Implementation of the stream cipher - RC4 (Rivest Cipher 4)

From Wikipedia

The RC4 Encryption Algorithm, developed by Ronald Rivest of RSA, is a shared key stream cipher algorithm requiring a secure exchange of a shared key. The symmetric key algorithm is used identically for encryption and decryption such that the data stream is simply XORed with the generated key sequence.

Python 2 version

$ python2 rc4-2.py

$ python2 -m pytest rc4-2.py

Python 3 version

$ python3 rc4-3.py

$ python3 -m pytest rc4-3.py

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