Manually depad RSAES-PKCS1 on Apple OSes

[bartonjs]

This provides a workaround for a behavioral change in the latest macOS update, to keep the platform behaving consistently (and tests passing on fully patched machines).

[ghost]

Tagging subscribers to this area: @dotnet/area-system-security, @bartonjs, @vcsjones
See info in area-owners.md if you want to be subscribed.

Issue Details

---

null

Author:	bartonjs
Assignees:	bartonjs
Labels:	area-System.Security
Milestone:	9.0.0

[ghost]

Tagging subscribers to 'os-ios': @steveisok, @akoeplinger, @kotlarmilos
See info in area-owners.md if you want to be subscribed.

Issue Details

---

This provides a workaround for a behavioral change in the latest macOS update, to keep the platform behaving consistently (and tests passing on fully patched machines).

Author:	bartonjs
Assignees:	bartonjs
Labels:	area-System.Security, os-ios
Milestone:	9.0.0

[vcsjones]

Jeremy and I have been talking about this one in another medium. But to translate over the commentary:

1. There is a lack of test coverage for this change. The existing rsaes-pkcs1-v1_5 tests are lacking.
2. Preliminary tests uncovered an issue.

[steveisok]

/azp run runtime-ioslike

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[bartonjs]

/backport to release/8.0-staging

[github-actions]

Started backporting to release/8.0-staging: https://github.com/dotnet/runtime/actions/runs/7893244443

[bartonjs]

/backport to release/7.0-staging

[bartonjs]

/backport to release/6.0-staging

[github-actions]

Started backporting to release/7.0-staging: https://github.com/dotnet/runtime/actions/runs/7893247431

[github-actions]

Started backporting to release/6.0-staging: https://github.com/dotnet/runtime/actions/runs/7893248395

[github-actions]

@bartonjs backporting to release/6.0-staging failed, the patch most likely resulted in conflicts:

$ git am --3way --ignore-whitespace --keep-non-patch changes.patch

Applying: Manually depad RSAES-PKCS1 on Apple OSes
Using index info to reconstruct a base tree...
M	src/libraries/Common/src/Interop/OSX/System.Security.Cryptography.Native.Apple/Interop.RSA.cs
M	src/libraries/Common/src/System/Security/Cryptography/RsaPaddingProcessor.cs
A	src/native/libs/System.Security.Cryptography.Native.Apple/entrypoints.c
A	src/native/libs/System.Security.Cryptography.Native.Apple/pal_rsa.c
A	src/native/libs/System.Security.Cryptography.Native.Apple/pal_rsa.h
Falling back to patching base and 3-way merge...
Auto-merging src/libraries/Native/Unix/System.Security.Cryptography.Native.Apple/entrypoints.c
Auto-merging src/libraries/Common/src/System/Security/Cryptography/RsaPaddingProcessor.cs
CONFLICT (content): Merge conflict in src/libraries/Common/src/System/Security/Cryptography/RsaPaddingProcessor.cs
Auto-merging src/libraries/Common/src/Interop/OSX/System.Security.Cryptography.Native.Apple/Interop.RSA.cs
CONFLICT (content): Merge conflict in src/libraries/Common/src/Interop/OSX/System.Security.Cryptography.Native.Apple/Interop.RSA.cs
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Manually depad RSAES-PKCS1 on Apple OSes
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".
Error: The process '/usr/bin/git' failed with exit code 128

Please backport manually!

[github-actions]

@bartonjs an error occurred while backporting to release/6.0-staging, please check the run log for details!

Error: git am failed, most likely due to a merge conflict.