Provide backpressure on crypto binary #1068

Job	Run time
Slow tests	18m 49s
Additional Builds and Concurrency Tests	15m 7s
Basic Checks	20m 27s
miri	4m 7s
Release builds and tests	10m 21s
sanitize (address)	18m 4s
Measure coverage	28m 55s
sanitize (address, multi-threading)	18m 18s
sanitize (leak)	7m 39s
sanitize (leak, multi-threading)	8m 14s
	2h 30m 1s

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