COLDCARD firmware PR #707 patch
coldcard-firmware-pr-707-patch
- Organisation
- Coinkite
- Evidence role
- Repository patch
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- Source changes
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- Unreviewed
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Patch content for #707. Kept separately from the conversation and review-state capture.
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From f460ce3e6fc92772f7aada9709a53f6c0c805d88 Mon Sep 17 00:00:00 2001 From: scgbckbone <[email protected]> Date: Mon, 3 Aug 2026 19:07:13 +0200 Subject: [PATCH 1/7] Mix secure element entropy into seed generation --- releases/Next-ChangeLog.md | 2 ++ shared/seed.py | 12 +++++++++--- 2 files changed, 11 insertions(+), 3 deletions(-) diff --git a/releases/Next-ChangeLog.md b/releases/Next-ChangeLog.md index a1f1d1b1..82bb00f8 100644 --- a/releases/Next-ChangeLog.md +++ b/releases/Next-ChangeLog.md @@ -4,6 +4,8 @@ This lists the new changes that have not yet been published in a normal release. # Shared Improvements - Both Mk and Q +- Security Improvement: Master seed generation mixes entropy from both Secure + Elements with the STM32 TRNG (previously TRNG only). - Bugfix: Detect RNG_SR_SEIS and RNG_SR_SECS, retry safely, and fail closed on persistent faults. # Mk Specific Changes diff --git a/shared/seed.py b/shared/seed.py index e63feb84..4350cc0d 100644 --- a/shared/seed.py +++ b/shared/seed.py @@ -600,13 +600,19 @@ async def ephemeral_seed_generate_from_dice(nwords): await set_ephemeral_seed_words(words, origin='Dice') def generate_seed(): - # Generate 32 bytes of best-quality high entropy TRNG bytes. + # Generate 32 bytes of best-quality high entropy from independent sources. + import callgate seed = ngu.random.bytes(32) assert len(set(seed)) > 4 # TRNG failure - # hash to mitigate any possible bias in TRNG - return ngu.hash.sha256d(seed) + a = callgate.read_rng(1) # SE1 + b = callgate.read_rng(2) # SE2 + assert len(a) == 32 + assert len(b) == 8 + + # hash to combine the sources and mitigate any possible bias + return ngu.hash.sha256d(seed + a + b) async def make_new_wallet(nwords):Excerpt only. The complete copy is held offline and backs quotations on this site. The original publication remains the canonical public source.
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