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doc: clarify fips140 module version with GODEBUG=on #80330

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doc: clarify fips140 module version with GODEBUG=on #80330

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2 changes: 2 additions & 0 deletions doc/godebug.md
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Expand Up @@ -277,6 +277,8 @@ The possible values are:
- "on": the Go Cryptographic Module operates in FIPS 140-3 mode.
- "only": like "on", but cryptographic algorithms not approved by
FIPS 140-3 return an error or panic.
For `on` and `only`, the module version is controlled by the
`GOFIPS140` environment variable. By default it is `GOFIPS140=latest`.
For more information, see [FIPS 140-3 Compliance](/doc/security/fips140).
This setting is fixed at program startup time, and can't be modified
by changing the `GODEBUG` environment variable after the program starts.
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2 changes: 2 additions & 0 deletions src/cmd/go/alldocs.go
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2 changes: 2 additions & 0 deletions src/cmd/go/internal/help/helpdoc.go
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Expand Up @@ -744,6 +744,8 @@ Special-purpose environment variables:
The default is GOFIPS140=off, which makes no FIPS-140 changes at all.
Other values enable FIPS-140 compliance measures and select alternate
versions of the cryptography source code.
Valid values are off, latest, inprocess, certified, and versions
of the form v1.N.N.
See https://go.dev/doc/security/fips140 for details.
GO_EXTLINK_ENABLED
Whether the linker should use external linking mode
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