> I'm not able to find code for some of the digest functions like
> MD5_Update() ,SHA1_Update().
> in the latest source dump.


Many OpenSSL functions are implemented in non-traditional manners, such as
via macro's, assembly language, etc.

If you are on a Unix/Linux platform, using something like "nm -o
libcrypto.a | grep SHA1_Update" will get you started. In this case,
sha1dgst.c.

Good luck figuring it out.

/r$

--
STSM, Senior Security Architect
DataPower SOA Appliances
http://www.ibm.com/software/integration/datapower/

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