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George Adams (gdams) merged 2 commits into from
Oct 28, 2026
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doc: update OpenSSL 4 support details #2669

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f907901
doc: update OpenSSL 4 support details
dagood Oct 28, 2026
9d0c6b0
Remove duplicate OpenSSL preference list
dagood Oct 28, 2026
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1 change: 1 addition & 0 deletions eng/doc/SupportedPlatforms.md
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Expand Up @@ -29,6 +29,7 @@ The following OpenSSL versions are supported on Linux platforms:

- OpenSSL 1.1.1
- OpenSSL 3.x (built-in providers, or SymCrypt provider v1.6.1+)
- OpenSSL 4.x (built-in providers, or SymCrypt provider v1.6.1+) (since Go 1.28)

## Getting Help

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5 changes: 5 additions & 0 deletions eng/doc/fips/README.md
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Expand Up @@ -327,6 +327,7 @@ The `libcrypto` shared library file name varies among different platforms, so a

- The base name is always `libcrypto.so.`
- Well-known version strings are appended to the base name in this order:
- Since Go 1.28: `3` -> `4` -> `1.1` -> `11` -> `111`.
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- Since Go 1.25: `3` -> `1.1` -> `11` -> `111`.
- Prior to Go 1.25: `3` -> `1.1` -> `11` -> `111` -> `1.0.2` -> `1.0.0`.
- This may find multiple libraries installed on the machine, so to pick one:
Expand Down Expand Up @@ -461,6 +462,10 @@ A program running in FIPS mode can claim it is using a FIPS-certified cryptograp

This list of major changes is intended for quick reference and for access to historical information about versions that are no longer supported. The behavior of all in-support versions are documented in the sections above with notes for version-specific differences where necessary.

### Go 1.28 (Feb 2027)

- The OpenSSL backend supports OpenSSL 4.

### Go 1.27 (Aug 2026)

- Support for `GODEBUG=fips140=only` has been added. It acts as `fips140=on`, but also panics if a non-FIPS-approved algorithm is used.
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