Feat/add ChaCha20 #6984
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Feat/add ChaCha20 #6984
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This PR adds an implementation of the ChaCha20 stream cipher algorithm, as specified in RFC 8439.
It includes:
ChaCha20.java: The core implementation for encryption and decryption.ChaCha20Test.java: JUnit tests, including vectors from RFC 8439, symmetry tests, and validation checks.