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If you made a hash function that worked like this:

SHA(std::hash(T input)

Would it be a secure hash? The reason I am asking is that std::hash provides a template input, which is much more convenient than the alternative provided by Crypto++, which requires a string input.

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Cryptographic hash function should be collision resistant, i.e., nobody should be able to find two inputs having the same hash value. For non-cryptographic hash functions (like std::hash) this is not required, so someone might be able to find two inputs having the same output on std::hash.

Always ask yourself: What happens if you apply SHA to these outputs? Do you get a collision of your construction?

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