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From: Richard Haines <richard_c_haines@btinternet.com>
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Subject: Re: did libselinux grow a new build dependency? (openssl-devel:
 openssl.h)
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FYI 

The implementation at www.ghostscript.com/doc/jbig2dec/sha1.c
and CryptLib are both from the same original author
Steve Reid <sreid@sea-to-sky.net>

I've now tested and timed both implementations along with the
Android version + openssl.

openssl and Steve's implementations are about twice as fast
as the Android version.

I'll submit a patch based on the sha1 files extracted from CryptLib
as that is the latest one to be updated.