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The crypto.Signer interface takes pre-hased messages for ECDSA and RSA,
but the argument in the implementations was called “msg”, not “digest”,
which is confusing.

This change renames them to help clarify the intended use.

Change-Id: Ie2fb8753ca5280e493810d211c7c66223f94af88
Reviewed-on: https://go-review.googlesource.com/70950

Reviewed-by: Filippo Valsorda <hi@filippo.io>