How to generate .key and .crt file from JKS file for httpd apache server

Question

I have the mycert.jks file only. Now i need to extract and generate .key and .crt file and use it in apache httpd server.

SSLCertificateFile /usr/local/apache2/conf/ssl.crt/server.crt 
SSLCertificateKeyFile /usr/local/apache2/conf/ssl.key/server.key 

Can anybody list the all steps to get this done. I searched but there is no concrete example to understand, mixed and matched steps.

Please suggest!

[EDIT] Getting error after following steps from below answer.

8/‎21/‎2015 9:07 PM] Sohan Bafna: 
    [Fri Aug 21 15:32:03.008511 2015] [ssl:emerg] [pid 14:tid 140151694997376] AH02562: Failed to configure certificate 0.0.0.0:4545:0 (with chain), check /home/certs/smp_c
    ert_key_store.crt
    [Fri Aug 21 15:32:03.008913 2015] [ssl:emerg] [pid 14:tid 140151694997376] SSL Library Error: error:0906D06C:PEM routines:PEM_read_bio:no start line (Expecting: TRUSTED
     CERTIFICATE) -- Bad file contents or format - or even just a forgotten SSLCertificateKeyFile?
    [Fri Aug 21 15:32:03.008959 2015] [ssl:emerg] [pid 14:tid 140151694997376] SSL Library Error: error:140DC009:SSL routines:SSL_CTX_use_certificate_chain_file:PEM lib 

Solution 1

Here is what I do,

First export the key :

keytool -importkeystore -srckeystore mycert.jks -destkeystore keystore.p12 -deststoretype PKCS12

For apache ssl certificate file you need certificate only:

openssl pkcs12 -in keystore.p12 -nokeys -out my_key_store.crt

For ssl key file you need only keys:

openssl pkcs12 -in keystore.p12 -nocerts -nodes -out my_store.key

Solution 2

.jks is a keystore, which is a Java thing

use keytool binary from Java.

export the .crt:

keytool -export -alias mydomain -file mydomain.der -keystore mycert.jks

convert the cert to PEM:

openssl x509 -inform der -in mydomain.der -out certificate.pem

export the key:

keytool -importkeystore -srckeystore mycert.jks -destkeystore keystore.p12 -deststoretype PKCS12

convert PKCS12 key to unencrypted PEM:

openssl pkcs12 -in keystore.p12  -nodes -nocerts -out mydomain.key

---

credits:

• https://security.stackexchange.com/questions/3779/how-can-i-export-my-private-key-from-a-java-keytool-keystore
• https://stackoverflow.com/questions/2640691/how-to-export-private-key-from-a-keystore-of-self-signed-certificate
• https://www.sslshopper.com/article-most-common-java-keytool-keystore-commands.html

Comments

[Sohan]

Not working , getting error

[exeral]

exported cert is DER format. added a step to convert it to PEM

[Sohan]

thnx, that may work i did not tried yet though

[dave_thompson_085]

keytool -exportcert -rfc writes in PEM format and doesn't need conversion. Alternatively once you have the p12, openssl pkcs12 -nokeys writes the entire cert chain in PEM, which is usually better for a server using OpenSSL (like httpd) if this cert is from a real CA rather than the keytool-default self-signed cert.

[GM Lucid]

note: The Alias can be the name of the certificate, if you know what the name was when it was exported. Wanted to mention that in case people were struggling to run the first command.

[cafebabe1991]

I am getting the following error when I ran the keystore command. ------------------------------ destination pkcs12 storepass and keypass are different.

[Sohan]

are you trying to set new password? what exactly you are trying to do? Check if you have similar problem, stackoverflow.com/questions/36197143/…

[cafebabe1991]

I guess pkcs12 supports same password for store and keystore. That worked.

[Sohan]

It is recommend to have the same password always. If this works, please upvote the answer

[cafebabe1991]

I am new to all this jks and truststore. Can we chat so I get my doubts cleared ? @sohan

[Sohan]

sure, i can try

[Sohan]

Let us continue this discussion in chat.

[Aleksandr Erokhin]

Please note that when exporting the key, the password for source and dest keystores should match. Otherwise you'll get: java.lang.Exception: The destination pkcs12 keystore has different storepass and keypass. Please retry with -destkeypass specified.

[Rafael Borja]

Thank you. I would just add the "--storepass <PASSWORD>", "--srcstorepass <PASSWORD> --deststorepass <PASSWORD>", and "-password pass:<PASSWORD>" for the 1st, 3rd and 4th commands, in case user need to use it in a script.