bastie/swift_crypto

A Swift library and command-line tool to encrypt/decrypt using NTRU (https://github.com/tbuktu/ntru) (quantum computer attack resistant encryption) or XOR (a single/shared-key cryptosystem).

Introduction

Crypto may be used as a library to encrypt/decrypt data or called as a command line tool which reads/writes to/from stdin/stdout.

Library Methods

• com.tiffanytimbric.crypto.ntru.NtrCryptosystem
  • encrypt(...)
  • decrypt(...)
• com.tiffanytimbric.crypto.noop.XorCryptosystem
  • encrypt(...)
  • decrypt(...)
• com.tiffanytimbric.crypto.noop.NoopCryptosystem
  • encrypt(...)
  • decrypt(...)

Command Line Usage

Please read usage-.txt which you will find within the conf folder.

Usage Examples

You may want to add the path to this project's "bin" to your shell's PATH environment variable. The below examples assume the current working directory (CWD) of the shell equals the "cli" folder of this project.

$ cd "${CRYPTO_HOME}/cli"

Encrypting Streams

$ echo 'Hello, World!' | bin/crypto -c XOR -e | bin/crypto -c XOR -d

Encrypting Files

$ wc -l lorem_ipsum_100.txt

$ cat lorem_ipsum_100.txt | bin/crypto -c XOR -e | bin/crypto -c XOR -d > /tmp/a_file.txt && wc -l lorem_ipsum_100.txt /tmp/a_file.txt && diff -q lorem_ipsum_100.txt /tmp/a_file.txt
$ rm /tmp/a_file.txt

$ cat lorem_ipsum_100.txt | bin/crypto -c XOR -e | bin/crypto -c XOR -d  > /tmp/a_file.txt && wc -l lorem_ipsum_100. txt /tmp/a_file.txt && diff -q lorem_ipsum_100.txt /tmp/a_file.txt
$ rm /tmp/a_file.txt

$ cat lorem_ipsum_100.txt | bin/crypto -c NTRU -e | bin/crypto -c NTRU -d  > /tmp/a_file.txt && wc -l lorem_ipsum_100.txt /tmp/a_file.txt && diff -q lorem_ipsum_100.txt /tmp/a_file.txt
$ rm /tmp/a_file.txt

$ cat lorem_ipsum_100.txt | bin/crypto -c NTRU -e | bin/crypto -c NTRU -d  > /tmp/a_file.txt && wc -l lorem_ipsum_100.txt /tmp/a_file.txt && diff -q lorem_ipsum_100.txt /tmp/a_file.txt
$ rm /tmp/a_file.txt

Encrypting Tar Archives

$ cp -v lorem_ipsum_100.txt lorem_ipsum_100.2.txt
$ tar -I 'bin/crypto -c XOR -e' -cf lorem_ipsum_100.2.txt.txor lorem_ipsum_100.2.txt
$ rm lorem_ipsum_100.2.txt

$ tar -I 'bin/crypto -c XOR' -xf lorem_ipsum_100.2.txt.txor
$ diff -q lorem_ipsum_100.txt lorem_ipsum_100.2.txt
$ rm lorem_ipsum_100.2.txt*

Base<16|32|64> Encoding Files

$ cat lorem_ipsum_5.txt | bin/crypto -c NOOP -e -b 64 > lorem_ipsum_t.txt.base65 && cat lorem_ipsum_5.txt.base64 | bin/crypto -c NOOP -d -b 64

Code Analysis

This Java code includes two separate implementation techiques for multi-threaded/concurrent processing, one using the JDK's ExecutorServices and another using RxJava 3.x. The RxJava implementation is less readable, less concise. The significant additional features RxJava offers are not used in this application as they are not needed. RxJava offers no benefits to this application. It was introduced merely as a coding exercise.