Merge pull request #192 from anhu/keystring_check #389

Job	Run time
Build wolfssl (ubuntu-latest, --enable-wolfclu --enable-experimental --enable-dilithium)	1m 41s
Build wolfssl (ubuntu-latest, --enable-wolfclu --enable-crl --enable-dsa --enable-pkcs7)	1m 34s
Build wolfssl (ubuntu-latest, --enable-wolfclu)	1m 40s
Build wolfssl (ubuntu-latest, --enable-all)	2m 20s
Build wolfssl (ubuntu-latest, --enable-wolfclu --enable-smallstack --enable-experimental --enable...	1m 35s
Build wolfssl (ubuntu-latest, --enable-wolfclu --enable-smallstack)	1m 34s
Build wolfclu (ubuntu-latest, --enable-wolfclu --enable-experimental --enable-dilithium)	30s
Build wolfclu (ubuntu-latest, --enable-wolfclu)	29s
Build wolfclu (ubuntu-latest, --enable-wolfclu --enable-smallstack --enable-experimental --enable...	28s
Build wolfclu (ubuntu-latest, --enable-wolfclu --enable-crl --enable-dsa --enable-pkcs7)	34s
Build wolfclu (ubuntu-latest, --enable-wolfclu --enable-smallstack)	32s
Build wolfclu (ubuntu-latest, --enable-all)	29s
	13m 26s

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