When you are working with JAVA applications and JAVA based server, you may need to configure a Java key store (JKS) file.Self signed keystore can be easily created with keytool command. But if you have a private key and a CA signed certificate of it, You can not create a key store with just one keytool command. You need to go through following to get it done. 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 create a private key and its corresponding public-key certificate using Java tools, you would do something like: $ keytool -genkeypair -keyalg rsa -keysize 2048 -alias jdavies -keystore jdavieskeys.jks -dname 'CN=Joshua Davies' $ keytool -certreq -alias jdavies -keystore jdavieskeys.jks jdaviescert.csr (get the CSR signed by a CA) $ keytool -import -alias jdavies. Apr 27, 2016 Use an existing private key to create a Java keystore April 27, 2016 Tags: java, tomcat, tls, security. You have generated a self signed certificate or a client gives you a certificate with a private key that was signed by the client's signing authority. Jan 17, 2019 In this tutorial, we demonstrate how to extract a private key from the Java KeyStore (JKS) in your projects using OpenSSL and Keytool. Extracting a Private Key From the Java Keystore (JKS) - DZone.
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1- Create PKCS#12 keystore (.p12 or .pfx file)
myKeystore.p12 = keystore filename. It can with .pfx extension as well.MY_PASSWORD = password used for the keystore and the private key as well.CN = commonName, it will be shown as certiciate name in certificates list.OU = organizationUnit, department name for example.O = organizationName, the company name.L = localityName, the city.S = stateName, the state.C = country, the 2-letter code of the country.Note: This step can be done using openssl but it's more complicated.
2- Create the public certificate (has the header -----BEGIN CERTIFICATE-----):
Using keytool:
Or using openssl:
Note: Import public-certificate.pem into browsers to trust it. Add it to 'Trusted Root Certification Authorities' certificate store.
3- Export the private key (has the header -----BEGIN PRIVATE KEY-----):
4- Export the public key from the private key (has the header -----BEGIN PUBLIC KEY-----):