Provide backpressure on crypto binary #5559

Job	Run time
miri	3m 6s
Basic Checks	19m 31s
Additional Builds and Concurrency Tests	13m 38s
Measure coverage	28m 36s
Release builds and tests	10m 8s
sanitize (address)	19m 19s
Slow tests	18m 5s
sanitize (address, multi-threading)	18m 26s
sanitize (leak)	7m 49s
sanitize (leak, multi-threading)	8m 4s
	2h 26m 42s

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