Conversione da DER a PEM e viceversa

Conversione certificati X509 da DER file (.crt .cer .der) a PEM

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

Conversione certificati X509 da PEM file (.crt .cer .der) a DER

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