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公开(公告)号：US20220374530A1
公开(公告)日：2022-11-24
申请号：US17737570
申请日：2022-05-05
Applicant: STMICROELECTRONICS S.r.l.
Inventor： Rosalino CRITELLI
Abstract: A master device issues memory burst transaction requests via an interconnection bus to fetch data from a slave device. A cipher engine is coupled to the interconnection bus and decrypts the fetched data to produce plaintext data for the master device. The cipher engine selectively operates according to a stream cipher operation mode, or a block cipher operation mode. The cipher engine is configured to stall a read data channel of the interconnection bus between the slave device and the master device in response to the cipher engine switching from the block cipher operation mode to the stream cipher operation mode. The read data channel is reactivated in response to a last beat of a read burst of the plaintext data produced by the cryptographic engine.
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公开(公告)号：US20190278926A1
公开(公告)日：2019-09-12
申请号：US16296009
申请日：2019-03-07
Applicant: STMICROELECTRONICS S.R.L.
Inventor： Giuseppe GUARNACCIA , Rosalino CRITELLI
Abstract: A method for data decryption comprises receiving, over an AXI bus operating in burst mode, data access requests for data units stored in a memory, subdividing the requests received into requests for encrypted data units and requests for non-encrypted data units, forwarding both requests for encrypted data units and requests for non-encrypted data units towards the memory, retrieving the respective sets of data units over the AXI bus, and applying Advanced Encryption Standard, AES, processing to the requests for encrypted data units by calculating decryption masks for the encrypted data units and applying the decryption masks calculated to the encrypted data units retrieved. Subdividing the requests into requests for encrypted data units and requests for non-encrypted data units is performed depending on data start addresses and security information conveyed by the requests.
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