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Status Delivered
Workspace IBM Z and LinuxONE Systems Hardware
Categories Crypto HW
Created by Guest
Created on Apr 8, 2020

RELATED IDEAS

Diffie-Hellman (DH/DHE) Hardware Support in Crypto Express/ICSF

Add support in hardware (CPACF or more likely, Crypto Express 6S/7S) for Diffie Hellman operations performed as part of DH/DHE/ECDH/ECDHE key exchanges and make the necessary coordinating changes in ICSF to expose this support to the software stack.

Crypto Express currently performs hardware acceleration for asymmetric key operations such as RSA/DSA/ECDSA/etc. but does not support ephemeral key exchanges based on the Diffie-Hellman algorithm. As such, these exchanges are performed in software and expend a considerable amount of general processor time. As support and usage of DHE/ECDHE ciphersuites expands due to more stringent security standards, firms such as ours are forced to choose between security and perfomance when considering ciphers to use.

Idea priority High
  • Guest
    Reply
    |     Aug 10, 2021

    For your TLS 1.2 connections, your selected cipher suites - TLS_ECDHE_ECDSA_WITH_AES256_GCM_SHA384 and TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 are supported with CPACF and ICSF FMID HCR77D1 with z15. If you are using Elliptic Curve in your protocol, for the best performance please use curves whose bit length is 256 or greater.

  • Guest
    Reply
    |     Nov 16, 2020

    .Thank you for your recommendation! We have added this into scenarios to address in future releases.

  • Guest
    Reply
    |     Aug 24, 2020

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - z Systems Hardware
    Product - z Systems Hardware
    Component - Crypto HW

    For recording keeping, the previous attributes were:
    Brand - Servers and Systems Software
    Product family - z Systems Hardware
    Product - z Systems Hardware
    Component - Security / Crypto

  • Guest
    Reply
    |     Apr 8, 2020

    In addition, we would need any appropriate changes to System SSL/ICSF made in order to expose this hardware support to the software stack.

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