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Implementation Guide: Signing Tools with SHA-256
A step-by-step guide to how the kernel signs tools with SHA-256 and updates the signature after the AST engine performs a repair.
When is the signature created?
After a tool is generated and verified successfully. A tool that fails verification is not signed as a trusted tool.
What happens if the code changes?
The signature changes. A changed signature means the code must be verified again before it can be trusted.
Is signing a substitute for verification?
No. Signing detects change; verification confirms the outcome. They are separate layers of the same security model.
Who updates the signature?
The AST engine updates the signature after it applies a repair to the code. The kernel then returns to a stable state.
What is the scope of signing?
Every tool is signed. The signature acts as a tamper-evident seal for the tool code.
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