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OpenSSL

remove passphrase from private key

openssl rsa -in asdf.key -out asdf.key

show technical infos about private key

openssl rsa -in asdf.key -text

show certificate details

openssl x509 -in asdf.cert -text

generate CSR (length: 4096bit)

openssl req -newkey rsa:4096 -keyout asdf.key -out asdf.csr