Generate X.509 Certificate (Self Signed)

User Private Key
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Self-Signed Certificate

A public-key certificate whose digital signature may be verified by the public key contained within the certificate. The signature on a self-signed certificate protects the integrity of the data, but does not guarantee the authenticity of the information. The trust of self-signed certificates is based on the secure procedures used to distribute them. Source(s): NIST SP 800-57 Part 1 Rev. 3

OpenSSL Commands

  • Generate a new private key and Certificate Signing Request

    openssl req -out CSR.csr -new -newkey rsa:2048 -nodes -keyout privatekey.key

  • Generate a self-signed certificate

    openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -keyout privatekey.key -out certificate.crt

  • Generate a certificate signing request (CSR) for an existing private key

    openssl req -out CSR.csr -key privatekey.key -new

  • Generate a certificate signing request based on an existing certificate

    openssl x509 -x509toreq -in certificate.crt -out CSR.csr -signkey privatekey.key

  • Remove a passphrase from a private key

    openssl rsa -in privateKey.pem -out newprivatekey.pem

  • Convert a DER file (.crt .cer .der) to PEM

    openssl x509 -inform der -in certificate.cer -out certificate.pem

  • Convert a PEM file to DER

    openssl x509 -outform der -in certificate.pem -out certificate.der

  • Convert a PKCS#12 file (.pfx .p12) containing a private key and certificates to PEM

    openssl pkcs12 -in keyStore.pfx -out keystore.pem -nodes

    You can add -nocerts to only output the private key or add -nokeys to only output the certificates.

  • Convert a PEM certificate file and a private key to PKCS#12 (.pfx .p12)

    openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile

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