How to import a certificate to Java Key Store (JKS)

[Saman]

1. First we need to prepare the private key and certificate in DER format. Usually we have them in plain format such as PEM as below.

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   -----BEGIN CERTIFICATE-----
   MIIF1jCCBL6gAwIBAgIHKzDzMq1TIjANBgkqhkiG9
   .........
   .........
   w0BAQUFADCByjELMAkGA1UEkEPuDa6PsFscQA==
   -----END CERTIFICATE-----

   Say you have key.pem and cert.pem as your private key and certificate files (in PEM format).
   

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   openssl pkcs8 -topk8 -nocrypt -in key.pem -inform PEM -out key.der -outform DER
   openssl x509 -in cert.pem -inform PEM -out cert.der -outform DER

   Now you have key.DER and cert.DER created with you.
2. Next download the attached file.

   ImportKey.zip

   (3.97 KiB) Downloaded 378 times

   It includes both the source and a class file. You can use the class file for now.
3. Run the following command as below to import these files to JKS.

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   user@host:~$ java ImportKey key.der cert.der

   Output:

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   Using keystore-file : /home/user/keystore.ImportKey
   One certificate, no chain.
   Key and certificate stored.
   Alias:importkey  Password:importkey

   Now we have a proper JKS containing our private key and certificate in a file called keystore.ImportKey, using 'importkey' as alias and also as password. For any further changes, like changing the password we can use keytool.
4. You can change password using following commands.

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   keytool -storepasswd -keystore /root/keystore.ImportKey

   Enter importkey as current password and enter your new password 2 times.

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   keytool -keypasswd -alias importkey -keystore /root/keystore.ImportKey

   Enter the new password you put in the previous step, then enter importkey once. After that you are allowed the provide the new password. Enter the same two times.
5. Now you need to add certificate authority. Lets assume you use GoDaddy.
   Download the CA certificate using,

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   wget –no-check-certificate https://certificates.godaddy.com/repository/sf_issuing.crt

   Add that to your key file using following command.

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   keytool -import -alias intermed -file sf_issuing.crt -keystore /root/keystore -storepass changeit -trustcacerts

[Nipuna]

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