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Fri, 24 May 2019 07:04:01 +0000 (GMT) Subject: Re: another testmgr question To: Ard Biesheuvel , Pascal Van Leeuwen Cc: Eric Biggers , "linux-crypto@vger.kernel.org" From: Kamil Konieczny Message-ID: Date: Fri, 24 May 2019 09:04:00 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprMKsWRmVeSWpSXmKPExsWy7djP87pJ05/HGPydr2Px/8NuRou1e/4w W9y/95PJomv3MRYHFo/ONztZPTat6mTzuHNtD5vH501yASxRXDYpqTmZZalF+nYJXBkvlsQU bGOt6Nl9ga2BcTVLFyMnh4SAicT95eeYuhi5OIQEVjBKzPvUwQ7hfGGUuDd1FTOE85lR4snz FWwwLTuvPmKFSCxnlLjVuhzKecsosfXudyaQKmEBVYmD0zaDLRERSJZ4dOAWUDcHB7NAukT/ nkiQMJuAucSj7WfAynkF3CS+b97ACFLCAtS65a4aSFhUIELi/rENrBAlghInZz4Bm8gpECgx 8X4PM4jNLCAucevJfCYIW15i+9s5zBB3drNLrJphCWG7SMzc/I8JwhaWeHV8CzuELSPxf+d8 qHi5xNOFfWDfSwi0MEo8aP8IDSNricPHL7JCnK8psX6XPkTYUeL40k1gJ0sI8EnceCsIcQKf xKRt05khwrwSHW1CENW6EvP+n2GFsKUluv6vY53AqDQLyWOzkDwzC8kzsxD2LmBkWcUonlpa nJueWmycl1quV5yYW1yal66XnJ+7iRGYVE7/O/51B+O+P0mHGAU4GJV4eLvqn8UIsSaWFVfm HmKU4GBWEuGN3Q8U4k1JrKxKLcqPLyrNSS0+xCjNwaIkzlvN8CBaSCA9sSQ1OzW1ILUIJsvE wSnVwDglUfBNU+/WLFsO+ZZpi/oVNh0sdzw2ccbL3Bn7ePhPXdrm/zX+e8xBT23zrclH1U5p NOy3PJ/cvka0fPmz58nf1mXMj+XMmef/tnXL90Va+xUEpcRzJ31u9vl/tbdB8c6WBLb4DQFL n206xPCgVsSZ+8a9p5EzBdIcGuY08mx4FJVw0/LyRRslluKMREMt5qLiRAAUYoXbJgMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrBIsWRmVeSWpSXmKPExsVy+t/xe7qJ05/HGBxotLT4/2E3o8XaPX+Y Le7f+8lk0bX7GIsDi0fnm52sHptWdbJ53Lm2h83j8ya5AJYoPZui/NKSVIWM/OISW6VoQwsj PUNLCz0jE0s9Q2PzWCsjUyV9O5uU1JzMstQifbsEvYwXS2IKtrFW9Oy+wNbAuJqli5GTQ0LA RGLn1UesXYxcHEICSxklln54zg6RkJZoPL2aCcIWlvhzrYsNoug1o8SvF49ZQRLCAqoSB6dt BpskIpAscet2F1icWSBdYvOEz4wQDa+YJd6fWwiWYBMwl3i0/QzYVF4BN4nvmzcAFXFwsAAN 2nJXDSQsKhAhceb9ChaIEkGJkzOfgNmcAoESE+/3MEPMV5f4M+8SlC0ucevJfCYIW15i+9s5 zBMYhWYhaZ+FpGUWkpZZSFoWMLKsYhRJLS3OTc8tNtQrTswtLs1L10vOz93ECIylbcd+bt7B eGlj8CFGAQ5GJR7eB43PYoRYE8uKK3MPMUpwMCuJ8MbuBwrxpiRWVqUW5ccXleakFh9iNAX6 bSKzlGhyPjDO80riDU0NzS0sDc2NzY3NLJTEeTsEDsYICaQnlqRmp6YWpBbB9DFxcEo1MAZd XL3shfLfFF0h9tromvfaZ5JjrrTl+Ylk6PydZvWL88ai49OnBj0W4OKU3Pjyn9dqtfK9Svpz 5mqF/Yq7o7RMaP/Fmr2eDhuj5h6aWhNT4hu4wLQtPuxIcVj7yv6yzRuer/p8UZw3lcVv+bOr 8y0N7vZp88prvtCa1iFa7eTCpSzA5l1+VImlOCPRUIu5qDgRAO0YIqi7AgAA X-CMS-MailID: 20190524070402eucas1p2612b7719b36f305e6769db2f898bdc0c X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20190524052451epcas1p29029f5e2916daf9ade9c0c545886b432 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20190524052451epcas1p29029f5e2916daf9ade9c0c545886b432 References: <20190523185833.GA243994@google.com> <20190523200557.GA248378@gmail.com> Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org On 24.05.2019 07:24, Ard Biesheuvel wrote: > On Thu, 23 May 2019 at 22:44, Pascal Van Leeuwen > wrote: >> > [...] > In fact, given the above, I am slightly shocked that your hardware > does not handle empty messages correctly. [...] Imho hardware handles it in the way it was designed, for Exynos writing non-zero value to len message register starts hash/hmac. Writing zero and waiting for result will cause hang, as there will be no result ever. It can be done in HW to handle zero with additional register and more wires, but it was left to software driver as trivial case. -- Best regards, Kamil Konieczny Samsung R&D Institute Poland