(Objective-C) 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.

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#import <CkoJavaKeyStore.h>
#import <NSString.h>

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

CkoJavaKeyStore *jks = [[CkoJavaKeyStore alloc] init];

NSString *oldJksPassword = @"existingPassword";
NSString *newJksPassword = @"newPassword";
NSString *jksPath = @"/someDir/keyStore.jks";

// Load the Java keystore from a file.
BOOL success = [jks LoadFile: oldJksPassword path: jksPath];
if (success != YES) {
    NSLog(@"%@",jks.LastErrorText);
    return;
}

// If the JKS contains private key entries, then each
// must be re-keyed with the new password by calling ChangePassword.
int numPrivateKeys = [jks.NumPrivateKeys intValue];

int i = 0;
while (i < numPrivateKeys) {

    success = [jks ChangePassword: [NSNumber numberWithInt: i] oldPassword: oldJksPassword newPassword: newJksPassword];
    if (success != YES) {
        NSLog(@"%@",jks.LastErrorText);
        return;
    }

    i = i + 1;
}

// Write the JKS using the new password for the JKS file's keyed digest.
success = [jks ToFile: newJksPassword path: jksPath];
if (success != YES) {
    NSLog(@"%@",jks.LastErrorText);
    return;
}

NSLog(@"%@",@"Updated the password for the Java keystore file.");