Make CBS/CBB-versions of crypto/asn1 types

I had hoped to do this incrementally, but X509_ALGOR contains an
ASN1_TYPE, so all types get imported at once. For now, these functions
are just wired up to tasn_dec.cc, but subsequent changes will read them
one-by-one.

For the parse convention, I opted for a caller-supplied output variable,
even though we've generally tried to avoid object reuse in the
caller-exposed d2i functions. At the level of core ASN.1 types, the
object reuse is hopefully manageable (and in practice I expect they'll
always be in the empty state). The motivation here is to let us
internally embed types into the X509, etc., structs and avoid the layers
of tiny allocations.

This does mean that the dispatch code inside ASN1_TYPE and the dispatch
code in tasn_dec.cc is no longer shared, but that sharing wasn't valid
by strict aliasing anyway. (Nothing in tasn_dec.cc is valid by strict
aliasing.)

Bug: 42290417
Change-Id: Idb6910e23f4fa4d01ee39ebcbf2ae09df14e87e3
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/81772
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
10 files changed
tree: f80f2ca34a7a71608a5f4119d2e0ac4bc50803c3
  1. .bcr/
  2. .github/
  3. cmake/
  4. crypto/
  5. decrepit/
  6. docs/
  7. fuzz/
  8. gen/
  9. include/
  10. infra/
  11. pki/
  12. rust/
  13. ssl/
  14. third_party/
  15. tool/
  16. util/
  17. .bazelignore
  18. .bazelrc
  19. .bazelversion
  20. .clang-format
  21. .gitignore
  22. API-CONVENTIONS.md
  23. AUTHORS
  24. BREAKING-CHANGES.md
  25. BUILD.bazel
  26. build.json
  27. BUILDING.md
  28. CMakeLists.txt
  29. codereview.settings
  30. CONTRIBUTING.md
  31. FUZZING.md
  32. go.mod
  33. go.sum
  34. INCORPORATING.md
  35. LICENSE
  36. MODULE.bazel
  37. MODULE.bazel.lock
  38. PORTING.md
  39. PrivacyInfo.xcprivacy
  40. README.md
  41. SANDBOXING.md
  42. STYLE.md
README.md

BoringSSL

BoringSSL is a fork of OpenSSL that is designed to meet Google's needs.

Although BoringSSL is an open source project, it is not intended for general use, as OpenSSL is. We don't recommend that third parties depend upon it. Doing so is likely to be frustrating because there are no guarantees of API or ABI stability.

Programs ship their own copies of BoringSSL when they use it and we update everything as needed when deciding to make API changes. This allows us to mostly avoid compromises in the name of compatibility. It works for us, but it may not work for you.

BoringSSL arose because Google used OpenSSL for many years in various ways and, over time, built up a large number of patches that were maintained while tracking upstream OpenSSL. As Google's product portfolio became more complex, more copies of OpenSSL sprung up and the effort involved in maintaining all these patches in multiple places was growing steadily.

Currently BoringSSL is the SSL library in Chrome/Chromium, Android (but it's not part of the NDK) and a number of other apps/programs.

Project links:

To file a security issue, use the Chromium process and mention in the report this is for BoringSSL. You can ignore the parts of the process that are specific to Chromium/Chrome.

There are other files in this directory which might be helpful: