COLDCARD firmware PR #691 patch
coldcard-firmware-pr-691-patch
- Organisation
- Coinkite
- Evidence role
- Repository patch
- Published
- not established
- Source changes
- 0
- Detected differences
- 1
- Unreviewed
- 0
- Copies held
- 2
Patch content for the open firmware-side full-digest proposal. Kept separately from the conversation and review-state capture.
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What changed from the previous capture 0 lines
Extracted text as captured
From 9324b130f4e30b852e1162a7390fbe75b2f37957 Mon Sep 17 00:00:00 2001 From: Ballance <[email protected]> Date: Fri, 31 Jul 2026 23:32:03 -0400 Subject: [PATCH] fix: feed full SE digest to PRNG reseed (drop 32-bit truncation) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit rng_seeding() hashed the secure-element entropy with SHA256d but then kept only n[0:4], handing ngu.random.reseed() a single 32-bit word. That throttled the secure-element contribution to 2**32 and, combined with reseed()'s old behaviour, left most of the generator state at fixed constants. Pass the whole 32-byte digest instead. Bumps external/libngu to a512174, which reworks random.reseed() to absorb a full-width seed into all generator state words. Ref: Block engineering disclosure, "Predictable RNG fallback and 32-bit reseed in COLDCARD firmware". Thirty-two silent bytes, all but four were cast aside — now the seed stays whole. --- external/libngu | 2 +- shared/mk4.py | 6 ++++-- 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/external/libngu b/external/libngu index 537519a8..a5121743 160000 --- a/external/libngu +++ b/external/libngu @@ -1 +1 @@ -Subproject commit 537519a829259622ea6b0334fbafd6cae852852f +Subproject commit a51217432308fd9ebc7c3d54b96a5af72b71b2e9 diff --git a/shared/mk4.py b/shared/mk4.py index 3a3e229d..8a4b1572 100644 --- a/shared/mk4.py +++ b/shared/mk4.py @@ -38,13 +38,15 @@ def make_psram_fs(): def rng_seeding(): # seed our RNG with entropy from secure elements - import callgate, ngu, ustruct + import callgate, nguExcerpt only. The complete copy is held offline and backs quotations on this site. The original publication remains the canonical public source.
1 presentation-noise difference. Sidebar, ticker and other page chrome churn that our review classified as not being a change to what the source says.
- +2 -2 Only the displayed Git patch index abbreviations gained one hexadecimal character. The patch content did not change.
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