set the position of digital signature

[rakhi sinha]

I am using following code to create digitally signed pdf but signature is being displayed in left upper side .how to set the position of digital signature at a particular position.......

public class Signature {

		public static void main(String[] args)  throws 
	        IOException, DocumentException {
		Document document = new Document();
				KeyStore ks= null;
        try {
            ks = KeyStore.getInstance(KeyStore.getDefaultType());
        } catch (KeyStoreException ex) {
            Logger.getLogger(SEED.class.getName()).log(Level.SEVERE, null, ex);
        }
        try {
            ks.load(
            new FileInputStream("C:/../.keystore"),"abcdef".toCharArray());
        } catch (NoSuchAlgorithmException ex) {
            Logger.getLogger(SEED.class.getName()).log(Level.SEVERE, null, ex);
        } catch (CertificateException ex) {
            Logger.getLogger(SEED.class.getName()).log(Level.SEVERE, null, ex);
        }
		PrivateKey key= null;
        try {
            key = (PrivateKey) ks.getKey("foobar", "abcdef".toCharArray());
        } catch (KeyStoreException ex) {
            Logger.getLogger(SEED.class.getName()).log(Level.SEVERE, null, ex);
        } catch (NoSuchAlgorithmException ex) {
            Logger.getLogger(SEED.class.getName()).log(Level.SEVERE, null, ex);
        } catch (UnrecoverableKeyException ex) {
            Logger.getLogger(SEED.class.getName()).log(Level.SEVERE, null, ex);
        }
		Certificate[] chain= null;
        try {
            chain = ks.getCertificateChain("foobar");
        } catch (KeyStoreException ex) {
            Logger.getLogger(SEED.class.getName()).log(Level.SEVERE, null, ex);
        }
		PdfReader reader = new PdfReader("C:/../a.pdf");
		FileOutputStream os = new FileOutputStream("Signed.pdf");
		PdfStamper stamper = PdfStamper.createSignature(reader, os, '\0');
		PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
		appearance.setCrypto(key, chain, null,PdfSignatureAppearance.SELF_SIGNED);
		appearance.setReason("It's personal.");
		appearance.setLocation("Foobar");
		appearance.setVisibleSignature(new Rectangle(160, 732, 232, 780), 1, null);
		stamper.close();
		document.close();
	}
}

[Manish Sridharan]

Honestly speaking I know nothing about digital signature related APIs. however, i give it a glance on your code and saw at Line 43 , location of the signature are set. perhaps you can modify that as per your requirement.

Thanks,

[rakhi sinha]

Manish Sridharan wrote:Honestly speaking I know nothing about digital signature related APIs. however, i give it a glance on your code and saw at Line 43 , location of the signature are set. perhaps you can modify that as per your requirement.

Thanks,

thanks for your reply.... I have changed the code given in line 43 but only size is changing .....

[Manish Sridharan]

Are you sure you have changed the coordinates correctly ? try to set extreme coordinates like (10,20,0,0) . Have a look on Rectangle API in java.

Perhaps following links might help you.
1. Link_1
2. Link_2