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Add rc4 cipher #12687

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Add rc4 cipher #12687

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QuantumSoham
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Summary

Added an RC4 (Rivest Cipher 4) stream cipher algorithm under ciphers/ directory.

  • Implements KSA and PRGA phases.
  • Encrypts and decrypts using XOR.
  • Fully type hinted and documented.
  • Includes docstrings with doctests.
  • CLI support via argparse.

All style and type checks (pre-commit, ruff, mypy) have passed.

Issue

No linked issue. (New Algorithm)

@algorithms-keeper algorithms-keeper bot added tests are failing Do not merge until tests pass labels Apr 27, 2025
@Charuvarthan
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Should this be tested using doctest?

@QuantumSoham
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Should this be tested using doctest?

no not doctest
run using
python rc4.py encrypt Key Plaintext
or python rc4.py decrypt Key bbf316e8d940af0ad3

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@QuantumSoham @Charuvarthan