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Address noise_rand_bytes silent failure on Windows: #63

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Address noise_rand_bytes silent failure on Windows: #63

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Commits on Jul 15, 2024

  1. Address noise_rand_bytes silent failure on Windows: 

    Per its documentation, `noise_rand_bytes` returns "cryptographically-strong
random bytes from the operating system."

On Windows, the existing implementation of the function does not check that
the `CryptGenRandom` API succeeds. While failure is unlikely, it is prudent
to actually check.

If merged this commit will cause the process to exit if the function is not
able to generate the requested number of random bytes; the code also checks
that the provided buffer is non-null and that the number of bytes requested
is non-zero.
    @nbougalis
    nbougalis committed Jul 15, 2024
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