Verify (authenticate) Digital Signature on R3

Hi,
I have a scenario where a pdf file(Digitally Signed) is to be verified for authentication.
1) Can it be validated on R3/portal system? If yes, Please explain in details....
2) Is there any other way of authenticating the pdf?
The requirement is urgent....
Thanks,
Prasanna.

Hai,
See this one may help you.
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/55ba9790-0201-0010-aa98-ce8f51ea93cd
Regards,
Naga

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Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code

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Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52)
How do I resolve this I have reinstalled iTunes but it still doesn't recognise my ipod

I reinstalled Itunes a couple of times. I unistalled all programs that I never use, I updated all of my drivers, Windows swept my computer and found no problems. I have a yellow causion lite when I look at the USB-port with the phone connected. All other devices work without a problem.

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Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52).
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See the driver topic of:
iOS: Device not recognized in iTunes for Windows
I would start with:
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7

Windows cannot verify the digital signature for the drivers required for this device. A recent hardw

windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is singned incorrectly or damaged, or that might be malicious software from unknown source (Code 52)

Hi,
What are you trying to do ? To help us answer question quicker, please read this:
http://h30434.www3.hp.com/t5/First-Time-Here-Learn-How-to/Welcome-Get-started-here/td-p/699035
Regards.
BH
**Click the KUDOS thumb up on the left to say 'Thanks'**
Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.

How to verify the digital signatures?

Buyer has to send a certified interactive form to vendor, vendor has to digitally sign the form back. We need to verify the signature of the vendor only then start processing the form. How do I achiev this security.
1) How do I generate buyer certificate and attach to the form.
2) I have created a signature field in the form, after the vendor signs it how do we check whether its the correct signature?
Kindly specify the steps.
Helpful answers will be rewarded.
Regards,
Vishal

Hi Vishal,
Check this Thread.
Implement Digital Signature in Interactive form
Regards,
Mithu

Verifying a Digital Signature

I have a smart card, which I am trying to use to digitally sign some bytes. Then I want to verify the signature using the public key which I can get from the certificate on the smart card.
I am able to send some bytes to the card (using an apdu) and get back some RSA signed bytes. But when I try to verify the signature, it always returns false.
To verify, I do:
X509Certificate x = ... //gets the certificate from the card
Signature sig = Signature.getInstance(x.getSigAlgName()); //"SHA1withRSA"
sig.initVerify(x.getPublicKey());
sig.update(dataBytes, 0, dataBytes.length);
boolean isSigned = sig.verify(signed);
As far as I can tell, this part is good.
I think my problem is related to how I am sending the bytes to the card to get signed. Sending dataBytes in plaintext returns errors regarding length. It seems the signing command I am using on the card wants the data to equal the key length (data=128 byte, key=1024 bit). So what I did next was an attempt to hash the data and then pad it before I send it to the card.
     MessageDigest md = MessageDigest.getInstance("SHA1");
     md.update(dataBytes);
     byte [] digest = md.digest();
     PKCS1SignaturePadding pkcs1 = new PKCS1SignaturePadding(PKCS1SignaturePadding.SHA1);
     byte [] padded = pkcs1.encode(digest, 128);
But after I sign, I try to verify the signature but it still returns false. I'm not sure if I'm doing something wrong or if I'm misunderstanding something (I'm relatively new to digital signatures and smart cards).

PKCS#7 SignedData objects are far more complex then it looks like you are taking them. First the PKCS#7 SignedData object will contain the OID for the message digest algorithm used and for the encryption algorithm used. From the looks of your code you are simply assuming MD5.
It also contains all of the data that was signed which is typically much more than just the document. It also of course contains the public keys and signatures which singed the document. In your case it will probably only have one public certificate and one signature.
Also note that a signature is an encrypted hash. Looking at your code I do not see you use encryption at all or rather for verification decryption.
Here is the basic process a signature takes.
MessageDigest md = MessageDigest.getInstance(algOID);
byte[] digest = md.digest(message.getBytes(charEncoding));
Cipher c = Cipher.getInstance("RSA/2/PKCS1Padding");
c.init(Cipher.ENCRYPT_MODE, priKey);
byte[] signature = c.doFinal(digest);Note that the resulting byte array is not the message digest but the encrypted message digest. You must use the corresponding public key to decrypt the signature to get the message digest value. It is because the trusted public key can decrypt the correct message digest that we know it was encrypted by the holder of the private key. It is because the decrypted message digest value is equal to my computed message digest value that we know the document has not be altered...
Now PKCS#7 SignedData does not take the message digest of the document, in your case your PDF. It creates a message digest on an ASN.1 object which includes the bytes of your document plus a bunch of meta data.
For more info on the exact format of a PKCS#7 signature file check out
http://www.rsasecurity.com/rsalabs/pkcs/pkcs-7/index.html
Look through this doucment for SignedData as a starting place and follow through all of the sub objects that make up a SignedData object. This will give you an idea of what is involved.

Verifying a Digital Signature using message digest

Hi, i am new to java.
I have a Digitally signed document, i wanna verify this signed document against the original one.
i got the idea from this link:
http://help.sap.com/saphelp_45b/helpdata/en/8d/517619da7d11d1a5ab0000e835363f/content.htm
i signed a pdf doc with my SmartCard. the third party signing tool passed me the PKCS7 digital signature and i stored it in database. the problem arose when i retrieved this digital signature from DB and verified against the original doc using the message digest method. the base64 result strings are always not equal.
I am sure about this:
-the retrieved digital signature was GOOD.
-the original doc was GOOD.
but why i can't get the same 2 message digests? can somebody please help?
below is part of my code:
while (rsetDs.next())
     InputStream DSName2 = rsetDs.getBinaryStream(1);
     ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
     byte[] myByte = Base64.decode(byteStream.toString());
     ByteArrayInputStream newStream = new ByteArrayInputStream(myByte);
     CertificateFactory cf = CertificateFactory.getInstance("X.509");
     Collection c = cf.generateCertificates(newStream2);
     Iterator i = c.iterator();
     while (i.hasNext())
          Certificate cert = (Certificate)i.next();
          X509Certificate cert1 = (X509Certificate)cert;
          try
               java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
               /*=============DB MD (BEGIN)==================*/
               byte [] pubkeyByte = cert1.getPublicKey().getEncoded();
               md.update(myByte);
               md.update(pubkeyByte);
               byte[] raw = md.digest();
               String db_md = Base64.encode(raw);
               /*============DB MD (end)============*/
               /*=============PDF MD (BEGIN)==================*/
               DataInputStream m_disFile = new DataInputStream(new FileInputStream("C:\\" + "original_doc.pdf"));
               int m_iNum = m_disFile.available();
               byte[] msgBytes = new byte[m_iNum];
               m_iNum = m_disFile.read(msgBytes, 0, m_iNum);
               md.update(msgBytes);
               byte[] digestMd = md.digest();
               md.reset();
               String pdf_md = Base64.encode(digestMd);
               /*=============PDF MD (END)==================*/
..thanks in advance.

PKCS#7 SignedData objects are far more complex then it looks like you are taking them. First the PKCS#7 SignedData object will contain the OID for the message digest algorithm used and for the encryption algorithm used. From the looks of your code you are simply assuming MD5.
It also contains all of the data that was signed which is typically much more than just the document. It also of course contains the public keys and signatures which singed the document. In your case it will probably only have one public certificate and one signature.
Also note that a signature is an encrypted hash. Looking at your code I do not see you use encryption at all or rather for verification decryption.
Here is the basic process a signature takes.
MessageDigest md = MessageDigest.getInstance(algOID);
byte[] digest = md.digest(message.getBytes(charEncoding));
Cipher c = Cipher.getInstance("RSA/2/PKCS1Padding");
c.init(Cipher.ENCRYPT_MODE, priKey);
byte[] signature = c.doFinal(digest);Note that the resulting byte array is not the message digest but the encrypted message digest. You must use the corresponding public key to decrypt the signature to get the message digest value. It is because the trusted public key can decrypt the correct message digest that we know it was encrypted by the holder of the private key. It is because the decrypted message digest value is equal to my computed message digest value that we know the document has not be altered...
Now PKCS#7 SignedData does not take the message digest of the document, in your case your PDF. It creates a message digest on an ASN.1 object which includes the bytes of your document plus a bunch of meta data.
For more info on the exact format of a PKCS#7 signature file check out
http://www.rsasecurity.com/rsalabs/pkcs/pkcs-7/index.html
Look through this doucment for SignedData as a starting place and follow through all of the sub objects that make up a SignedData object. This will give you an idea of what is involved.

USB "Windows cannot verify the digital signature" and No Audio in Notebook

Model: HP Pavilion DV6
OS: Windows 7 (64-bit)
I recently started to face this issue with the USB drivers and no audio from the internal speakers of my notebook.
ON checking the USB drivers, it says that Windows cant verify digital signature.
I uninstalled, restarted the notebook but the newly installed drivers have the same issue. Even tried to update the drivers, but to no avail.
I am even facing issue with no audio from internal speakers.
Uninstalled and reinstalled ATI High Def Audio Device and IDT High Def Audio CODEC - the drivers look good, but when I test sound in Control Panel - it fails to play test sound.
I have installed all Windows updates and the new HP Support Assistant and all other updates.
NOTHING works!
Please help!

I've got a temporary fix , but it sounds like you need a full recovery . After the HP/Compaq Screen flashes and disappears at startup , start pressing F8 like a boss (4 or 5 times) , you'll see a screen pop up with many options on it , near the bottom is one that says "disable driver signature requirement" or something similar . Arrow down and select that one , don't think it works after reboot , but like I said , it's just a temporary fix .
hope that helped
If it did hit me with some Kudos , I need all the help i can get .

"Windows cannot verify the digital signature for the drivers required for this device."

When I connect my iPod to my laptop, it only connects for about 10 seconds before disappearing. If I look at the iPod's properties in the Device Manager, it says:
Windows cannotverify the digital signature for the drivers required for this device. A recenthardware or software change might have installed a file that is signedincorrectly or damaged, or that might be malicious software from an unknownsource. (Code 52)

I would uninstall and reinstall the Apple software. See the following. The following also has a link for Win7/Vista
Removing and Reinstalling iTunes, QuickTime, and other software components for Windows XP

Attempting to verify a digital signature in JSSE

Situation: In a nutshell I cannot get signature verification to work, and I'm not sure what I'm doing wrong.
Background: I'm trying to recreate functionality in Java that currently exists in C/C++, using the OpenSSL vxcrypto library. I've written code to demonstrate the problem. The code below demonstrates what works in C, and what doesn't work in Java. In both cases, I read all of the input data (the public key, the SHA-1 hashed data that was previously signed by my private key, and the signature) as raw bytes from binary files. As you can see in the code, the Java program is reading this data from the exact same files as is the C program.
Signature: 128 bytes
Signed data: SHA-1 hashed to produce 20 bytes, with those 20 bytes being what was signed by my private key.
Public key: 162 bytes
This works fine:
* OpenSSLDemo.cpp
#include "stdafx.h"
#include <stdio.h>
#include <openssl/rsa.h>
#include <openssl/x509.h>
#define HASHED_DATA_SIZE   20
#define SIGNATURE_SIZE     128
#define PUBLIC_KEY_SIZE    162
* Proper error-checking and buffer guarding omitted for simplicity.
int main(int argc, char * argv[])
     * Allocate arrays to store the raw input bytes.
    unsigned char hashed_data[HASHED_DATA_SIZE];
    unsigned char signature[SIGNATURE_SIZE];
    unsigned char public_key[PUBLIC_KEY_SIZE];
     * Read the binary files into their respective arrays.
    FILE * fp = fopen("c:\\hasheddata.bin", "rb");
    if (HASHED_DATA_SIZE != fread(hashed_data, 1, HASHED_DATA_SIZE + 1, fp))
        printf("Read of hashed data was NOT exactly 20 bytes.\n");
    fclose(fp);
    fp = fopen("c:\\signature.bin", "rb");
    if (SIGNATURE_SIZE != fread(signature, 1, SIGNATURE_SIZE + 1, fp))
        printf("Read of hashed data was NOT exactly 128 bytes.\n");
    fclose(fp);
    fp = fopen("c:\\pubkey.bin", "rb");
    if (PUBLIC_KEY_SIZE != fread(public_key, 1, PUBLIC_KEY_SIZE + 1, fp))
        printf("Read of hashed data was NOT exactly 162 bytes.\n");
    fclose(fp);
     * Create OpenSSL RSA public key structure from my raw public key
     * bytes.
    RSA * rsa_struct_ptr = NULL;
    const unsigned char * public_key_pointer = public_key;
    if (NULL == d2i_RSA_PUBKEY(&rsa_struct_ptr, &public_key_pointer,
                               PUBLIC_KEY_SIZE))
        printf("Creation of RSA public key structure FAILED!\n");
        return -1;
     * Verify the signature against the hashed data that was previously
     * signed with my private key.
    if (!RSA_verify(NID_sha1, hashed_data, HASHED_DATA_SIZE,
                    signature, SIGNATURE_SIZE, rsa_struct_ptr))
        printf("Signature verification FAILED!\n");
        return 1;
    printf("Signature successfully verified.\n");
    return 0;
I have translated the above program to Java as follows:
import java.io.File;
import java.io.RandomAccessFile;
import java.security.KeyFactory;
import java.security.Signature;
import java.security.PublicKey;
import java.security.spec.X509EncodedKeySpec;
public class JSSEDemo
    public JSSEDemo()
    public static final void main(String [] args)
        // Thorough exception handling omitted for simplicity.
        try
            // Read raw data from files into respective byte arrays
            byte[] hashedData =
                new byte[(int) (new File("c:\\hasheddata.bin").length())];
            new RandomAccessFile("c:\\hasheddata.bin",
                                                 "rw").readFully(hashedData);
            assert(hashedData.length == 20);
            byte[] signature =
                new byte[(int) (new File("c:\\signature.bin").length())];
            new RandomAccessFile("c:\\signature.bin",
                                                "rw").readFully(signature);
            assert(signature.length == 128);
            byte[] publicKey =
                new byte[(int) (new File("c:\\pubkey.bin").length())];
            new RandomAccessFile("c:\\pubkey.bin", "rw").readFully(publicKey);
            assert(publicKey.length == 162);
            // Create java.security.PublicKey object from the publicKey
            // byte array.
            X509EncodedKeySpec x509PublicKeySpec =
                                           new X509EncodedKeySpec(publicKey);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            PublicKey pubKey = keyFactory.generatePublic(x509PublicKeySpec);
            assert(pubKey.getEncoded().length == 162);
            // Create java.security.Signature object and verify signature.
            Signature sig = Signature.getInstance("SHA1withRSA");
            sig.initVerify(pubKey);
            sig.update(hashedData);
            if (sig.verify(signature))
                System.out.println("Signature successfully verified.");
            else
                System.out.println("Signature verification FAILED!");
        catch(Exception exception)
            System.out.println(exception.toString());
And this Java one does not work, as the call to sig.verify() always returns false. Can anyone tell what I'm doing wrong?
- Michael

OK, I thought I'd post the answer in case anyone (most likely, OpenSSL users) ever has a similar problem and comes across this thread while searching the web or something:
Note that in the code samples I used the variable name hashed_data/hashedData to describe the actual data against which my signature needs to be verified. I called them that because the data in that variable is not the original text string, but rather the 20-byte result of SHA1 hashing that original text string. Of course, it is this 20-byte hash result that is the thing that actually gets signed, and then against which the signature is later verified.
Because of that, when you call RSA_verify in OpenSSL, you pass it not the original text string bytes, but rather the 20-byte SHA1 hash of that text string. That hash is what is actually going to be checked in the end, so that's what it expects as input. I was (erroneously) expecting the same thing in JSSE. Thus, when I called Signature.update() to give it the data to be verified, I gave it not the original text string bytes, but rather the 20-byte SHA1 hash of that text string, paralleling what I do in OpenSSL.
However, in JSSE, since you create your Signature object with "SHA1withRSA", it's smart enough to be able to accept the actual original text bytes and know to do the SHA1 hash on that for you. So since I had SHA1 hashed my string myself first, then passed that hash result into update(), my data ultimately got hashed twice, and that's why the signature verification didn't work.
I don't see anything in the Signature javadoc that makes it explicitly clear that the SHA1 hash will be taken care of for you. However, I'll grant that this may simply be because doing it that way is actually what is intuitive. Had I not been coming out of a "this is how I did it in OpenSSL" background, I probably would have fully expected it to work exactly the way it does in JSSE, and never would have had a problem.
Oh well, at least the problem is solved. So I can say that I did get my $50 worth from Sun's paid support service.
8-)
- Michael

Installing ADE - cannot verify Adobe digital signature

On up-to-date 64-bit Windows 7 Home, I am unable to verify the software publisher when installing ADE 1.7.2, and so will not install the software. Both digitaleditions.exe (available via the ADE home page "Launch" button) and the "manual" install file setup.exe give warnings like so:
Do others experience the same message when trying to install ADE 1.7.2 on a clean system? Is there a certificate update I'm missing? Is the software really not recognizably signed?

Hi,
What are you trying to do ? To help us answer question quicker, please read this:
http://h30434.www3.hp.com/t5/First-Time-Here-Learn-How-to/Welcome-Get-started-here/td-p/699035
Regards.
BH
**Click the KUDOS thumb up on the left to say 'Thanks'**
Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.

How can you verify the digital signature inside a form?

I see Adobe has a separate solution called Echosign but how to use both forms and signature together?

Hi,
this is indeed possible.
You can check if the change value is larger than one character.
If so, the change value is pasted from the clipboard.
All you need is to add this Script (FormCalc) to the change event of your field.
if (Len($event.change) gt 1) then
$event.change = ""
endif

I can't run Itunes! After installing Itunes, I receive a message saying that Windows could not verify Apple's digital signature and it closes.

Pls HELP me! I can"t install it Itunes on any of my computers. After downloading it ( Run now or Saving it) it will no run because I keep receiving a message saying that Windows can not open this file because it could not verify Apple's Digital Signature. I have changed my internet security settings to allow downloads from unverified websites but it will not allow me to run Itunes. I had an older version of Itunes so I tried to install the update and it wouldn't work because so the same message about not being able to verify the digital signature. I uninstalled Itunes and Quicktime and all other Apple programs on my system. Then I tried to download it again... no luck the same message came up again. I then went to my other computer that NEVER HAD ANY APPLE software on it and tried to download Itunes. It gave me the same message. Please help me, I'm going crazy tring to figure this out.

I had this same issue occur today during update, searched and finally tracked to problem with windows registry. Used online version of windows registry tool "Fix It" (can also download portable version for offline check. I selected Apple updater utility from list to fix and it did it's thing. Returned to my downloaded 10 iTunes adn isntalled perfectly fine.
http://support.microsoft.com/mats/Program_Install_and_Uninstall
Good luck. Worked for me back up and running.

Verifying digital signatures in PDF documents

I'm working on verifying PDFs digital signatures.
I know that when a PDF is signed, a byterange is defined, the certificates get embedded, and from what i've read, the signed message digest and the timestamp are also stored in the PDF.
I already can extract the certificates and validate them. Now I'm trying to validate the pdf's integrity and my problem is I don't know where the signed message digest is located.
In this sample signed pdf (http://blogs.adobe.com/security/SampleSignedPDFDocument.pdf), I can clearly identify the digest since it is down below the embedded certificates: /DigestMethod/MD5/DigestValue/ (line 1520).
But that PDF sample seems to be from 2009, and I suspect the message digest is stored in a different way now, because I signed a PDF with Adobe Reader and I can't find any message digest field like the previous one. Can someone tell if the digests are now stored in a different way? Where are they located?
Anyway, for now I'm using that sample document, and trying to verify its integrity. I'm getting the document's bytes to be signed acording to the specified byterange, and digesting them with MD5 algorithm, but the digest value I get doesn't match with the one from the message digest field... Am I doing something wrong? Is the digest also signed with the signer's private key?
I appreciate any help.

You cannot rely on the digest to be in a certain place in PDF. If you want to manually verify the digest in a PDF signature here's what you need to do.
1. Open PDF in a Text Editor.
2. Find Signature Dictionary for your signature.
3. Get the Hex String which is the value of the /Contents entry in the Signature Dictionary.
4. Convert Hex String to binary string and discard trailing zeros. Remember that in a Hex string each byte is represented with two characters and the last one might be a zero. So, when you discard zeros make sure that what you get left has even number of bytes.
5. Use one of the commercially available BER Viewers (you can find free BER Viewers on the Web) to convert the binary string to ANSI.1 representation.
6. Analyze the BER-decoded PKCS#7 signature object (RFC 2315 describes it) and find the digest that you are looking for in it. It is an OCTET STRING.
If you want to programmatically validate a signature, you need to write code that does all that. Signature validation includes much more than checking the digest. You need to build chain, validate each certificate in the chain, check revocation for each certificate in the chain, etc. RFC 5280 is the guide what to do.
Good luck!

On windows 8 adobe touch reader, where do i get options to validate/verify digital signatures in pdf?

i have windows 8 OS in my laptop, i need to verify digital signatures present in my pdf. the steps to verify/validate them are-
1. Open the PDF file in PDF Reader.
2. Left-click on the Digital Signature field.
3. Click "Verify/Validate Signature".
4. Click "Signature Properties".
5. Click "Validate Signature or Verify Identity".
6. Add "Contact information for certificate owner:"
7. Click "Add to List".
8. Click "Close".
but i cannot find such options in adobe touch reader.
please help to verify the digital signatures.
thank you

Unfotunately, this functionality is not supported in current version of Adobe Reader Touch. But, we have noted down your feature request and we might consider it for our future releases.

Verify (authenticate) Digital Signature on R3

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