Co:Z algorithms and key exchanges

Discussion of the Co:Z Co-Processing Toolkit for z/OS
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Co:Z algorithms and key exchanges

Post by RASC?HE » Thu Apr 18, 2019 3:39 pm


Our company uses the Co:Z software to transfer files from the mainframe to external vendors. We have version “CoZBatchÝN¨: version: 4.5.1 2017-10-09”

One of our new vendors SFTP site now enforces a new key exchange “diffie-hellman-group-exchange-sha256” and a mac algorithms of “hmac-sha2-256”.

Will the version we have of Co:Z support this change?

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Re: Co:Z algorithms and key exchanges

Post by dovetail » Tue Apr 23, 2019 6:13 pm

Co:Z SFTP uses z/OS OpenSSH for its underlying ssh connection.

KEX, Cipher, MAC, and key algorithm support is provided by OpenSSH

Refer to the z/OS OpenSSH User's Guide for supported algorithms.

Also, there are these commands:

ssh -Q kex # display supported kex algorithms
ssh -Q mac # display supported mac algorithms

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