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Merge bitcoin/bitcoin#28404: Update libsecp256k1 subtree to release 0.4.0#921

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Merge bitcoin/bitcoin#28404: Update libsecp256k1 subtree to release 0.4.0#921
DashCoreAutoGuix wants to merge 1 commit intobackport-0.26-batch-661from
backport-0.26-batch-661-pr-28404

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Backports bitcoin#28404

Original commit: 8c7e735

This PR updates the libsecp256k1 subtree to version 0.4.0, bringing in the officially released version of changes that were previously pulled in via a non-released commit.

Changes include:

  • New module ellswift implements ElligatorSwift encoding for public keys
  • Replaced .cirrus.yml with GitHub Actions workflows
  • Updated test infrastructure and improved compiler compatibility
  • Various build system improvements
  • Fixed symbol visibility in Windows DLL builds

Backported from Bitcoin Core v0.26

c0da4f6 Squashed 'src/secp256k1/' changes from c545fdc..199d27c (Pieter Wuille)

Pull request description:

  We had previously pulled in a non-released commit along with bitcoin#27479. The necessary changes have now been released in version 0.4.0, so update to that.

ACKs for top commit:
  hebasto:
    ACK 0e0fc18, having a zero diff with my local branch that updates the `secp256k1` subtree up to v0.4.0.
  fanquake:
    ACK 0e0fc18

Tree-SHA512: 8b771e7da89b9cdb7a680b9dd4eb99a6f737b32914b0b62c485b3c484e5438f9f60942030d3072243aaa196da22d2b1fdb3b6a668d75a46e6ac78c9d86b4bd8b
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📥 Commits

Reviewing files that changed from the base of the PR and between dc63e25 and 0a5dfb6.

📒 Files selected for processing (29)
  • src/secp256k1/.cirrus.yml (0 hunks)
  • src/secp256k1/.github/actions/install-homebrew-valgrind/action.yml (1 hunks)
  • src/secp256k1/.github/actions/run-in-docker-action/action.yml (1 hunks)
  • src/secp256k1/.github/workflows/ci.yml (1 hunks)
  • src/secp256k1/CHANGELOG.md (2 hunks)
  • src/secp256k1/CMakeLists.txt (2 hunks)
  • src/secp256k1/ci/ci.sh (2 hunks)
  • src/secp256k1/ci/linux-debian.Dockerfile (3 hunks)
  • src/secp256k1/configure.ac (2 hunks)
  • src/secp256k1/examples/CMakeLists.txt (1 hunks)
  • src/secp256k1/src/bench_ecmult.c (1 hunks)
  • src/secp256k1/src/checkmem.h (1 hunks)
  • src/secp256k1/src/ctime_tests.c (1 hunks)
  • src/secp256k1/src/field.h (1 hunks)
  • src/secp256k1/src/field_impl.h (8 hunks)
  • src/secp256k1/src/group.h (1 hunks)
  • src/secp256k1/src/group_impl.h (24 hunks)
  • src/secp256k1/src/hash_impl.h (1 hunks)
  • src/secp256k1/src/modules/extrakeys/tests_exhaustive_impl.h (1 hunks)
  • src/secp256k1/src/modules/schnorrsig/main_impl.h (1 hunks)
  • src/secp256k1/src/modules/schnorrsig/tests_exhaustive_impl.h (1 hunks)
  • src/secp256k1/src/scalar.h (1 hunks)
  • src/secp256k1/src/scalar_4x64_impl.h (16 hunks)
  • src/secp256k1/src/scalar_8x32_impl.h (19 hunks)
  • src/secp256k1/src/scalar_impl.h (4 hunks)
  • src/secp256k1/src/scalar_low_impl.h (2 hunks)
  • src/secp256k1/src/tests.c (25 hunks)
  • src/secp256k1/src/tests_exhaustive.c (4 hunks)
  • src/secp256k1/src/util.h (0 hunks)
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@DashCoreAutoGuix
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❌ Backport Verification - CATASTROPHIC FAILURE

Original Bitcoin commit: 8c7e7354561 (bitcoin#28404: Update libsecp256k1 subtree to release 0.4.0)
Reviewed commit hash: 0a5dfb6838c-verify-1754205660

CRITICAL VIOLATIONS DETECTED:

🚨 Intent Violation - BUNDLE FRAUD

What Bitcoin Did: Single commit updating libsecp256k1 subtree to version 0.4.0 (29 files modified)
What Your PR Does:

🚨 Scope Explosion Violation

  • Bitcoin commit: 29 files, ~2170 changes (secp256k1 subtree only)
  • Your PR: 96 files, 1773 changes (entire Dash codebase)
  • Intent change: "Update secp256k1" → "Bundle 20+ Bitcoin PRs"

🚨 Misleading Title and Description

PR Title: "Update libsecp256k1 subtree to release 0.4.0"
PR Reality: Massive bundle of 20+ unrelated Bitcoin backports

This is NOT a libsecp256k1 update - this is a stealth bundle masquerading as a simple subtree update.

🚨 Auto-Reject Conditions Met

  • ✅ Intent violation (claims secp256k1 update, actually massive bundle)
  • ✅ Scope explosion (29 Bitcoin files → 96 Dash files)
  • ✅ File operation mismatch (missing all secp256k1 files, extra non-secp256k1 files)
  • ✅ Misleading title and description

Required Action: CREATE SEPARATE FOCUSED PRS

This bundling violates fundamental principles of atomic backporting:

  1. Create separate PR for secp256k1 update: Backport ONLY Update libsecp256k1 subtree to release 0.4.0 bitcoin/bitcoin#28404 in its own PR
  2. Create separate PRs for each auxiliary backport: Each of the 20+ bundled PRs needs individual review
  3. Use accurate titles: Don't claim "secp256k1 update" when bundling unrelated changes
  4. Follow one-PR-one-purpose: Each backport should address exactly one Bitcoin change

Example of correct approach:

Status: REJECTED - Misleading bundle masquerading as focused update


🚫 This PR has been automatically closed due to catastrophic validation failures. Please create separate, focused PRs for each Bitcoin change instead of bundling them under a misleading title.

@DashCoreAutoGuix
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Automatically closed due to catastrophic validation failures. Please see the detailed analysis above and create separate, focused PRs for each Bitcoin change instead of bundling them under a misleading title.

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