преобразовать CRT в PEM
openssl x509 -inform DER -in yourdownloaded.crt -out outcert.pem -text
Arrogant Ant
openssl x509 -inform DER -in yourdownloaded.crt -out outcert.pem -text
openssl x509 -outform der -in your-cert.pem -out your-cert.crt
openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile CACert.crt
openssl x509 -outform der -in your-cert.pem -out your-cert.crt