🔐 PassManager Accounts

Secure Password Manager with SHA-256 Hashing

A lightweight, console-based password manager written entirely in C. It secures your account credentials locally using salted SHA-256 cryptographic hashing and a master password.

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• 🛡️ High Security: Implements a custom SHA-256 hashing algorithm from scratch. Passwords are never stored in plain text.
• 🧂 Cryptographic Salting: Generates random 16-byte salts for every single entry to prevent rainbow table attacks.
• 🔑 Master Password Protection: The entire vault is locked behind a master password. You cannot read, write, or delete without verifying the master key.
• 💾 Dynamic Local Storage: Automatically saves and manages data locally using binary files (master.dat and accounts.dat).
• 🛠️ Full CRUD Operations: Easily Add, List, Search, and Delete your saved accounts.

You have two ways to run this password manager:

If you already have the compiled .exe file:

1. Open your terminal or command prompt.
2. Run the executable:

   passman.exe

   (Note: The app will create master.dat and accounts.dat in the same folder to save your details.)

If you want to compile the C code yourself, ensure you have a C compiler (like gcc) installed.

1. Clone the repository:

   git clone https://github.com/xedi1/PassManager-Accounts-With-Security-Hash-SHA256.git
   cd PassManager-Accounts-With-Security-Hash-SHA256

2. Compile the code:

   gcc src.c -o src

3. Run the program:

   ./src

This project demonstrates low-level memory and file management in C, alongside cryptographic principles:

• File I/O: Uses fread and fwrite for reading/writing structured binary data to .dat files.
• Memory Management: Utilizes dynamic memory allocation (malloc, calloc, realloc, free) to handle arbitrary lengths of account data safely.
• Bitwise Operations: The SHA-256 implementation heavily relies on 32-bit and 64-bit bitwise shifts (rotr, ch, maj) to generate secure hashes.