file-crypt

file-encrypt is simple file command line tool that can:

• encrypt a single file with given password
• decrypt a previously encrypted file.

Building file-encrypt

1. setup openssl libraries. brew install openssl brew install openssl-dev
2. Build the executable with make

Usage

Encrypt a file: ./file-crypt ENCRYPT test.txt test.enc

Decrypt file: ./file-crypt DECRYPT test.enc decrypted.txt

TODO

• Use getopt(3) to improve cmdline options to be like ./file-crypt -e ./file-crypt -d
• Use exit codes to specify status of operation such as
  • 0 for success
  • 1 for failure like mismatch password
  • 2 inputfile not found or is not encrypted file.
  • 3 for failure to create/write outputfile
• Create testassets directory and move test.c into it.
• Add more test cases for things like
  • missing files
  • bad files
  • inaccessible file
  • zero size file
  • empty password
  • case-sensitive check for passwords.
• Add repeatability tests to make sure sameinput and same password generates same encrypted file.
• Add performance tests
  • encrypt a fixed size file multiple (100) times. Measure time, memory usage.
  • decrypt a fixed size file multiple (100) times. Measure time, memory usage.
  • start with small file and keep doubling size and measure time taken for encrypt/decrypt operations