Add BCryptGenRandom for WINVER >= 0x0600

[raidenluikang]

For Windows Vista and newer versions available bcrypt.h and BCryptGenRandom - which recommend in newer os.

Could add it ?

And add more macro for detection Windows, for ex., boost predef uses these macros:

_WIN32
_WIN64
__WIN32__
__TOS_WIN__
__WINDOWS__

[dsprenkels]

Thank you for the heads-up! I agree that this should indeed happen.

Reference material:

• https://learn.microsoft.com/en-us/windows/win32/seccng/cng-portal
• https://learn.microsoft.com/en-us/windows/win32/api/bcrypt/nf-bcrypt-bcryptgenrandom

Steps:

• Implement the damn thing
• Release?
• Notify known users of new release

@raidenluikang I am going to open an separate issue for the extra requested macro detection, if you're all right with that.

[DogeProtocol]

We came up with an implementation (lines 82 to 125)

BCryptGenRandom and fallback to CryptAcquireContext

https://github.com/DogeProtocol/hybrid-pqc/blob/main/random/randombytes.c

[DogeProtocol]

CryptAcquireContext is deprecated and will be removed from new versions of Windows as per Microsoft documentation