[OpenWrt-Devel] SHA512/SHA256 hashes truncated/busybox weirdness

Nikos Mavrogiannopoulos n.mavrogiannopoulos at gmail.com
Thu Jan 7 03:08:28 EST 2016

On Sun, 2016-01-03 at 11:17 -0800, Chris Marchesi wrote:
> Hey!
> I tried to change the default passwd algorithm used by busybox to 
> sha512, but got some strange looking hashes back by passwd after 
> changing.
> They basically had the algorithm and the salt (maybe) squashed, like 
> below.
> $6abCDefGH:(rest of shadow entry here)

That is a uclibc bug. When it didn't support the algorithm it
incorrectly used the DES crypt instead. Most likely the openwrt uclibc
doesn't contain the fix.


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