Adding sha256 and sha512 to C?

[sand]

Leo (sdl.web at gmail.com) recently added the gnulib "sha1" function to
Emacs' C code.  The gnulib crypto library also has sha256 and sha512
functions; is there any objection to adding those as well?  Researchers
discovered better-than-brute-force attacks against SHA-1 back in 2005
(http://www.schneier.com/blog/archives/2005/02/cryptanalysis_o.html).
Because of this, in 2006 the NIST recommended that application and
protocol designers switch to SHA-2 family hash functions by 2011
(http://csrc.nist.gov/groups/ST/hash/policy.html).  Providing C
versions of the SHA-2 functions will make it easier for developers to
use the those stronger functions in new applications.

Thanks,

Derek

-- 
Derek Upham
address@hidden