[release-branch.go1.12] crypto/rc4: remove false guarantees from Reset docs and deprecate it
Nothing in Go can truly guarantee a key will be gone from memory (see
#21865), so remove that claim. That makes Reset useless, because
unlike most Reset methods it doesn't restore the original value state,
so deprecate it.
Change-Id: I6bb0f7f94c7e6dd4c5ac19761bc8e5df1f9ec618
Reviewed-on: https://go-review.googlesource.com/c/162297
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
(cherry picked from commit
b35dacaac57b039205d9b07ea24098e2c3fcb12e)
Reviewed-on: https://go-review.googlesource.com/c/163438