Difference between revisions of "Faq how to calculate or verify the MD5 or SHA1 hashes on a file"
(Created page with "===Issue:=== How do I calculate / verify the MD5 or SHA1 hashes on a file? ===Possible Solutions:=== To assist users who are concerned about the security of the files they...")
Latest revision as of 09:08, 28 December 2018
How do I calculate / verify the MD5 or SHA1 hashes on a file?
To assist users who are concerned about the security of the files they are downloading from Eigenvector Research's website, we provide "security hashes" of all download files. A hash is a checksum which helps assure that the file you received is the same as the one we built and your download request was not intercepted by a 3rd party and infected with a virus (for example).
On the Download page of our website, we report the MD5 and SHA1 hashes for each file available for download. Once you download a file, you can confirm you received a valid, complete, unadulterated copy by checking that you get the same checksum hashes on the file. The method to calculate these hashes depends on the operating system you are running:
There are numerous programs to calculate MD5 and SHA1 hashes. We have confirmed that the algorithm we use matches the results obtained when using the Microsoft-supplied "Fciv" program. This is available from Microsoft's website through one of these two Knowledge base articles:
- Availability and description of the File Checksum Integrity Verifier utility
- How to compute the MD5 or SHA-1 cryptographic hash values for a file
Download the Fciv application and follow the directions on those knowledge-base pages to calculate the MD5 and SHA1 checksums of any file.
Note also that our EXE-based installers also verify the contents of the files being installed. If the internally-stored checksums do not match the EXE contents, the installer will fail with a warning that the file is corrupt.
The commonly available "openssl" program can be used to calculate the checksums using the commands:
openssl md5 filename.ext openssl sha1 filename.ext
filename.ext is the full filename (including path if necessary) of the downloaded file.
Still having problems? Please contact our helpdesk at firstname.lastname@example.org