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Before you can create your CSR, you need to create your Java keystore. Your Java keystore contains your private key. Run the following command to create your 2048 bit Java keystore: keytool -genkey -alias myalias -keyalg RSA –keysize 2048 -keystore c: yoursite.keystore 2. Note the alias you use here to create the keystore. The Java Keytool is a command line tool which can generate public key / private key pairs and store them in a Java KeyStore.The Keytool executable is distributed with the Java SDK (or JRE), so if you have an SDK installed you will also have the Keytool executable. Complete the following steps to create your CSR. Before you can create your CSR, you need to create your Java keystore. Your Java keystore contains your private key. Run the following command to create your 2048 bit Java keystore: keytool -genkey -alias myalias -keyalg RSA –keysize 2048 -keystore c:yoursite.keystore 2.

1. Keytool Generate Private Key From Certificate
2. Keytool To Generate Private Key For Putty
3. Keytool View Private Key

Java Keytool - Generate CSR

Java Keytool can be used to generate Java keystores, certificate signing requests (CSRs), convert certificate formats, and other certificate related functions. Keytool is bundled with Oracle's JDK. This article will walk through generating a CSR as well as generating a private key if one is not already available.

Keytool Generate Private Key From Certificate

1. Generate a keystore:

A keypair must first exist in order to generate a CSR. If you have an existing Java keystore, proceed to the next step, otherwise use the command below to generate a new Java keystore:
keytool -genkey -alias mydomain -keyalg RSA -keystore KeyStore.jks -keysize 2048
Enter keystore password: <create keystore password>
Re-Enter new password: <confirm keystore password>
You now have a Java keystore from which you can generate a CSR.
Note: You can change the Alias of mydomain to a word of your choosing. This alias must remain the same for key generation, CSR generation, and signed public key importing.

Keytool To Generate Private Key For Putty

2. Generate a CSR:

keytool -certreq -alias mydomain -keystore KeyStore.jks -file mydomain.csr
Answer each question when prompted.
Use the chart below to guide you through the process:

Confirm or reject the details by typing 'Yes' or 'No' and pressing Enter
Press Enter to use the same password as the keystore, alternatively specify a separate password and press enter.
You should now have a file called mydomain.csr which can be used to request a digital certificate from GlobalSign.

Securing your Java application with an SSL certificate can be extremely important. Fortunately, it is (usually) quite simple to do using Java Keytool. Most situations require that you buy a trusted certificate, but there are many cases when you can generate and use a self signed certificate for free.

When to Use a Keytool Self Signed Certificate

An SSL certificate serves two essential purposes: distributing the public key and verifying the identity of the server so users know they aren't sending their information to the wrong server. It can only properly verify the identity of the server when it is signed by a trusted third party. A self signed certificate is a certificate that is signed by itself rather than a trusted authority. Since any attacker can create a self signed certificate and launch a man-in-the-middle attack, a user can't know whether they are sending their encrypted information to the server or an attacker. Because of this, you will almost never want to use a self signed certificate on a public Java server that requires anonymous visitors to connect to your site. However, self signed certificates have their place:

Never use a self signed certificate on an e-commerce site or any site that transfers valuable personal information like credit cards, social security numbers, etc.

Keytool View Private Key

• An Intranet. When clients only have to go through a local Intranet to get to the server, there is virtually no chance of a man-in-the-middle attack.
• A Java development server. There is no need to spend extra cash buying a trusted certificate when you are just developing or testing an application.
• Personal sites with few visitors. If you have a small personal site that transfers non-critical information, there is very little incentive for someone to attack the connection.

Just keep in mind that visitors will see a warning in their browsers (like the one below) when connecting to a server that uses a self signed certificate until it is permanently stored in their certificate store.

Generate a Self Signed Certificate using Java Keytool

Now that you know when to use a Keytool self signed certificate, let's create one using a simple Java Keytool command:

1. Open the command console on whatever operating system you are using and navigate to the directory where keytool.exe is located (usually where the JRE is located, e.g. c:Program FilesJavajre6bin on Windows machines).
2. Run the following command (where validity is the number of days before the certificate will expire):
   keytool -genkey -keyalg RSA -alias selfsigned -keystore keystore.jks -storepass password -validity 360 -keysize 2048
3. Fill in the prompts for your organization information. When it asks for your first and last name, enter the domain name of the server that users will be entering to connect to your application (e.g. www.google.com)

This will create a keystore.jks file containing a private key and your sparklingly fresh self signed certificate. Generate license key for hana 2.0. Now you just need to configure your Java application to use the .jks file. If you are using Tomcat, you can follow our Tomcat SSL Installation Instructions.

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For more information on creating a Java Keytool Self Signed Certificate, see the following links:

Originally posted on Sat Oct 30, 2010

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