OpenSSL #
Generating self-signed SSL certificates to be used in Nginx #
The same command works on macOS X.
openssl req -x509 -nodes -days 36500 -newkey rsa:2048 \
-keyout private-selfsigned.key -out public-selfsigned.crt
Discovering the sha256 of a file using openssl: #
openssl sha256 OperaSetup.zip
Converting a certificate from/to DER and PEM formats #
.cer: binary DER format
.crt: base64 PEM format
openssl x509 -inform DER -in certificate.cer -outform PEM -out certificate.crt
or
openssl x509 -inform PEM -in certificate.crt -outform DER -out certificate.cer