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+md5deep is a cross-platform set of programs to compute MD5, SHA-1, SHA-256,
+Tiger, or Whirlpool message digests on an arbitrary number of files. md5deep
+is similar to the md5sum program found in the GNU Coreutils package, but has
+the following additional features:
+* Recursive operation - md5deep is able to recursive examine an entire
+ directory tree. That is, compute the MD5 for every file in a directory and
+ for every file in every subdirectory.
+* Comparison mode - md5deep can accept a list of known hashes and compare them
+ to a set of input files. The program can display either those input files
+ that match the list of known hashes or those that do not match. Hashes sets
+ can be drawn from Encase, the National Software Reference Library, iLook
+ Investigator, Hashkeeper, md5sum, BSD md5, and other generic hash generating
+ programs. Users are welcome to add functionality to read other formats too!
+* Time estimation - md5deep can produce a time estimate when it's processing
+ very large files.
+* Piecewise hashing - Hash input files in arbitrary sized blocks
+* File type mode - md5deep can process only files of a certain type, such as
+ regular files, block devices, etc.