Generate Private Key From Certificate Keytool

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SSL Certificate CSR Creation for Java Based Web Servers.

  1. Generate Private Key From Certificate Keytool File
  2. Generate Private Key From Certificate Keytool Download
  3. Keytool Generate Keystore

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. The key pair is generated by using an algorithm of type RSA, with a default password of changeit.

Apr 27, 2016  First you need to combine the certificate and the private key using the command below. # openssl pkcs12 -export -in certificate.crt -inkey private.key -certfile certificate.crt -name 'mytomcatcertificate' -out keystore.p12 Next you will need to use the java keytool command to create the new keystore in JKS format. This will create a keystore.jks file containing a private key and your sparklingly fresh self signed certificate. 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. Create PKCS 12 file using your private key and CA signed certificate of it. You can use openssl command for this. Create JKS file using keytool command. Step 3 (Optional). Changing the password of private key file in keystore. More details from here as well. Step 4 (Optional). Jul 01, 2019  Create the private key keystore file. Export the certificate file from the private key keystore. Sends the certificate to the second person. Then, the second person normally does this task: Imports the certificate from the first person into their public key keystore.

Generate Private Key From Certificate Keytool

If you already have your SSL Certificate and just need to install it, see
SSL Certificate Installation :: Java Web Servers.

How to generate a CSR using Java Keytool

**NOTE: You must generate a new keystore through this process. If you try to install a new certificate to an old keystore your certificate will not work properly. Backup and remove any old keystores if necessary before beginning this process.

Recommended: Save yourself some time by using our new Java Keytool CSR Wizard to create your CSR with Keytool. Just fill in the details, click Generate, and paste your customized keytool command into your terminal.

If you prefer to roll your own keytool commands to generate your CSR, just follow our old instructions below:

Create a New Keystore

  1. You will be using the keytool command to create your new key-CSR pairing. Enter the following:

    keytool -genkey -alias server -keyalg RSA -keysize 2048 -keystore yourdomain.jks

    'Yourdomain' is the name of the domain you are securing. However, if you are ordering a Wildcard Certificate, do not include * in the beginning of the filename as this is not a valid filename character.

  2. You will be prompted for the DN information. Please note: when it asks for first and last name, this is not YOUR first and last name, but rather your domain name and extension(i.e., www.yourdomain.com). If you are ordering a Wildcard Certificate this must begin with *. (example: *.digicert.com)

  3. Confirm that the information is correct by entering 'y' or 'yes' when prompted. Next you will be asked for your password to confirm. Make sure to remember the password you choose.

Generate Private Key From Certificate Keytool File

Generate Your CSR with Your New keystore

  1. Next, use keytool to actually create the Certificate Signing Request. Enter the following:

    keytool -certreq -alias server -keyalg RSA -file yourdomain.csr -keystore yourdomain.jks

    Again, 'yourdomain' is the name of the domain you are securing. (without the * character if you are ordering a Wildcard Certificate).

  2. Enter the keystore password.

  3. Then the SSL Certificate CSR file is created. Open the CSR with a text editor, and copy and paste the text (including the BEGIN and END tags) into the DigiCert web order form.

  4. After you receive your SSL Certificate from DigiCert, you can install it.

    See SSL Certificate Installation :: Java Web Servers.

Generating a CSR for Issuance of an SSL Certificate with Keytool

How to generate a Certificate Signing Request for your Java Web Server

Generate Private Key From Certificate Keytool Download

To Create a CSR with keytool and Generate a SignedCertificate for the Certificate Signing Request

Keytool Generate Keystore

  1. Perform the following operations from the command line.


  2. Generate the Certificate Signing Request.


  3. Generate a signed certificate for the associated Certificate SigningRequest.


  4. Use the keytool to import the CA certificate into the client keystore.


  5. Use the keytool to import the signed certificate for the associatedclient alias in the keystore.


    Caution –

    The following error will be generated if there is no certificatechain in the client certificate.


    This error is because the CA’s certificate was not imported intothe KeyStore first. You must import theCA's certificate (step 4), then import the client.cer file itself to forma certificate chain (step 5).

    Now that we have a private key and an associating certificate chainin the KeyStore clientkeystore, we canuse it as a KeyStore for client (adapter)authentication. The only warning is that the CA certificate must be importedinto the trusted certificate store of the web server to which you will beconnecting. Moreover, the web server must be configured for client authentication(httpd.conf for Apache, for example).