md5sum, sha1sum, sha256sum and crc32sum for Windows
======================================================================

This set of free Windows command-line utilities is based on the original `md5sum` program written by Branko Lancaster in 1993.

They generate or check the hash digest of a file or list of files using MD5, SHA-1, SHA-256 or CRC32. OK, so CRC32 is not a hash digest algorithm--it's only a checksum--but you get the idea.

They all work identically. Note that the default behaviour is binary mode. For help use the -h option.

Examples:-

	>sha1sum *.txt
	f7c3bc1d808e04732adf679965ccc34ca7ae3441 *123-9.txt
	a9993e364706816aba3e25717850c26c9cd0d89d *abc.txt
	2aae6c35c94fcfb415dbe95f408b9ce91ee846ed *hello.txt
	88a5b867c3d110207786e66523cd1e4a484da697 *hellon.txt

	>sha1sum -t *.txt
	f7c3bc1d808e04732adf679965ccc34ca7ae3441  123-9.txt
	a9993e364706816aba3e25717850c26c9cd0d89d  abc.txt
	2aae6c35c94fcfb415dbe95f408b9ce91ee846ed  hello.txt
	22596363b3de40b06f981fb85d82312e8c0ed511  hellon.txt

	>sha1sum *.txt > output.sha

	>type output.sha
	f7c3bc1d808e04732adf679965ccc34ca7ae3441 *123-9.txt
	a9993e364706816aba3e25717850c26c9cd0d89d *abc.txt
	2aae6c35c94fcfb415dbe95f408b9ce91ee846ed *hello.txt
	88a5b867c3d110207786e66523cd1e4a484da697 *hellon.txt

	>sha1sum -c output.sha

	>sha1sum -v -c output.sha
	123-9.txt      OK
	abc.txt        OK
	hello.txt      OK
	hellon.txt     OK

	>sha1sum -h
	Usage:
	  sha1sum [-b|-t] [FILES...]
	  sha1sum [-v] -c [FILE]
	  sha1sum [-hVL]
	Generates or checks SHA-1 Message Digests
	  -c  check message digests (default is generate)
	  -v  verbose, print file names when checking
	  -b  read files in binary mode (default)
	  -t  read files in text mode
	  -h  display this help and exit
	  -V  display version information and exit
	  -L  display license and exit
	The input for -c should be the list of message digests and file names
	that is printed on stdout by this program when it generates digests.

	>md5sum *.txt
	25f9e794323b453885f5181f1b624d0b *123-9.txt
	900150983cd24fb0d6963f7d28e17f72 *abc.txt
	5eb63bbbe01eeed093cb22bb8f5acdc3 *hello.txt
	a0f2a3c1dcd5b1cac71bf0c03f2ff1bd *hellon.txt

	>crc32sum *.txt
	cbf43926 *123-9.txt
	352441c2 *abc.txt
	0d4a1185 *hello.txt
	38e6c41a *hellon.txt
	
	>sha256sum *.txt
	15e2b0d3c33891ebb0f1ef609ec419420c20e320ce94c65fbc8c3312448eb225 *123-9.txt
	ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad *abc.txt
	b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9 *hello.txt
	572a95fee9c0f320030789e4883707affe12482fbb1ea04b3ea8267c87a890fb *hellon.txt


Licensed under the [BSD-2-Clause License](https://opensource.org/license/BSD-2-Clause)

For more information, see our web site <https://di-mgt.com.au/generate-file-checksums.html>

David Ireland  
DI Management Services Pty Ltd  
Australia  
<https://di-mgt.com.au/contact/>  
First published 2004-07-24. This version 2025-11-02.