[release/8.0-staging] Permit MD5 regardless of FIPS configuration for Linux #94979
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Tagging subscribers to this area: @dotnet/area-system-security, @bartonjs, @vcsjones Issue DetailsBackport of #94934 to release/8.0-staging /cc @vcsjones Customer ImpactTestingRiskIMPORTANT: If this backport is for a servicing release, please verify that:
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Backport of #94934 to release/8.0-staging
/cc @vcsjones @bartonjs
Customer Impact
Customers legitimately using the MD5 algorithm for non-cryptographic purposes get a
CryptographicExceptionon certain Linux configurations; including RHEL (with an opt-in) and Mariner (the new default?).The main known purpose for continuing to use MD5 is to set the Content-MD5 header required on uploading to Azure Blob Storage.
Testing
Verified by running the MD5 tests on a machine in this configuration. CI does not currently have such a configuration.
Risk
Low.
Customers not using MD5 are entirely unaffected. Customers using MD5 on a system without a FIPS lockout are verified by CI. Customers using MD5 on a system with a FIPS lockout are already broken, and have been manually verified as being unbroken.
The affected codepaths are initialization, they do not process arguments, so there are no argument-based edge cases.