By default, OpenSSL
files are created in PEM (Privacy Enhanced Mail) format. SSL files
that are created in Windows operating environments are created in
DER (Distinguished Encoding Rules) format.
Under Windows, you can
import a file that is created in either PEM or DER format. However,
a digital certificate that is created in DER format must be converted
to PEM format before it can be included in a trust list under UNIX.
Here is an example of
converting a server digital certificate from PEM input format to DER
output format:
OpenSSL> x509 -inform PEM -outform DER -in server.pem -out
server.der
Here is an example of
converting a server digital certificate from DER input format to PEM
output format:
OpenSSL> x509 -inform DER -outform PEM -in server.der -out server.pem