Create and check certificates

Linux/MacOS OpenSSL

You can use MD5 module to check if key and cert are a keypair toghter.

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openssl rsa -modulus -noout -in <name>.key| openssl md5
openssl x509 -modulus -noout -in <name>.crt| openssl md5

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openssl x509 -in <name>.crt -text -noout

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openssl req -in <name>.csr -noout -text

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openssl x509 -in <path>/<name>.crt -noout -checkend 3888000