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Informational 18 Bitcoin

Merge remote-tracking branch 'agent/benma-agent/factorysetup-trim-unused'

Public commit record

What the developer wrote

Authored by Marko Bencun

50/100 · Thin
Merge remote-tracking branch 'agent/benma-agent/factorysetup-trim-unused'
✓ Specific, descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
The short version

What changed, and why it matters

This commit trims the BitBox02 factory-setup firmware image by switching stored root attestation public keys from 65-byte uncompressed to 33-byte compressed secp256k1 keys, and by using a smaller static secp256k1 verification context instead of a full signing context. It also adds a self-test and a helper that computes the key identifier from the uncompressed form so existing host tooling keeps working. The changes are framed as a size-reduction/cleanup patch; there is no direct evidence in the commit of a security vulnerability being fixed.

Recommended action

Treat as a routine firmware size-reduction and dependency-cleanup change. Reviewers should verify that the new compressed-key table entries correspond exactly to the previous uncompressed keys (same X coordinate and correct parity byte), that `rust_secp256k1_pubkey_identifier` correctly handles both compressed and uncompressed inputs and produces the same SHA-256 digest as before, and that the static-context ECDSA verification still rejects malformed signatures and invalid public keys. No urgent security action is indicated by the diff alone.

Security signals we found

01

Change in trusted public-key table format and derivation logic

02

Switch to static/no-precomp secp256k1 verification context

03

Addition of secp256k1 self-test at boot

04

Refactoring of HMAC-SHA256 implementation dependency

Risk score

Why this scored 18/100

Our methodology →
Potential impact 2/30
Exploitability 1/25
Stealth signal 1/15
Affected reach 2/15
Confidence 8/10
Evidence quality 4/5
Human-validated context

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