crypto: portable AES key expansion without allocations #9508
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@SyntheticBird45 reported that the OpenBSD compiler gives warnings about string functions used in `oaes_sprintf`, as well as use of `rand()` in `oaes_key_gen`. Neither of these functions are used in the codebase. Removing the unused OAES functions silences these warnings.
Calling `oaes_alloc`, then `oaes_key_import_data`, then `oaes_free` calls the functions `calloc` and `free` four times each. This PR rewrites the key expansion function to expand directly into a 240 byte buffer with no allocations. This should speed up Cryptonight on platforms such as Raspberry PI. Hash tests are expanded to test slow hash using software AES on all platforms. Depends on monero-project#9505
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Calling
oaes_alloc, thenoaes_key_import_data, thenoaes_freecalls the functionscallocandfreefour times each. This PR rewrites the key expansion function to expand directly into a 240 byte buffer with no allocations. This should speed up Cryptonight on platforms such as Raspberry PI. Hash tests are expanded to test slow hash using software AES on all platforms.Depends on #9505