[v8.x backport] crypto: expose ECDH class
Backport of #8188 and #15662 for v8.x. Should also land cleanly on v6.x.
Note that the non-test commit in #8188 is rewritten so as to be back-portable.
/cc @MylesBorins
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Backport of #8188 and #15662 for v8.x. Should also land cleanly on v6.x.
Note that the non-test commit in #8188 is rewritten so as to be back-portable.
/cc @MylesBorins