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build_library: pcr: document how to rerun measurements in bash

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Jeremi Piotrowski 2026-02-20 12:11:30 +01:00
parent 94a97299b8
commit cb972ccd23
1 changed files with 7 additions and 0 deletions
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7
build_library/precompute_pcr.py
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@ -49,6 +49,13 @@ PCR measurement details (SHA-256):
PCR 9:
Each source'd config file is measured as SHA-256(file_contents).
The loaded kernel is measured as SHA-256(kernel_file_contents).
Replay a single PCR from --print-hashes output using bash:
pcr=0000000000000000000000000000000000000000000000000000000000000000
while read -r digest; do
pcr=$(printf '%s%s' "$pcr" "$digest" | xxd -r -p | sha256sum | cut -d' ' -f1)
done < <(jq -r '.["4"][].value' pcr_hashes.json)
echo "pcr4: $pcr"
"""
import argparse