Java Generate Key Pair Programmatically

| 08-05-2021
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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.

Generating a Key Pair and a Self-Signed Certificate

Nov 29, 2016  There are several ways to generate a Public-Private Key Pair depending on your platform. In this example, we will create a pair using Java. The Cryptographic Algorithm we will use in. I see you've already gone over to the BouncyCastle side of the house but just in case anyone else was wondering; you can add the cert chain to the entry when putting the key into the KeyStore. In some cases the key pair (private key and corresponding public key) are already available in files. In that case the program can import and use the private key for signing, as shown in Weaknesses and Alternatives. In other cases the program needs to generate the key pair. A key pair is generated by using the KeyPairGenerator class. Jan 09, 2017  In Asymmetric Cryptography example we discussed the use of Public Key Pair in Cryptography. Another important use of the Public Key Infrastructure is in Digital Signatures. Digital Signatures are the digital equivalent of handwritten signatures with one important difference; they are not unique but come as a product of the message. I see you've already gone over to the BouncyCastle side of the house but just in case anyone else was wondering; you can add the cert chain to the entry when putting the key into the KeyStore. Feb 27, 2020 To generate a key pair you have to enter the command: generateKeys algorithm=RSA size=1024 format=BINARY public=public.key private=private.key This will generate the public and the private keys and save them into the files public.key and private.key. The keys also remain loaded into the REPL application.

The genkey command of the keytool programenables you to generate a key pair.

To Generate a Key Pair and a Self-Signed Certificate

  1. Navigate to the JAVA_HOME/bin directory,where JAVA_HOME is the installation directory ofthe Java SDK.

  2. Enter the following command:


  3. When prompted, enter your keystore password.

  4. When prompted, enter the Distinguished Name information.

    1. What is your first and last name?

      Caution –

      When prompted for your first and last name, make sureyou enter the machine hostname.

    2. What is the name of your organizational unit?

    3. What is the name of your organization?

    4. What is the name of your City or Locality?

    5. What is the name of your State or Province?

    6. What is the two-letter country code for this unit?

    7. Is CN=first_and_last_name, OU=organizational_unit, O=organization_name,L=city_or_locality, ST=state_or_province, C=two_letter_country_codecorrect?

  5. When prompted, enter a password for the keystore entry.If the password is same as the keystore password, press Return.

    Note –

    Ifyou want to use a keystore, it is recommended to use the sbyn.keystore file in the JavaCAPS-install-dir/repository/repository/server directory.

Generate Key Code

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Java provides the KeyPairGenerator class. This class is used to generate pairs of public and private keys. To generate keys using the KeyPairGenerator class, follow the steps given below.

Step 1: Create a KeyPairGenerator object

The KeyPairGenerator class provides getInstance() method which accepts a String variable representing the required key-generating algorithm and returns a KeyPairGenerator object that generates keys.

Create KeyPairGenerator object using the getInstance() method as shown below.

Step 2: Initialize the KeyPairGenerator object

The KeyPairGenerator class provides a method named initialize() this method is used to initialize the key pair generator. This method accepts an integer value representing the key size.

Initialize the KeyPairGenerator object created in the previous step using this method as shown below.

Java Generate Key Pair Programmatically List

Step 3: Generate the KeyPairGenerator

You can generate the KeyPair using the generateKeyPair() method of the KeyPairGenerator class. Generate the key pair using this method as shown below.

Programmatically

Step 4: Get the private key/public key

You can get the private key from the generated KeyPair object using the getPrivate() method as shown below.

Java Generate Key Pair Programmatically

You can get the public key from the generated KeyPair object using the getPublic() method as shown below.

Example

Following example demonstrates the key generation of the secret key using the KeyPairGenerator class of the javax.crypto package.

Java Generate Key Pair

Output

Java Generate Key Pair Programmatically App

The above program generates the following output −