/etc/ld.so.conf.d/openssl.conf
yum install openssl /etc/ssl/openssl.cnf
openssl
rand | s_client | passwd
openssl req
openssl rsa
openssl genrsa
openssl x509
openssl ca
openssl verify
openssl ec
openssl dgst
openssl pkcs12
openssl asn1parse
openssl help
.cer to .pem, openssl version
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