$dll(sha256.dll,SHA256,text goes here)
	Returns a SHA256 checksum of the text

There's also sha224, sha384, and sha512. And also SHA224 and sha384, etc.

If the DLL I've uploaded causes mIRC to crash, or returns an invalid checksum,
shoot me an email at d,dot,sha256,at,delinked,dot,us  Hopefully you can figure
that out.
