feat: Implement Crypto Algorithms (SHA256 and ChaCha20) #676
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*created a crypto class *implemented sha256 encryption (ref: https://github.com/TheAlgorithms/Python/blob/master/hashes/sha256.py)
* added tests and docstring for sha256
*formatting
*implemented and added tests for ChaCha-20 Poly1305
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References to other Issues or PRs or Relevant literature
Fixes #592
Brief description of what is fixed or changed
Implementing cryptographic algorithms - SHA256 and ChaCha20-Poly1305. Both the algorithms have been implemented in pure python. Additional cryptographic algorithms can be added in the Crypto class. Suitable tests added.
Other comments
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