Doc crypto #469

Job	Run time
audit	10s
all-features	1m 29s
afl-build	4m 49s
build (linux)	2m 2s
build (macos)	1m 53s
clippy	3m 39s
fmt	9s
long-tests	4m 7s
build (windows)	3m 39s
publish-dry-run	6s
test-bindings-c-cpp-linux	48s
test-bindings-c-cpp-windows (Debug-c, x86_64-pc-windows-msvc)	1m 19s
test-bindings-c-cpp-windows (Debug-c, i686-pc-windows-msvc)	1m 19s
test-bindings-c-cpp-windows (Release-c, x86_64-pc-windows-msvc)	1m 10s
test-bindings-c-cpp-windows (Release-c, i686-pc-windows-msvc)	1m 19s
test-bindings-c-cpp-windows (Debug-cpp, x86_64-pc-windows-msvc)	1m 12s
test-bindings-c-cpp-windows (Debug-cpp, i686-pc-windows-msvc)	1m 19s
test-bindings-c-cpp-windows (Release-cpp, x86_64-pc-windows-msvc)	1m 7s
test-bindings-c-cpp-windows (Release-cpp, i686-pc-windows-msvc)	1m 10s
	32m 46s

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