What are some common OpenSSL commands?

What are some common OpenSSL commands I should know?

Some common OpenSSL commands include:

1. openssl genrsa - Generate a private RSA key.
2. openssl req - Create a certificate signing request (CSR).
3. openssl x509 - Manage X.509 certificates.
4. openssl enc - Encrypt and decrypt files.

Can you show me how to generate a self-signed certificate?

Sure! You can generate a self-signed certificate using the following command:

openssl req -x509 -newkey rsa:2048 -keyout mykey.pem -out mycert.pem -days 365 -nodes

This command creates a new RSA key and a self-signed certificate valid for 365 days.

What does the -nodes option do?

The -nodes option stands for 'no DES'. It tells OpenSSL not to encrypt the private key, allowing it to be used without a passphrase.

How can I convert a PEM file to DER format?

You can convert a PEM file to DER format using the following command:

openssl x509 -in mycert.pem -outform der -out mycert.der