Friday Oct 04, 2013

Steps to create a .jks keystore using .key and .crt files...

How to create a .key and .crt file ?

If we already have a .key and .crt file how do we import them into a .jks keystore file ? 

How to convert a certificate from DER format to PEM format ? 

Keytool cannot import/export a private key into a keystore file.

To import a private key we need to use other tools like openssl.

We have seen situations when in we get a .key and .crt file from our vendors and we need to import the same into a .jks keystore to configure SSL with WLS.

Here .crt is the signed certificate from a CA and .key contains the private key.

To import these two files into a .jks keystore we can use the following command :

Syntax : $ java utils.ImportPrivateKey keystore storepass storetype keypass alias certfile keyfile keyfilepass

The ImportPrivateKey utility is used to load a private key into a private keystore file.

You can use the CertGen utility to create a .key ( testkey ) and .crt ( testcert ) and then use the ImportPrivateKey utility to create a .jks file.

Note: By default, the CertGen utility looks for the CertGenCA.der and CertGenCAKey.der files in the current directory, or in the WL_HOME/server/lib directory, as specified in the weblogic.home system property or the CLASSPATH.

Alternatively, you can specify CA files on the command line. If you want to use the default settings, there is no need to specify CA files on the command line.

1. Enter the following command to generate certificate files named testcert with private key files named testkey:

Command : $ java utils.CertGen -keyfilepass mykeypass -certfile testcert -keyfile testkey

2. Convert the certificate from DER format to PEM format.

Command :  $ java utils.der2pem CertGenCA.der

3. Concatenate the certificate and the Certificate Authority (CA).

Command :  $ cat testcert.pem CertGenCA.pem >> newcerts.pem

4. Create a new keystore named mykeystore and load the private key located in the testkey.pem file.

Command :  $ java utils.ImportPrivateKey -keystore mykeystore -storepass mypasswd -keyfile mykey -keyfilepass mykeypass -certfile newcerts.pem -keyfile testkey.pem -alias passalias

In this post we will see how to import a .crt and .key file into a .jks file.

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