How do I import an existing Java keystore (.jks) file into a Java installation?

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So, I am having trouble with LDAP. I have an integration test case that hopefully will work out, but it is currently running into LDAPS security issues with the SSL handshake.

I am able to connect to the LDAPS with Apache Directory Studio, and it has downloaded the keystore into a file "permanent.jks".

That's ok, but I want my integration test, which resides in Eclipse using a JRE, to be able to connect to the LDAP server using this keystore.

How can I take this keystore and import it into the JRE for its own use?

Ok, so here was my process:

keytool -list -v -keystore permanent.jks - got me the alias.

keytool -export -alias alias_name -file certificate_name -keystore permanent.jks - got me the certificate to import.

Then I could import it with the keytool:

keytool -import -alias alias_name -file certificate_name -keystore keystore location

As @Christian Bongiorno says the alias can't already exist in your keystore.

Installing Trusted Certificates into a Java Keystore, An existing private key and certificate generated by a trusted Not only must the unique private key be imported into the keystore, in some keytool -import -​keystore keystore.jks -alias root -file AddTrustExternalCARoot.crt Import the PKCS12 file into Java keystore: keytool -importkeystore -srckeystore server.p12 -destkeystore store.keys -srcstoretype pkcs12 -alias shared Finally, to complete the preparation of the Java keystore, perform the procedures for creating the server and client truststore described in the previous section.

You can bulk import all aliases from one keystore to another:

keytool -importkeystore -srckeystore source.jks -destkeystore dest.jks

How to install the trusted root into Java cacerts Keystore, How to install the trusted root into Java cacerts Keystore. jre /lib/security/ cacerts - storepass changeit -alias Root -import -file Trustedcaroot.txt. In this example I'll assume that you have just received a keytool certificate file from another person, and you want to import the information in that certificate file into your public keystore file. Java keytool import - Import a certificate into a public keystore. Assuming that you've been given a certificate file named "certfile.cer" which contains an alias named "foo", you can import it into a public keystore named "" with the following keytool import command:

to load a KeyStore, you'll need to tell it the type of keystore it is (probably jceks), provide an inputstream, and a password. then, you can load it like so:

KeyStore ks  = KeyStore.getInstance(TYPE_OF_KEYSTORE);
ks.load(new FileInputStream(PATH_TO_KEYSTORE), PASSWORD);

this can throw a KeyStoreException, so you can surround in a try block if you like, or re-throw. Keep in mind a keystore can contain multiple keys, so you'll need to look up your key with an alias, here's an example with a symmetric key:

SecretKeyEntry entry = (KeyStore.SecretKeyEntry)ks.getEntry(SOME_ALIAS,new KeyStore.PasswordProtection(SOME_PASSWORD));
SecretKey someKey = entry.getSecretKey();

Install a CA-signed SSL certificate with the Java keytool, Import existing keys and certificates, or an existing keystore, that will work in on any secure machine and then import the result, a *.jks file, to your Option 3: Convert an existing PKCS or PFX keystore to a Java keystore. Now, we’ll use the keytool command inside the java installation folder (in my case C:\Program Files\Java\jre1.8.0_201\bin to create the keystore and put all necessary files in there. The first command puts the root CA’s certificate into the keystore. Since the key store doesn’t exist, it will create it automatically:

Java “keytool import”: How to import a certificate into a keystore file , When you're working with Java public and private keys, there may be a time when someone else says, "Here is a certificate. Import it into your  Not only must the unique private key be imported into the keystore, in some instances the root CA certificate and any intermediate certificates (referred to as a certificate chain) must be included, and more importantly in the correct order. The keytool utility doesn't help much in the way of ensuring a valid order.

Java Keytool Commands, jks. Import a root CA certificate to an existing Java keystore: keytool -import -​trustcacerts -alias root -file root.crt -keystore  Generate a Java key pair and keystore: keytool -genkey -alias mydomain -keyalg RSA -keystore keystore.jks -keysize 2048. Generate a certificate signing request (CSR) for an existing Java keystore: keytool -certreq -alias mydomain -keystore keystore.jks -file mydomain.csr. Generate a keystore and self-signed certificate:

The Most Common Java Keytool Keystore Commands, Each certificate in a Java keystore is associated with a unique alias. When creating a Java keystore you will first create the .jks file that will initially only Import a root or intermediate CA certificate to an existing Java keystore or check out our Tomcat SSL Installation Instructions which use Java Keytool. Here are the instructions on how to import a SSL certificate into the Java Keystore from a PKCS12 (pfx or p12) file. Ensure nothing is in the keystore by executing: keytool -v -list -keystore mykeystore. Enter the PKCS12 password/passphrase for both the Source and Destination password. This entry was posted in Uncategorized and tagged java

  • I got it working but with an ammendment (if you would like to change your answer). In the import process, the part where you have "alias name" (BTW: not a great variable name with a space) this has to be an alias that does not already exist in the destination store. If you don't specify the alias it defaults to "1" -- you can use step 1 to list aliases from your destination before installing
  • In the last step (importing), I got the error keytool error: Keystore was tampered with, or password was incorrect even though the previous step (exporting), I can successfully finished with my password. Do you know why it is ?
  • @ThaiTran For future readers, when importing a cert make sure to use the target cert file's password, not the password used to create the cert in the first place. Also note that on many systems, the JDK is owned by root. If this is the case you need to execute the keytool -import command as root.
  • For other future readers that were receiving the IOException, the default password for cacerts is 'changeit'.
  • Ok this really did work. However my "permanent.jks" contained like 5 different certifcates. So after keytool -list -v -keystore permanent.jks.. cmd + f "alias" find all the aliases and export them one bye one. And then After 5 separate .cer files i was able to add them to cacerts (also one bye one following the help here). Thanks!
  • @mike what do you mean?
  • This is awesome.
  • You saved my life. Was not loading the keystore properly, until I came to your example. Pity that I can not give you 10000 points for that. Thank you very much!!
  • glad to help! your thanks is worth more than a few points :).
  • Hi bro, Your code worded well with SHA1RSA, could you help to load a KeyStore SHA256RSA, it says "Invalid keystore format".