adding OAEP functionality #12
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Pure RSA is vulnerable to known plaintext, known cipher text and chosen plaintext attacks. OAEP provides a way to scramble a message before it is encrypted that is relatively quick and robust. This commit includes some code from https://github.com/amosnier/sha-2 . This may not be the fastest implementation and I have had some trouble with the use of uint8_t, but any kind of OAEP is better than nothing.
Feel free to message me about anything that doesn't make any sense in my commit.