Hi,
I have succesfully signed ,also in append mode, a pdf file with visible
acrofield PdfSignatureApparence
Know Id want to make a form to show certificate information like
validity,issuer etc,like adobe acrobat reader certificate information.
All it works on adobe acrobat reader and the sign is valid and detailed.
I have seen that this is possible to extract certificate information with the
code:
PdfPKCS7 pk = af.verifySignature(name);
Calendar cal = pk.getSignDate();
but on the first line of code I receive the error
"SHA256 MessageDigest not available"
Can anyone help me?
below the code used to sign:
public static void signDetached(String src, String dest, boolean certified,
boolean graphic,int x,int y)
throws Exception {
PdfReader pdfReader= new PdfReader(src);
FileOutputStream fout = new FileOutputStream(dest);
PdfStamper stp = PdfStamper.createSignature(pdfReader, fout, '\0',
null, true);
PdfSignatureAppearance sap = stp.getSignatureAppearance();
stp.setFullCompression();
sap.setAcro6Layers(true);
//sap.setRender(PdfSignatureAppearance.SignatureRenderNameAndDescription);
sap.setReason("Reason");
sap.setSignDate(new GregorianCalendar());
y = y-32;//imposta l'angolo alto siistro del rettangolo come angolo
basso sinistro del cursore
//sig.setWidget(new Rectangle(x, y, x+72, y+50), null);
sap.setVisibleSignature(new Rectangle(x, y, x+72, y+50), 1, null);
sap.setLocation("Location");
sap.setExternalDigest(new byte[513], new byte[20], "RSA");
//sap.setContact(signerContact);
//sap.setImage(signatureImage);
KeyStore ke; // Well opened and initiated KeyStore
Security.addProvider(new BouncyCastleProvider());
String path = "D:\\Keystore\\myidentitykeystore.jks";
String keystore_password = "mypass";
String key_password = "mypass";
KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
ks.load(new FileInputStream(path),
keystore_password.toCharArray());
String alias = "myalias";
PrivateKey pk = (PrivateKey)ks.getKey(alias,
key_password.toCharArray());
Certificate[] chain = ks.getCertificateChain(alias);
sap.setCrypto(null, chain, null, null);
PdfSignature dic = new PdfSignature(PdfName.ADOBE_PPKLITE,
PdfName.ADBE_PKCS7_DETACHED);
dic.setDate(new PdfDate(sap.getSignDate()));
dic.setName("myname");
if (sap.getReason() != null) dic.setReason(sap.getReason());
if (sap.getLocation() != null) dic.setLocation(sap.getLocation());
sap.setCryptoDictionary(dic);
int csize = 4000;
HashMap exc = new HashMap();
exc.put(PdfName.CONTENTS, new Integer(csize * 2 + 2));
sap.preClose(exc);
CMSSignedDataGenerator generator = new CMSSignedDataGenerator();
generator.addSigner(pk, (X509Certificate)chain[0],
CMSSignedDataGenerator.DIGEST_SHA256);
ArrayList list = new ArrayList();
for (int i = 0; i < chain.length; i++) list.add(chain[i]);
CertStore chainStore = CertStore.getInstance("Collection", new
CollectionCertStoreParameters(list));
generator.addCertificatesAndCRLs(chainStore);
CMSProcessable content = new CMSProcessableRange(sap);
CMSSignedData signedData = null;
signedData = generator.generate(content, false, "BC");
byte[] pk2 = signedData.getEncoded();
byte[] outc = new byte[csize];
PdfDictionary dic2 = new PdfDictionary();
System.arraycopy(pk2, 0, outc, 0, pk2.length);
dic2.put(PdfName.CONTENTS, new
PdfString(outc).setHexWriting(true));
sap.close(dic2);
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