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You can generate a secure shell (SSH) key pair for an Oracle Java Cloud Service instance on a UNIX or UNIX-like platform by using the ssh-keygen utility. Re: How to create AES128 encrypted key with openssl Sure, just get 128 bits of data from /dev/random and you have an AES 128 key that can be used to encrypt anything you like (and decrypt it too). But you can never make an SSL certificate out of such a key. While Encrypting a File with a Password from the Command Line using OpenSSL is very useful in its own right, the real power of the OpenSSL library is its ability to support the use of public key cryptograph for encrypting or validating data in an unattended manner (where the password is not required to encrypt) is done with public keys. Generating Public and Private Keys with openssl.exe To perform the following actions for Windows or Linux, you must have OpenSSL installed on your system. Generating the Private Key - Windows.

• Openssl Generate Certificate

In this article you’ll find how to generate CSR (Certificate Signing Request) using OpenSSL from the Linux command line, without being prompted for values which go in the certificate’s subject field.

Below you’ll find two examples of creating CSR using OpenSSL.

In the first example, i’ll show how to create both CSR and the new private key in one command.

And in the second example, you’ll find how to generate CSR from the existing key (if you already have the private key and want to keep it).

Both examples show how to create CSR using OpenSSL non-interactively (without being prompted for subject), so you can use them in any shell scripts.

Create CSR and Key Without Prompt using OpenSSL

Openssl Generate Certificate

Use the following command to create a new private key 2048 bits in size example.key and generate CSR example.csr from it:

Generate CSR From the Existing Key using OpenSSL

Use the following command to generate CSR example.csr from the private key example.key:

Automated Non-Interactive CSR Generation

The magic of CSR generation without being prompted for values which go in the certificate’s subject field, is in the -subj option.

The fields, required in CSR are listed below:

You’ve created encoded file with certificate signing request.

Now you can decode CSR to verify that it contains the correct information.

1. From your computer, run the ssh-keygen utility.

   Specify a filename for the private key. Also specify the RSA type and a size of 2048.

   The command format is: ssh-keygen -b 2048 -t rsa -f filename

   For example: ssh-keygen -b 2048 -t rsa -f mykey

2. When prompted, enter a passphrase for the private key, or press Enter to create a private key without a passphrase.

   Enter passphrase (empty for no passphrase): YourPassphrase

   Note:

   While a passphrase is not required, Oracle recommends using one as a security measure to protect the private key from unauthorized use. When you specify a passphrase, a user must enter the passphrase every time the private key is used.

3. If you provided a passphrase, enter it a second time when prompted.

The ssh-keygen utility creates two files:

• filename - The private key

• filename.pub - The public key

  Put the output of step 2 into the Public key box and the output of step 4 found in the privateRSA.key file into the Private key box6. Pem certificate format.