You need to programmatically create a public/private key pair using the RSA algorithm with a minimumkey strength of 2048 bits. The method you use to generate this key pair may differ depending onplatform and programming language.

• Openssl Generate Rsa Key Pair
• Openssl Generate Rsa Key Pair 2048 1

Generating a public/private key pair by using OpenSSL library

May 19, 2009  Know How to Generate 2048 bit CSR for your Server. To generate a CSR, you will need to create a key pair for your server. These two items are a digital certificate key pair and cannot be separated. Step 1: Generate a Key Pair The utility “openssl” is used to generate the key and CSR. This utility comes with the OpenSSL package and is. $ openssl rsa -pubout -in privatekey.pem -out publickey.pem writing RSA key A new file is created, publickey.pem, with the public key. It is relatively easy to do some cryptographic calculations to calculate the public key from the prime1 and prime2 values in the public key file. However, OpenSSL has already pre-calculated the public key.

The steps below are an example of the process for generating a public/private key pair for key exchange,using OpenSSL. To execute the following commands, you will need an OpenSSL runtime installed (whichyou can download and install from the OpenSSL website, or install one from your operating system’spackage management system).

1. Generate an RSA key pair with a 2048 bit private key, by executing the following command:
   'openssl genrsa - out private_key.pem 2048'
   The following sample shows the command:
2. Extract the public key from the RSA key pair, by executing the following command:
   'openssl rsa -pubout -in private_key.pem -out public_key.pem'
   The following sample shows the command:

   A new file, public_key.pem , is created with the public key.

3. Follow the instructions in the next (Validating your private key) section to confirm that your key meets the required criteria.

Validating your private key

Openssl Generate Rsa Key Pair

When a private key has been generated, you can use the following OpenSSL command to verify that theprivate key fits the required criteria.

1. Execute the following command:
   'openssl rsa -in private_key_sample.pem -text'
2. Verify that the first line of the output includes the private key strength:
   Private Key: (2048 bit)
   If the first line of output states “ unable to load Private Key ,” your private key is not a valid RSA private key.

Openssl Generate Rsa Key Pair 2048 1