Support of S/MIME Signing #162

Job	Run time
Test with Codecov coverage (ubuntu-latest / 1.23)	1m 0s
Dependency review	10s
Go vulnerabilities check	38s
golangci-lint (1.23)	37s
REUSE Compliance Check	17s
Test with SonarQube review (ubuntu-latest / 1.23)	51s
Test (macos-latest / 1.20)	39s
Test (macos-latest / 1.21)	34s
Test (macos-latest / 1.19)	34s
Test (macos-latest / 1.22)	35s
Test (macos-latest / 1.23)	35s
Test (ubuntu-latest / 1.19)	36s
Test (ubuntu-latest / 1.20)	42s
Test (ubuntu-latest / 1.21)	41s
Test (ubuntu-latest / 1.22)	40s
Test (ubuntu-latest / 1.23)	45s
Test (windows-latest / 1.19)	1m 18s
Test (windows-latest / 1.20)	2m 43s
Test (windows-latest / 1.22)	2m 47s
Test (windows-latest / 1.21)	2m 39s
Test (windows-latest / 1.23)	2m 40s
Test on FreeBSD 13.4'	2m 9s
Test on FreeBSD 14.0	2m 37s
Test on FreeBSD 14.1	2m 22s
	29m 9s

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