公开(公告)号：US20230195477A1

公开(公告)日：2023-06-22

申请号：US18063984

申请日：2022-12-09

Applicant: Cryptography Research, Inc.

Inventor： Ashish Raj ,  Joel Wittenauer ,  Winthrop John Wu ,  Qinglai Xiao ,  Samatha Gummalla ,  Bryan Jason Wang

IPC: G06F9/445

CPC classification number: G06F9/445

Abstract: A computing system includes a host device and a root of trust (RoT) device for performing batch encryption and decryption operations facilitated by a direct memory access (DMA) engine. The host device generates a command table for batch processing of a set of address tables that each describe a set of data blocks of a file to be encrypted or decrypted. The DMA engine facilitates a DMA transfer of the command table from the host memory to an RoT memory of the RoT device. The RoT device then performs batch processing of the address tables referenced in the command table. For each address table, the DMA engine copies a set of data blocks from the host memory to the RoT memory, a cryptographic engine encrypts or decrypts the data blocks, and the DMA engine copies the transformed data blocks back to the host memory.

公开(公告)号：US11861374B2

公开(公告)日：2024-01-02

申请号：US18063984

申请日：2022-12-09

Applicant: Cryptography Research, Inc.

Inventor： Ashish Raj ,  Joel Wittenauer ,  Winthrop John Wu ,  Qinglai Xiao ,  Samatha Gummalla ,  Bryan Jason Wang

IPC: G06F9/445

CPC classification number: G06F9/445

Abstract: A computing system includes a host device and a root of trust (RoT) device for performing batch encryption and decryption operations facilitated by a direct memory access (DMA) engine. The host device generates a command table for batch processing of a set of address tables that each describe a set of data blocks of a file to be encrypted or decrypted. The DMA engine facilitates a DMA transfer of the command table from the host memory to an RoT memory of the RoT device. The RoT device then performs batch processing of the address tables referenced in the command table. For each address table, the DMA engine copies a set of data blocks from the host memory to the RoT memory, a cryptographic engine encrypts or decrypts the data blocks, and the DMA engine copies the transformed data blocks back to the host memory.