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Informational 18 Bitcoin

chore(core): remove sha1 from regular FW

Public commit record

What the developer wrote

Authored by M1nd3r

57/100 · Thin
chore(core): remove sha1 from regular FW

[no changelog]
✓ Descriptive subject✓ Names a concrete action or component✓ Uses a recognizable type or scope! No meaningful explanatory body
The short version

What changed, and why it matters

This commit removes the SHA-1 hashing function from the regular Trezor firmware. SHA-1 is an old, weak hash algorithm that is no longer considered secure for sensitive uses. The change deletes the code that exposes SHA-1 to apps running on the device, along with related tests and benchmarks. It is a hardening/cleanup change rather than a fix for an active bug or exploit.

Recommended action

Treat as a positive hardening change. Verify that no remaining firmware code paths still require SHA-1 (e.g., legacy protocols, HMAC-SHA1, PBKDF2-HMAC-SHA1, or bootloader/recovery flows) and that the underlying C SHA-1 implementation is also excluded from regular firmware builds if intended. Review downstream apps for any dependency on hashlib.sha1.

Security signals we found

01

Removal of a deprecated cryptographic primitive (SHA-1) from the firmware API surface

02

Reduction of attack surface and prevention of future misuse of a collision-vulnerable hash

03

No direct vulnerability patch or memory-safety bug is present in the diff

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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