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Tue, 2 Apr 2024 19:30:14 +0000 (GMT) Message-ID: <2fb01074-e7a2-403c-8d46-d2b2323c231e@linux.ibm.com> Date: Tue, 2 Apr 2024 15:30:13 -0400 Precedence: bulk X-Mailing-List: keyrings@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 12/21] tpm: Add NULL primary creation To: =?UTF-8?B?R2FicsOtZWwgQXJ0aMO6ciBQw6l0dXJzc29u?= , Jarkko Sakkinen , James Bottomley , linux-integrity@vger.kernel.org Cc: keyrings@vger.kernel.org, Ard Biesheuvel References: <20240213171334.30479-1-James.Bottomley@HansenPartnership.com> <20240213171334.30479-13-James.Bottomley@HansenPartnership.com> <05c7d10b23e74269efd720eedbb1773931b0ad46.camel@system.is> Content-Language: en-US From: Ken Goldman In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: GMeB6XCmwZMmneqqs8nC2mHVyUaS0XXm X-Proofpoint-ORIG-GUID: GMeB6XCmwZMmneqqs8nC2mHVyUaS0XXm X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-04-02_12,2024-04-01_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 bulkscore=0 mlxlogscore=798 lowpriorityscore=0 adultscore=0 spamscore=0 malwarescore=0 mlxscore=0 phishscore=0 impostorscore=0 clxscore=1011 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2403210000 definitions=main-2404020143 On 3/31/2024 12:52 PM, Gabríel Arthúr Pétursson wrote: > The TPM specifications have a standardized set of templates for the > Endorsement Keys, and a recommendation on a template to > create/provision the shared SRK. The original TCG guidance document for an SRK used arrays of zeros for the unique field. This was either a holdover from TPM 1.2, where arrays were 20 bytes, or a misinterpretation of text that said: NULL. The reality is that it's a TPM2B, and the size(s) can be zero. The answer for the EK is different. It has to use the TCG standard. The EK is not a 'guidance document'.