[HTML5's `keygen` element]: http://www.w3.org/TR/html5/forms.html#the-keygen-element

[initialization vector]: https://en.wikipedia.org/wiki/Initialization_vector

[NIST SP 800-131A]: http://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-131Ar1.pdf

[NIST SP 800-132]: http://csrc.nist.gov/publications/nistpubs/800-132/nist-sp800-132.pdf

[NIST SP 800-132]: http://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-132.pdf

[OpenSSL cipher list format]: https://www.openssl.org/docs/man1.0.2/apps/ciphers.html#CIPHER-LIST-FORMAT

[OpenSSL's SPKAC implementation]: https://www.openssl.org/docs/man1.0.2/apps/spkac.html

[publicly trusted list of CAs]: https://mxr.mozilla.org/mozilla/source/security/nss/lib/ckfw/builtins/certdata.txt

release.

*Note*: On POSIX systems, the operating system release is determined by calling

uname(3). On Windows, `GetVersionExW()` is used. Please see

[uname(3)][]. On Windows, `GetVersionExW()` is used. Please see

https://en.wikipedia.org/wiki/Uname#Examples for more information.

## os.tmpdir()

* Returns: {string}

The `os.type()` method returns a string identifying the operating system name

as returned by uname(3). For example `'Linux'` on Linux, `'Darwin'` on macOS and

`'Windows_NT'` on Windows.

as returned by [uname(3)][]. For example `'Linux'` on Linux, `'Darwin'` on macOS

and `'Windows_NT'` on Windows.

Please see https://en.wikipedia.org/wiki/Uname#Examples for additional

information about the output of running uname(3) on various operating systems.

information about the output of running [uname(3)][] on various operating

systems.

## os.uptime()

<!-- YAML

[`process.arch`]: process.html#process_process_arch

[`process.platform`]: process.html#process_process_platform

[OS Constants]: #os_os_constants

[uname(3)]: https://linux.die.net/man/3/uname