roll: third_party/pigweed/src ecf027d..2091e07 (32 commits) 2091e07:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/342652 roll: luci 5e1b45a:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/342532 roll: fuchsia-infra-bazel-rules 20fc84c..ba0f59b (56 commits) a79606e:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/340412 roll: python-wheel e0849ec:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/342272 pw_kernel: Standardize logging 9c0904e:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/342052 pw_log: Fix doc comment a69ab7a:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/341293 pw_async2: Channel BlockingSend and BlockingReceive 0c8beb6:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/341732 pw_digital_io: Fix docs typo, capitalization d397899:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/342032 docs: Fix RSS URLs b07381c:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/341492 pw_bluetooth_sapphire: Fix spec reference in comment 891adf6:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/341633 pw_async2: Avoid races when popping futures c6e8f66:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/341152 pw_bluetooth_sapphire: Update Fuchsia SDK 895e442:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/341292 pw_async2: Replace OneshotCallbackTask with FutureCallbackTask f77b536:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/340535 pw_async2: Remove RunUntilStalled() task arg; move code to Task 2d36d82:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/341552 uart_mcuxpresso/interrupt_safe: Acquire clock element dynamically 77ed350:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/337793 docs: Debugging relative paths in C++ toolchains (blog post) d54a08c:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/341112 size_report: Delete GN builds for size reports 849c9b6:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/340734 pw_kernel: Add a `nop` syscall 77fa72e:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/341332 pw_async2: Add missing tests to GN test group; fix shadowing errors 910cdc4:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/341212 pw_tokenizer: Take uint8 array or string instead of frame 0741a19:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/340992 pw_spi_mcuxpresso: Implement proper fix for fsl_spi_dma v2.2.2 1f42b7b:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/340754 pw_async2: Fix missing mutex include c1358d7:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/340656 cpp23: Replace std::aligned_storage_t b4f5bfa:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/277732 pw_tokenizer: Add support for nested detokenization in TypeScript 7fbe42b:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/339592 pw_snapshot: Add xtensa to CPU arch enum 4302888:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/340575 pw_snapshot: Don't assume unknown CPU arch is arm 12e8c1a:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/340634 pw_async2: Move futures out of experimental 5beaa3e:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/339792 pw_async2: Remove task execution mutex 51107a5:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/340433 pw_bluetooth_sapphire: Remove uncalled function cached_scan_results c3435af:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/340534 pw_async2: Move DoDestroy out of the base Task class fc42b65:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/340572 presubmit: Fix formatting of C++ files 8021817:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/340533 targets/rp2040: Replace use of deprecated pw::SystemStart function cc7ce71:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/340432 roll: fuchsia-infra-bazel-rules, MODULE.bazel.lock Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed Rolled-Commits: ecf027d02d7347..2091e07c81910a Roll-Count: 1 Roller-URL: https://cr-buildbucket.appspot.com/build/8698631945781305425 GitWatcher: ignore CQ-Do-Not-Cancel-Tryjobs: true Change-Id: I1da824976bf82170344d9ac7ac887d27bbd5111e Reviewed-on: https://pigweed-review.googlesource.com/c/open-dice/+/342872 Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com> Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com> Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
This repository contains the specification for the Open Profile for DICE along with production-quality code. This profile is a specialization of the Hardware Requirements for a Device Identifier Composition Engine and DICE Layering Architecture specifications published by the Trusted Computing Group (TCG). For readers already familiar with those specs, notable distinctives of this profile include:
You can find us (and join us!) at https://groups.google.com/g/open-profile-for-dice. We're happy to answer questions and discuss proposed changes or features.
The specification can be found here. It is versioned using a major.minor scheme. Compatibility is maintained across minor versions but not necessarily across major versions.
Production quality, portable C code is included. The main code is in dice.h and dice.c. Cryptographic and certificate generation operations are injected via a set of callbacks. Multiple implementations of these operations are provided, all equally acceptable. Integrators should choose just one of these, or write their own.
Tests are included for all code and the build files in this repository can be used to build and run these tests.
Disclaimer: This is not an officially supported Google product.
Different implementations use different third party libraries. The third_party directory contains build files and git submodules for each of these. The submodules must be initialized once after cloning the repo, using git submodule update --init, and updated after pulling commits that roll the submodules using git submodule update.
To setup the build environment the first time:
$ git submodule update --init --recursive $ source bootstrap.sh $ gn gen out
To build and run tests:
$ ninja -C out
The easiest way, and currently the only supported way, to build and run tests is from a Pigweed environment on Linux. Pigweed does support other host platforms so it shouldn't be too hard to get this running on Windows for example, but we use Linux.
There are two scripts to help set this up:
bootstrap.sh will initialize submodules, bootstrap a Pigweed environment, and generate build files. This can take some time and may download on the order of 1GB of dependencies so the normal workflow is to just do this once.
activate.sh quickly reactivates an environment that has been previously bootstrapped.
These scripts must be sourced into the current session: source activate.sh.
In the environment, from the base directory of the dice-profile checkout, run ninja -C out to build everything and run all tests. You can also run pw watch which will build, run tests, and continue to watch for changes.
This will build and run tests on the host using the clang toolchain. Pigweed makes it easy to configure other targets and toolchains. See toolchains/BUILD.gn and the Pigweed documentation.
The code is designed to be portable and should work with a variety of modern toolchains and in a variety of environments. The main code in dice.h and dice.c is C99; it uses uint8_t, size_t, and memcpy from the C standard library. The various ops implementations are as portable as their dependencies (often not C99 but still very portable). Notably, this code uses designated initializers for readability. This is a feature available in C since C99 but missing from C++ until C++20 where it appears in a stricter form.
The Google C++ Style Guide is used. A .clang-format file is provided for convenience.
To incorporate the code into another project, there are a few options:
Copy only the necessary code. For example:
Take the main code as is: include/dice/dice.h, src/dice.c
Choose an implementation for crypto and certificate generation or choose to write your own. If you choose the boringssl implementation, for example, take include/dice/utils.h, include/dice/boringssl_ops.h, src/utils.c, and src/boringssl_ops.c. Taking a look at the library targets in BUILD.gn may be helpful.
Add this repository as a git submodule and integrate into the project build, optionally using the gn library targets provided.
Integrate into a project already using Pigweed using the gn build files provided.
The build reports code size using Bloaty McBloatface via the pw_bloat Pigweed module. There are two reports generated:
Library sizes - This report includes just the library code in this repository. It shows the baseline DICE code with no ops selected, and it shows the delta introduced by choosing various ops implementations. This report does not include the size of the third party dependencies.
Executable sizes - This report includes sizes for the library code in this repository plus all dependencies linked into a simple main function which makes a single DICE call with all-zero input. It shows the baseline DICE code with no ops (and therefore no dependencies other than libc), and it shows the delta introduced by choosing various ops implementations. This report does include the size of the third party dependencies. Note that rows specialized from ‘Boringssl Ops’ use that as a baseline for sizing.
The reports will be in the build output, but you can also find the reports in .txt files in the build output. For example, cat out/host_optimized/gen/*.txt | less will display all reports.
This code does not itself use mutable global variables, or any other type of shared data structure so there is no thread-safety concerns. However, additional care is needed to ensure dependencies are configured to be thread-safe. For example, the current boringssl configuration defines OPENSSL_NO_THREADS_CORRUPT_MEMORY_AND_LEAK_SECRETS_IF_THREADED, and that would need to be changed before running in a threaded environment.
This code makes a reasonable effort to clear memory holding sensitive data. This may help with a broader strategy to clear sensitive data but it is not sufficient on its own. Here are a few things to consider.