This is my implementation of RC4 algorithm and CipherSaber.
You may run some functional tests with:
make check
Also, you may build the project with:
make
To cipher a file with RC4, you need a (hopefully secret) key stored in a file. arcfour program will cipher or decipher the stdin and write the result to stdout.
For example:
echo -n "Secret" > my.key # my secret key
echo -n "Attack at dawn" | ./arcfour my.key > message.rc4 # The encrypted message
To decipher, you need the same key:
./arcfour my.key < message.rc4
To cipher with CipherSaber, you need a secret key again. But this time, first parameter is cipher or decipher.
echo -n "Attack at dawn" | ./saber1 cipher my.key > message.cs
Then, if you want to decipher the message:
./saber1 decipher my.key < message.cs
There is a lot of ways to create a secret key. You may use a passphrase or a random stream of bytes.
This is a way to create a secret key with 128 bytes long:
head -c 128 < /dev/urandom > my.key
chmod 400 my.key