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Mar 29, 2016  Generate Client and Server Keystores We start by creating a keystore for the server. Execute the following command in a terminal. This command generates a 2048-bit RSA key pair, which is valid for 365 days and stored under the alias server in the server.jks keystore file.

• Generate Public Key From Private Keytool
• Public Private Key Encryption
• How To Use Java Keytool

Java Keytool is a key and certificate management utility. It allows users to manage their own public/private key pairs and certificates. It also allows users to cache certificates. Java Keytool stores the keys and certificates in what is called a keystore. By default the Java keystore is implemented as a file. It protects private keys with a password. A Keytool keystore contains the private key and any certificates necessary to complete a chain of trust and establish the trustworthiness of the primary certificate.

Each certificate in a Java keystore is associated with a unique alias. When creating a Java keystore you will first create the .jks file that will initially only contain the private key. You will then generate a CSR and have a certificate generated from it. Then you will import the certificate to the keystore including any root certificates. Java Keytool also several other functions that allow you to view the details of a certificate or list the certificates contained in a keystore or export a certificate.

Simply fill out the form, click Generate, and then paste your customized Java Keytool command into your terminal. The Java keytool utility creates both your private key and your certificate signing request, and saves them to two files: yourcommonname.jks, and yourcommonname.csr. If at all possible I would consider creating a new keystore in OpenSSL and new keys rather than trying to pry out the private key from the Java keystore. By opening the Java keystore and extracting the private key one is moving beyond the designed security features. To Use keytool to Create a Server Certificate. Run keytool to generate a new key pair in the default development keystore file, keystore.jks. This example uses the alias server-alias to generate a new public/private key pair and wrap the public key into a self-signed certificate inside keystore.jks. Dec 31, 2018. Alternatively once you have the p12, openssl pkcs12 -nokeys writes the entire cert chain in PEM, which is usually better for a server using OpenSSL (like httpd) if this cert is from a real CA rather than the keytool-default self-signed cert. – davethompson085 Oct 17 '16 at 14:58.

Note: For easier management of your Java Keystores (using a GUI) check out Portecle. If you need to buy a certificate, try to compare SSL with our SSL Wizard.

Below, we have listed the most common Java Keytool keystore commands and their usage:

Java Keytool Commands for Creating and Importing

These commands allow you to generate a new Java Keytool keystore file, create a CSR, and import certificates. Any root or intermediate certificates will need to be imported before importing the primary certificate for your domain.

• Generate a Java keystore and key pair
• Generate a certificate signing request (CSR) for an existing Java keystore
• Import a root or intermediate CA certificate to an existing Java keystore
• Import a signed primary certificate to an existing Java keystore
• Generate a keystore and self-signed certificate (see How to Create a Self Signed Certificate using Java Keytoolfor more info)

Java Keytool Commands for Checking

Generate Public Key From Private Keytool

If you need to check the information within a certificate, or Java keystore, use these commands.

• Check a stand-alone certificate
• Check which certificates are in a Java keystore
• Check a particular keystore entry using an alias

Other Java Keytool Commands

• Delete a certificate from a Java Keytool keystore
• Change a Java keystore password
• Export a certificate from a keystore
• List Trusted CA Certs
• Import New CA into Trusted Certs

Public Private Key Encryption

If you need to move a certificate from Java Keytool to Apache or another type of system, check out these instructions for converting a Java Keytool keystore using OpenSSL. For more information, check out the Java Keytool documentation or check out our Tomcat SSL Installation Instructions which use Java Keytool.

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How To Use Java Keytool

Originally posted on Sun Jul 13, 2008