How to use OpenSSL to generate RSA public and private key pairs

If you want to use OpenSSL on Ubuntu, you need to install it first, the command is as follows:

sudo apt-get install OpenSSL

You can use OpenSSL when the installation is complete.

The first step is to enter OpenSSL's interface and enter OpenSSL at the command line;

1) Generate RSA private key:

Genrsa-out RSA_PRIVATE_KEY.PEM 1024

The command generates a 1024-bit private key, which generates a successful interface as follows:

At this point we can see the Rsa_private_key.pem file under the current path.

2) convert RSA private key to PKCS8 format
Input command Pkcs8-topk8-inform pem-in rsa_private_key.pem-outform pem–nocrypt, and enter
The result of a successful birth is a private key in the PKCS8 format, such as:

3) Generate RSA public key

Enter command rsa-in rsa_private_key.pem-pubout-out Rsa_public_key.pem, and enter,
Get the results of a successful build, such as:

At this point, we can see a file named Rsa_public_key.pem, open it, you can see-----begin public Key-----start,
-----End of the public key-----The string with no newline, this is the key.

How to use OpenSSL to generate RSA public and private key pairs