"CODE MARS" for Android

I need to create a encryption program called "Mars Code". This application is for secure text encryption. The program should work on a phone (Android) and on a computer (Windows).

I have a full technical instruction: I know how the program should work, I just need help with building the project.

📲 The program should work as follows:

• User enters text

• Enters a passphrase, or inserts a ready SHA256 key, or chooses from 32 preloaded keys

• The program encrypts the text using AES-256

• The result is encoded in Base32

• Converted into Morse code

• A QR code is generated

• QR → scan and decode the message back

🔐 The key is set in 3 ways:

1. Text phrase (processed via SHA-256 → AES key)

2. Ready SHA256 key (64 hex characters)

3. Choosing one of 32 pre-prepared SHA256 keys (in assets/keys.txt)

🛠️ What needs to be done:

• Build .apk for Android

1. For PC (Windows):

   • Build an installer or .exe

   • Ensure all functions work: encryption, decryption, QR codes, Morse code
     
     
     

The program performs two main actions:

🔒 1. Text encryption

🔓 2. Text decryption

🔐 Encryption

1. User enters text to encrypt
   → for example: This is a secret message

2. User sets the key in one of three ways:

   • Phrase (any text):
     → the program calculates SHA-256 of this phrase → obtains a 256-bit AES key

   • Ready key:
     → 64-character hex string, which directly becomes the AES key

   • Choice from 32 keys:
     → one of the pre-prepared SHA256 hashes is selected

3. AES-256 encryption:

   • Input: text + key (256-bit)

   • Uses mode AES/ECB/PKCS5Padding

   • Result — byte array (encrypted text)

4. Encoding in Base32

   • Bytes → Base32 string (only letters A–Z and digits 2–7)

   • For example: IFBEGRCFIZDUQSKKJNGE====

5. Conversion to Morse code

   • Each Base32 symbol is translated into Morse:

     • A → .-

     • B → -...

     • 2 → ..---

     • etc.

   • Result: dots and dashes — for radio transmission, sound, visual

6. Creating QR code

   • Base32 string is converted into a QR code

   • It can be saved, displayed, printed

🔓 Decryption

1. User:

   • Enters or scans QR code

   • Receives Base32 string

2. Key is set similarly:

   • phrase → SHA-256 → AES key

   • or hex key

   • or choice from 32

3. Decoding Base32 → bytes

4. Decrypting AES-256 (same mode)

5. Output the result as UTF-8 text

📋 Summary of the scheme

cssCopyEdit[Text] + [Key] → SHA-256 (if needed) → AES-256 → bytes → Base32 → Morse / QR



[Base32] + [Key] → AES-256 → Text

📦 Input data:

• Input text

• Passphrase / hex key / selected key

• (in decryption mode — Base32 or QR)

📤 Output data:

• Base32 string

• Morse code

• QR code

• Decrypted text (when decrypting)