001fe4eb3ff47ada85cbf0ed3dc17016b031e1459e6e4d9b001ab6e102c11e834a98dce9530c9668c47b76ee6f09d075d19a38e48b415e067c6ddcfad0d3526c405a4f4f2fb1e7502f303c40';
+const algorithm = ['aes192', 'aes-256-cbc', 'aes-256-ecb'];
+const text = 'Pobawmy się jak komputerowy Detektyw';
+let password = '';
+
+text.split(' ').forEach( textElem => {
+    password += textElem[0] + textElem[textElem.length-1];
+});
+
+algorithm.forEach( algorithmElem => {
+    const decipher = crypto.createDecipher(algorithmElem, password);
+    
+    let decrypted = decipher.update(ENCRYPTED_TEXT, 'hex', 'utf8');
+    try {
+        decrypted += decipher.final('utf8');
+        console.log(`Good hacking! Decrypted text: \n ${decrypted}`);
+    } catch(err) {
+        console.log("You are a weak hacker.");
+    }
+});
 
-//Twój kod
\ No newline at end of file