How to create SHA512 file hash

[so.nimda]

Hi,

Would someone be able to advise how I can create a SHA512 hash for a data file e.g. csv?

We are doing some data transfer (automated) and would like to have this hash to ensure the integrity of the data file that is being sent over.

What I have read and found online so far relates to hashing of passwords and not on data files.

Is it doable?

Thanks in advance.

[Steven Schweda]

> [...] how I can create a SHA512 hash for a data file e.g. csv?

   You could use OpenSSL.  For example (here, on a VMS system, but it's
portable, right?):

its $ openssl dgst -sha512 login.com
SHA512(login.com)= 5aa178f02f8ea781ebef4f10936ef5abc3d852bbfb424b22d51c70446037f
bbda31b6cbfdc970dfa840395b7aeefe8cdfe7364582b8d0f68d0a1b667a579c7da

[Steven Schweda]

> We are doing some data transfer (automated) and would like to have
> this hash to ensure the integrity of the data file that is being sent
> over.

   If you're not wedded to SHA512, then you might consider something
simple, like a zip archive.  The zip archive standard includes a CRC-32
checksum.  You'd get compression and a per-file CRC-32 data integrity
check with minimal extra effort.

[so.nimda]

Hi Steven,

Thanks for your reply.

I am using HPUX so need to figure out how to run OpenSSL.  Basically, the host system (HPUX) needs to automate sftp a data file over to a Windows server for processing, so need to ensure that integrity of this data file is correct.

If a hash can be successfully generated, this mean 2 files need to be sent over - the data file and the hash file. 

Is that correct?

Thanks 

[Steven Schweda]

> I am using HPUX so need to figure out how to run OpenSSL.

      https://h20392.www2.hpe.com/portal/swdepot/displayProductInfo.do?productNumber=OPENSSL11I
      http://hpux.connect.org.uk/hppd/hpux/Development/Libraries/openssl-1.0.2n/

> If a hash can be successfully generated, this mean 2 files need to be
> sent over - the data file and the hash file.

   Generally, yes, but you could put both of them into a zip archive,
and send that.  (You could instead use something like "tar", but I'd
expect it to be easier to deal with a zip archive on Windows.)  Whether
you need a hash digest with a zip archive is another question.

> [...] the host system (HPUX) needs to automate sftp a data file over
> to a Windows server [...]

   You already have SFTP (SSH) on the HP-UX system?