file checksum?

[William Park]

Hi,

I would like to do some kind of "checksum" on files (full or partial
content) in order to catch unwanted changes (accidental or malicious).
How would you do it?

So far, I found
    - MD/SHA digests from OpenSSL -- I'm worried about speed, and being
      dependent on yet another library.
    - crypt() from glibc -- It can do MD5/SHA, but it has to be a single
      string.  It can't do multiple strings.

Is there user-callable CRC routines in glibc?  Curiously, I can't find
one, even though I'm told that TCP stack uses it internally.
-- 
William
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