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Mon, 24 Mar 2025 07:50:21 +0000 (GMT) Message-ID: Date: Mon, 24 Mar 2025 08:50:21 +0100 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: s390 hmac To: Herbert Xu , Harald Freudenberger , linux-s390@vger.kernel.org, Linux Crypto Mailing List References: Content-Language: de-DE, en-US From: Holger Dengler In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: r8LpRDNuZ-d2lfk8RlW_ZPpW5CvEbbeI X-Proofpoint-GUID: r8LpRDNuZ-d2lfk8RlW_ZPpW5CvEbbeI X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-24_03,2025-03-21_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 clxscore=1011 suspectscore=0 adultscore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 phishscore=0 malwarescore=0 mlxlogscore=999 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2503240053 Hi Herbert, On 23/03/2025 14:13, Herbert Xu wrote: > Hi Harald: > > I'm working on making the export format of hash algorithms compatible > so that you can switch between implementations seamlessly. > > I've got a question about the s390 hmac implementation. How does > the hardware tell if it's the first update (where the cv from the > param block contains undefined state) or not? Is it a bit in > s390_kmac_gr0 or is it the imbl? The bit s390_kmac_gr0.ikp indicates, if the instruction has processed the inner key padding or not. The bit is zeroed at init() and the first instruction call for a context will set this bit to 1 and update the cv. So, if this bit is 0, the cv in param block contains undefined state. > > Thanks, -- Mit freundlichen Grüßen / Kind regards Holger Dengler -- IBM Systems, Linux on IBM Z Development dengler@linux.ibm.com