crypto: ensure documented RSA-PSS saltLength default is used #781

Job	Run time
Build slim tarball	1m 34s
aarch64-linux: with shared libraries	24m 2s
x86_64-darwin: with shared libraries	50m 0s
x86_64-linux: with shared libraries	28m 9s
aarch64-darwin: with shared libraries	24m 59s
	2h 8m 44s

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