For Ciphers and (H)Macs, IBM z/OS OpenSSH (not the sftp component) will use either
a) CPACF instructions, for the popular Ciphers and MACs b) ICSF calls (an ICSF uses CPACF where it can). CPACF instructions are GP instructions. c) unassisted algorithms in OpenSSH/LibreSSL code. CPACF (the default) is the fastest, followed by ICSF, followed by software algs. Under no circumstances will Crypto Copressors be used for Ciphers and Macs. See the IBM z/OS OpenSSH User's Guide for more details. See "Ciphers" and "MACs" options as well as CiphersSource and MACsSource options for ssh and sshd. Kirk Wolf Dovetailed Technologies https://coztoolkit.com On Tue, Aug 26, 2025, at 10:50 AM, Steve Beaver wrote: > Because I don't know, > > > > Using SFTP under BPX on zOS. Do those Cyphers use the CRYPTO-Coprocessors > or do they only use the GP's? > > > > TIA > > > > Steve > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
