(Ruby) Change Password for Java KeyStore File

Demonstrates how to load a Java keystore, change the password, and save using the new password. If the Java keystore contains only trusted root certificates, then it's simply a matter of loading the JKS with the existing password, and then saving with a new password. If the JKS contains private key entries, then each private key entry must be re-keyed using the new password by calling the ChangePassword method.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# This requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

jks = Chilkat::CkJavaKeyStore.new()

oldJksPassword = "existingPassword"
newJksPassword = "newPassword"
jksPath = "/someDir/keyStore.jks"

# Load the Java keystore from a file.
success = jks.LoadFile(oldJksPassword,jksPath)
if (success != true)
    print jks.lastErrorText() + "\n";
    exit
end

# If the JKS contains private key entries, then each
# must be re-keyed with the new password by calling ChangePassword.
numPrivateKeys = jks.get_NumPrivateKeys()

i = 0
while i < numPrivateKeys

    success = jks.ChangePassword(i,oldJksPassword,newJksPassword)
    if (success != true)
        print jks.lastErrorText() + "\n";
        exit
    end

    i = i + 1
end

# Write the JKS using the new password for the JKS file's keyed digest.
success = jks.ToFile(newJksPassword,jksPath)
if (success != true)
    print jks.lastErrorText() + "\n";
    exit
end

print "Updated the password for the Java keystore file." + "\n";