In snow leopard there is program that can do md4 checksums. How can I verifiy a .md5 file?
I see two ways for you,
get macports for your system from http://www.macports.org and install the base package. Then, install the port "md5sha1sum", which has the option "-c" to read a file containing checksums and compare files to it.
I assume you have a MD5 checksum file of the form:
(note that the separator are 2 spaces)
now, create new MD5 checksums locally with openssl, like:
which will produce
the output is different, but you can transmogrify that to match what GNU md5 makes:
this gives you a checksum file to compare to the original checksum file. Do a diff and you're finished ;-)
In OSX, it's simply md5 or openssl md5
Edit for clarification: You would then compare the output of the md5 command to the values in the .md5sum file to verify that the files are the same.