bethela - CLI file cryptography

A simple terminal command line tool for encryption & decryption of any files, currently supports Vigenere, AES128-CBC, AES192-CBC and AES256-CBC ciphers.

The program can also use hardware acceleration technology for AES ciphers using AES-NI (Intel and AMD CPUs) and ARM-neon (armv8, aarch64 CPUs) intrinsics.

Install in Linux

• Requirement:
  • make
  • compiler that can compile with or above C++17

1. Clone the repo

   git clone --recurse-submodules https://github.com/mrdcvlsc/bethela
   git submodule update --init --recursive
   cd bethela
   

2. Compile the program

   Example:

   make compile CXX=clang++ VERSION=aesni TYPE=release
   

   This table shows what values you can pass to a dflag during compilation to alter the compilation behaviour.

   If a variable flag is not specified, the first value in the table below are taken as the default values.

   Variable	Value
   CXX	g++, clang++
   TYPE	release, debug, debug_threads
   VERSION	portable, aesni, neon
   LINK	dynamic, static

   aesni - will enable hardware acceleration technology AES-NI when compiling for x86-64 Intel and/or AMD CPUs.

   neon - will enable hardware acceleration technology in ARM when compiling for ARM armv8/aarch64 CPUs.

3. Install the program to usr/local/bin (for linux)

   make install
   

   To Uninstall the program in usr/local/bin (for linux), use the command below

   make uninstall
   

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Generate a key file:

bethela --generate key_filename key_size_in_bytes

The key size should be a positive number greater than 0

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Encrypt/Decrypt with replace

Adding -replace command when encrypting/decrypting will replace the old files with the encrypted/decrypted files.

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Vigenere Cipher

Requires any key file sizes.

bethela --encrypt-replace keyfile file1 file2 ... fileN
bethela --decrypt-replace keyfile file1.bthl file2.bthl ... fileN.bthl

---

AES-128

Requires a 128-bit key, or 16 byte key file size.

bethela --enc-AES128-replace keyfile file1 file2 ... fileN
bethela --dec-AES128-replace keyfile file1.bthl file2.bthl ... fileN.bthl

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AES-192

Requires a 192-bit key, or 24 byte key file size.

bethela --enc-AES192-replace keyfile file1 file2 ... fileN
bethela --dec-AES192-replace keyfile file1.bthl file2.bthl ... fileN.bthl

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AES-256

Requires a 256-bit key, or 32 byte key file size.

bethela --enc-AES256-replace keyfile file1 file2 ... fileN
bethela --dec-AES256-replace keyfile file1.bthl file2.bthl ... fileN.bthl

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Help flag

bethela --help

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External Libraries

• AES - for AES encryption with hardware acceleration support.
• BytePadding - for simple padding operations.
• BlockCipherModes - for block cipher encryption modes.