How to digitally sign the message using digital certificate and BaseEnc

Discussion in 'Java' started by suresh123kiran, Aug 17, 2012.

  1. From: suresh123kiran <>

    Hi All ... I am working on webservices.... I need to digitally sign a message
    in which AcknowledgementNo using digital Certificate with X.509 certificate
    private key. I tried this code but it showing invalid signature Encoding. Can
    anyone pls us to digitally sign.
    Here is the below Java code to sign the AcknowledgementNo,Pls help me. Thanks
    in advance.

    public class DigiAckNo {
    static class PrivateKeyAndCertChain {
    public PrivateKey mPrivateKey;

    private static KeyStore loadKeyStoreFromPFXFile(String aFileName,
    String aKeyStorePasswd) throws
    IOException {
    String PKCS12_KEYSTORE_TYPE = "PKCS12";
    KeyStore keyStore = KeyStore.getInstance(PKCS12_KEYSTORE_TYPE);
    FileInputStream keyStoreStream = new
    char[] password = aKeyStorePasswd.toCharArray();
    keyStore.load(keyStoreStream, password);
    return keyStore;

    private static PrivateKeyAndCertChain getPrivateKeyAndCertChain(
    KeyStore aKeyStore, String aKeyPassword)
    throws GeneralSecurityException {
    char[] password = aKeyPassword.toCharArray();
    Enumeration<String> aliasesEnum = aKeyStore.aliases();
    if (aliasesEnum.hasMoreElements()) {
    String alias = (String) aliasesEnum.nextElement();
    Certificate[] certificationChain = aKeyStore
    Certificate certificate509 =

    PrivateKey privateKey = (PrivateKey)
    PrivateKeyAndCertChain result = new
    result.mPrivateKey = privateKey;
    return result;
    } else {
    throw new KeyStoreException("The keystore is empty!");

    private static byte[] signAckno(PrivateKey aPrivateKey)
    throws GeneralSecurityException, IOException {
    Signature signatureAlgorithm = Signature
    String strAckNo = "41516019";

    byte[] ba = strAckNo.getBytes();

    byte[] digitalSignature = signatureAlgorithm.sign();
    // Display plain text and signature
    return digitalSignature;

    public static String encodeBase64(byte[] rawData2) {
    return Base64.encode(rawData2);

    public static void main(String args[]) throws GeneralSecurityException,
    IOException, CertificateException {
    String File = "d:\\projects\\GANGADHARAN.pfx";
    String pwd = "1235";
    KeyStore keyStore = loadKeyStoreFromPFXFile(File, pwd);
    PrivateKeyAndCertChain PrivateKeyAndCertChain =
    keyStore, pwd);
    PrivateKey aPrivateKey = PrivateKeyAndCertChain.mPrivateKey;
    byte[] bytestr = signDocument(aPrivateKey);
    String strDocumentBase64 = encodeBase64(bytestr);
    System.out.println("strDocumentBase64" + strDocumentBase64);



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    suresh123kiran, Aug 17, 2012
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  2. To: suresh123kiran
    From: Daniele Futtorovic <>

    Certificate with X.509 certificate private key.
    Where and how exactly does it show that? Is it an exception? Or the result of
    some processing? If the latter, what processing?

    What exactly are your requirements? Do you really just need the signature, or
    perhaps some kind of CMS envelope?


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    Daniele Futtorovic, Aug 18, 2012
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  3. To: suresh123kiran
    From: suresh123kiran <>

    Thanks for ur reply... As i am working on Income Tax (DIT) project. They have
    given third party wsdl.
    I need to get the response in which i need to sent four request parameter. One
    of which is signature.
    So i try to sign a "AcknowledgmentNo" it showing "Signature encoding
    errorUnable to process digital signature". The requirement for the signature
    parameter is "AcknowledgementNo digitally signed by digital certificate and
    after digitally signed it should be Base64 encoded".
    I need ur help whether i am doing correct in signature parameter. If so why it
    showing Signature Encoding Error.
    Is any other any to process the signature. If anyother information is needed to
    verify i can send to u.


    --- BBBS/Li6 v4.10 Dada-1
    * Origin: Prism bbs (1:261/38)
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    suresh123kiran, Aug 18, 2012
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