# Generate a Private Key openssl genrsa -out privatekey.pem 2048 # Generate a self-signed certificate openssl req -new -x509 -key privatekey.pem -out self_signed_certificate.pem -days 365 # Convert PEM certificate to CER format openssl x509 -inform PEM -in self_signed_certificate.pem -outform DER -out self_signed_certificate.cer # Convert a PEM certificate to a PFX (PKCS#12) file openssl pkcs12 -export -out certificate.pfx -inkey privatekey.pem -in self_signed_certificate.pem # Extract a private key from a PFX file (contain bag attributes) # openssl pkcs12 -in certificate.pfx -nocerts -nodes -out privatekey_frompfx.pem openssl pkcs12 -in certificate.pfx -nocerts -nodes -out privatekey_frompfx.key # Extract a private key (no bag attributes) - identical to privatekey.pem openssl rsa -in privatekey_frompfx.key -out privatekey_frompfx.key # Extract public key from key pair openssl rsa -in privatekey_frompfx.key -pubout -out publickey.key #openssl rsa -in privatekey.pem -pubout -out publickey2.key # Convert CER to CRT openssl x509 -inform DER -in self_signed_certificate.cer -out self_signed_certificate.crt #openssl x509 -inform PEM -in self_signed_certificate.cer -out self_signed_certificate.crt # Convert CRT to CER openssl x509 -in self_signed_certificate.crt -outform DER -out self_signed_certificate2.cer ##### # Generate a Certificate Signing Request (CSR) - optional if going to generate a self-signed #openssl req -new -key privatekey.pem -out certificate_request.csr #openssl x509 -req -in certificate_request.csr -signkey privatekey.pem -out self_signed_certificate3.crt
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Wednesday, April 10, 2024
Useful openssl commands to generate certificates and keys
I hope the following will come handy when it comes to generating key pairs and certificates.
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