Generate Public Key From Private Key Keytool

Posted on 13.04.2020 by admin

Copy key from one keystore to another For example you can copy the key pair created in section 'Generate a public/private key pair and a self-signed certificate' with the following keytool command: keytool -importkeystore -srckeystore mystore.jck -destkeystore myotherstore.jks -srcstoretype jceks -deststoretype jks -srcstorepass mystorepass -deststorepass. In order for the runtime system to authenticate the signature, Ray's keystore needs to have the public key corresponding to the private key used to generate the signature. You supply this by sending Ray a copy of the certificate authenticating the public key. Keytool -export -alias clientprivate -keystore client.private -file temp.key -storepass clientpw And here's the command to insert the client's private key into its own keystore: keytool -import -noprompt -alias clientpublic -keystore client.public -file temp.key -storepass public We'll also extract and store the server's public key. Extracting public and private keys from a Java Key Store (JKS) Using the keytool utility, it is easy to extract the public key of an already created “public-private” key pair, which is stored in a. Sep 01, 2014 Generating Private and Public Key using keytool in Java In this post. Let's see how we can generate private and public key using keytool command line interface which comes bundled with Java. The various options of keytool can be seen with following command.

Keytool Generate Public Key From Private Key
Generate Public Key From Private Key Using Keytool
Generate Key With Openssl
Generate Public Key From Private Key Keytool Software

To Use `keytool` to Create a ServerCertificate

Run keytool to generate a new key pair in the defaultdevelopment keystore file, keystore.jks. This exampleuses the alias server-alias to generate a new public/privatekey pair and wrap the public key into a self-signed certificate inside keystore.jks. The key pair is generated by using an algorithm oftype RSA, with a default password of changeit. For moreinformation and other examples of creating and managing keystore files, readthe keytool online help at http://download.oracle.com/javase/6/docs/technotes/tools/solaris/keytool.html.

Note –

RSA is public-key encryption technology developed by RSA DataSecurity, Inc.

Keytool Generate Public Key From Private Key

From the directory in which you want to create the key pair, run keytool as shown in the following steps.

Generate the server certificate.
Type the keytool command all on one line:

Blur game license key generator. When you press Enter, keytool prompts you to enterthe server name, organizational unit, organization, locality, state, and countrycode.
You must type the server name in response to keytool’sfirst prompt, in which it asks for first and last names. For testing purposes,this can be localhost.
When you run the example applications, the host (server name) specifiedin the keystore must match the host identified in the javaee.server.name property specified in the file tut-install/examples/bp-project/build.properties.
Export the generated server certificate in keystore.jks intothe file server.cer.
Type the keytool commandall on one line:
If you want to have the certificate signed by a CA, read the exampleat http://download.oracle.com/javase/6/docs/technotes/tools/solaris/keytool.html.
To add the server certificate to the truststore file, cacerts.jks, run keytool from the directory where you createdthe keystore and server certificate.
Use the following parameters:

Information on the certificate, such as that shown next, will appear:
Type yes, then press the Enter or Return key.
The following information appears:

If a code signer does not yet have a suitable private key for signing the code, the key must first be generated, along with a corresponding public key that can be used by the code receiver's runtime system to verify the signature.

Since this lesson assumes that you don't yet have such keys, you are going to create a keystore named examplestore and create an entry with a newly generated public/private key pair (with the public key in a certificate).

Type the following command in your command window to create a keystore named examplestore and to generate keys:

You will be prompted to enter passwords for the key and keystore.

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Subparts of the keytool Command

Let's look at what each of the keytool subparts mean.

The command for generating keys is -genkey.
The -alias signFiles subpart indicates the alias to be used in the future to refer to the keystore entry containing the keys that will be generated.
The -keystore examplestore subpart indicates the name (and optionally path) of the keystore you are creating or already using.
The storepass value that you are promted for specifies the keystore password.
The keypass value that you are prompted for specifies a password for the private key about to be generated. You will always need this password in order to access the keystore entry containing that key. The entry doesn't have to have its own password. When you are prompted for the key password, you are given the option of letting it be the same as the keystore password.

Note: For security reasons you should not set your key or keystore passwords on the command line, because they can be intercepted more easily that way.

Generate Public Key From Private Key Using Keytool

Distinguished-Name Information

Generate Key With Openssl

If you use the preceding keystore command, you will be prompted for your distinguished-name information. Following are the prompts; the bold indicates what you should type.

Command Results

The keytool command creates the keystore named examplestore (if it doesn't already exist) in the same directory in which the command is executed. The command generates a public/private key pair for the entity whose distinguished name has a common name of Susan Jones and the organizational unit of Purchasing.

The command creates a self-signed certificate that includes the public key and the distinguished-name information. (The distinguished name you supply will be used as the 'subject' field in the certificate.) This certificate will be valid for 90 days, the default validity period if you don't specify a -validity option. The certificate is associated with the private key in a keystore entry referred to by the alias signFiles.

Self-signed certificates are useful for developing and testing an application. However, users are warned that the application is signed with an untrusted certificate and asked if they want to run the application. To provide users with more confidence to run your application, use a certificate issued by a recognized certificate authority.