crypto/internal/cryptotest: add tests for the cipher.Stream interface
This CL creates tests for the cipher.Stream interface in the new
cryptotest package. This set of tests is called from the tests of
implementations of the Stream interface e.g. ctr_test.go, ofb_test.go,
rc4_test.go, etc.
Updates #25309
Change-Id: I57204ef9f4c0ec09b94e88466deb03c6715e411d
Reviewed-on: https://go-review.googlesource.com/c/go/+/595564
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Filippo Valsorda <filippo@golang.org> Reviewed-by: Filippo Valsorda <filippo@golang.org> Reviewed-by: Russell Webb <russell.webb@protonmail.com>