Converting Certs from Different Formats

calendar2020-06-07 · 1 min read · sslcert tlscert cert-conversion  ·
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  • Convert a DER file (.crt .cer .der) to PEM
1openssl x509 -inform der -in certificate.cer -out certificate.pem
  • Convert a PEM file to DER
1openssl x509 -outform der -in certificate.pem -out certificate.der
  • Convert a PKCS#12 file (.pfx .p12) containing a private key and certificates to PEM
1openssl 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.
1openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile CACert.crt

More details in https://www.sslshopper.com/ssl-converter.html