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A simple One Time Password (OTP) library in C, supports C++

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I am not sure where the root cause is, but the SHA256 and SHA512 are failing in my tests with the test/main.c* programs. Isolation necessary.

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Another set. First 2 are more or less easy. The third is more complicated, see the commit message. 1. correct error messages from tests; 2. constant time computation; 3. rewrite...