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go/doc/next/6-stdlib/99-minor/crypto/63405.md
Roland Shoemaker 509c11f3a3 crypto,crypto/x509: implement MessageSigner 
And use it in crypto/x509. This allows people to implement single-shot
signers which do the hashing themselves.

Fixes #63405

Change-Id: I038c2e10f77b050b6136c4c0a5b031cb416f59aa
Reviewed-on: https://go-review.googlesource.com/c/go/+/654375
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Roland Shoemaker <roland@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
2025-05-08 07:46:12 -07:00

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[MessageSigner] is a new signing interface that can be implemented by signers that wish to hash the message to be signed themselves. A new function is also introduced, [SignMessage] which attempts to update a [Signer] interface to [MessageSigner], using the [MessageSigner.SignMessage] method if successful, and [Signer.Sign] if not. This can be used when code wishes to support both [Signer] and [MessageSigner].