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Implement the ElGamal cryptographic encryption/decryption algorithm in PHP.
- Design of a simple API.
- Implementation of the code based on definition of the algorithm in the open literature. We require original PHP code, using the PHP Big Integer library.
- Implementation of a test infrastructure with random test vectors, to demonstrate that results are identical to a reference implementation (some options: pycrypto, BouncyCastle).
- The implementation should include unit test code.
See this link as a reference: [obscured] /p/opensocial-python-client/source/browse/trunk/src/opensocial/Crypto/PublicKey/ElGamal.py?r=65
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