Verification of code signature with flexible constraints
US10491401B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 2017 |
| Grant date | Nov 26, 2019 |
| Priority date | — |
| Expiry date | Jun 7, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/3242
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Systems, apparatuses, and methods for signing, and verifying the signature of, code to be executed by a target device. An example method of determining a verification hash of a code image to be executed by a target device comprises receiving a header and code image, determining an image hash based on metadata and the code image, determining a fuses hash based on values of hardware fuses of the target device, determining an information hash based on information stored in memory, determining a verification hash based on the image hash, the fuses hash, and the information hash, verifying the verification hash against a code signature in the header, obtaining an unlock constant based on the verification hash, comparing the unlock constant with a stored predetermined value to unlock a memory region of the target device, and executing the code in the code image on the target device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.