How to programmatically sign test data?

Hello LV fans,
I’m looking for some ideas/methods to programmatically apply a digital signature to my test data. Currently I write to Excel, using ActiveX, then print and manually sign each data sheet. I’m open to new ideas to improve this process.
thanks

Hello Jared,
I'm not digitally signing my test reports now. I have to print them out, sign them, then have them scanned in for a permanent record. My VI pulls up the users' log in ID from the computer, and puts the users' name on the report. I'd like to take the process one step further and have each report digitally signed. Perhaps using MS Excel's digitial signature, or I could have the reports saved as pdf's and use Adobe Acrobat 8.0.
thanks..

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Message was edited by:
Gunther Stauch

Hmm...
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"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

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http://www.ni.com/devzone

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import java.io.*;
import java.math.BigInteger;
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        int bobLen;
        try {
            bobLen = bobKeyAgree.generateSecret(bobSharedSecret, 1);
        } catch (ShortBufferException e) {
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        bobLen = bobKeyAgree.generateSecret(bobSharedSecret, 0);
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          toHexString(aliceSharedSecret));
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        System.out.println("Shared secrets are the same");
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        bobKeyAgree.doPhase(alicePubKey, true);
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        aliceKeyAgree.doPhase(bobPubKey, true);
        SecretKey aliceDesKey = aliceKeyAgree.generateSecret("DES");
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//        Signature signature = Signature.getInstance("SHA1withDSA");
//        signature.initSign(bobKpair.getPrivate());
//        signature.update(cleartext);
//        byte[] data = signature.sign();
        byte[] ciphertext = bobCipher.doFinal(cleartext);
        Cipher aliceCipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        aliceCipher.init(Cipher.DECRYPT_MODE, aliceDesKey);
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        if (!java.util.Arrays.equals(cleartext, recovered))
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              "different from cleartext");
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            "same as cleartext");
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        bobCipher.init(Cipher.ENCRYPT_MODE, bobDesKey);
        cleartext = "This is just an example".getBytes();
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        byte[] encodedParams = bobCipher.getParameters().getEncoded();
        AlgorithmParameters params = AlgorithmParameters.getInstance("DES");
        params.init(encodedParams);
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            throw new Exception("DES in CBC mode recovered text is " +
              "different from cleartext");
        System.out.println("DES in CBC mode recovered text is " +
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}I want to sign the data with Signature,So i add the following code to the sample.
        byte[] cleartext = "This is just an example".getBytes();
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Error: java.security.InvalidKeyException: No installed provider supports this key: com.sun.crypto.provider.DHPrivateKey
What's wrong with the code, It seems that the bob's private key is not instance of DSAPrivateKey but DHPrivateKey.
what's your comment? thanks a lot.

slamdunkming wrote:
thank sabre150 for your reply. But the key pair is generated when I use DH to exchange the secret key. Yes! It is a DH key pair and cannot be used for signing. The DH key pair can only be used for secret sharing.
If I can not use this private key to sign the data, what can i do?Do I have to generate another key pair for signature? In that way, I will have two key pair. Yep. You can generate a DSA or an RSA key pair to be used for signing.
Because I use http protocol to exchange the key to get the shared secret key, Yep.
If I generate another key pair, how can i send the public key to server? Since public keys are 'public' then you can send them in the open to anyone you like. In fact, if you don't publish your public keys then they are pretty much a waste of time. The biggest problem one has with public key is proving 'ownership' - if someone sends me a public key how do I know that the sender is actually who they say they are?.
I am confused.Some reading might help. A pretty good starting point is "Beginning Cryptography with Java" by David Hook published by Wrox.

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Follow us on Twitter at @VZWSupport

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How to programmatically sign test data?

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