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About: Entropy-supplying system calls     Goto   Sponge   NotDistinct   Permalink

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Entropy-supplying system calls are system calls in Unix-like operating system kernels through which processes can obtain entropic or random data. The first of these was getentropy, introduced to the OpenBSD operating system in release 5.6 (November 2014), as a refactoring of the sysctl(3) KERN_ARND approach used since 1997. Linux offers a very similar system call, getrandom, which was based on getentropy. It was first available in Linux 3.17, released in October 2014. In July 2015, Solaris introduced slightly modified versions of getentropy and getrandom. In August 2015, FreeBSD introduced the read_random system call for obtaining random data from the kernel.