November 19, 2008 12:28am pst

1. hielo 210,225
2. logudotcom 183,525
3. b0lsc0tt 141,132
4. Ray_Pas... 98,287
5. jason1178 82,463
6. tedbilly 54,191
7. TheLearn... 48,265
8. mplungjan 46,587
9. lunadl 43,414
10. julianopolito 39,265
11. hernst42 36,784
12. naspinski 33,875
13. angelIII 32,125
14. ahoffmann 32,121
15. Zvonko 31,600
16. Squinky 30,550
17. meverest 29,875
18. erikTsomik 29,044
19. Roonaan 29,030
20. samtran0... 28,630
21. scrathcyboy 25,700
22. Xyptilon2 24,450
23. GreenGho... 23,475
24. raterus 23,165
25. prairiedog 22,300

1. hielo 218,225
2. logudotcom 191,075
3. b0lsc0tt 167,751
4. lunadl 118,526
5. jason1178 114,484
6. Ray_Pas... 98,287
7. TheLearn... 98,065
8. tedbilly 90,479
9. samtran0... 89,689
10. hernst42 87,372
11. mplungjan 83,319
12. Zvonko 56,300
13. angelIII 48,707
14. ahoffmann 47,199
15. DropZone 46,530
16. steelseth12 44,927
17. glcummins 41,864
18. nizsmo 40,218
19. julianopolito 39,265
20. Roonaan 37,635
21. erikTsomik 34,094
22. rdivilbiss 34,074
23. naspinski 33,875
24. meverest 33,375
25. objects 33,322

06.12.2008 at 03:11AM PDT, ID: 23478824

	[x] Attachment Details

[x]

The Solution Rating System

With so many solutions, how can you tell which solutions are most likely to help you and which ones are not? To provide you with a tool to use, we rate our solutions based on various elements that most accurately determine if a solution is a quality solution. To explain what factors affect the solution rating, here are the elements we take into consideration when formulating our solution rating.

The Grade of the Solution
The Zone Rank of the Expert Providing the Solution
The Number of Author and Expert Comments
The Number of Experts Contributing
The Feedback of the Community

Your Input Matters
Because of the way the system is set up, the most important variable in this equation is you. As a member of Experts Exchange, you are able to cast your vote on the quality of the solutions in regard to how complete, accurate, helpful and easy to understand each solution is. When you provide your feedback, each rating is adjusted accordingly. So, if you see a solution that has a poor rating that you think is a good solution, let us know by rating it. As you do, the rating will be adjusted and will become more accurate for other members of our site.

If you have any suggestions that you would like to make for our rating system, please ask a question in the Suggestions Zone of Community Support.

Thank you!

7.8

How to validate digital signature using .NET 2.0

Asked by re-aktiv in WebApplications, Microsoft Visual C#.Net, .NET Framework 2.x

Tags: C#, IE 6.0 and above

I'm creating web application using .NET Framework 2.0. One of the requirements is that the data entered by user should be signed using certificate issued by CA, before is submitted for further processing. Certificate is chosen by the user from Certificate Store. For that purpose I use JavaScript and CAPICOM to sign the data. Everything is OK on that part. Data is signed and submitted to the server. On the server side I need to first validate the user certificate and then validate signature.
1. Using X509Chain I'm unable to validate certificate. ChainStatus return following statuses
PartialChain: A certificate chain could not be built to a trusted root authority.
RevocationStatusUnknown: The revocation function was unable to check revocation for the certificate.
OfflineRevocation: The revocation function was unable to check revocation because the revocation server was offline.
2. How to validate digiatal signature using System.Security.Cryptography classes. I tried using RSACryptoServiceProvider. Code sample is bellow.

Does enyone know where is my error, and what am I doing wrong?
Can someone give me URLs with this topic?

Start Free Trial

         
           
             1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:

           
           
             1)
X509Certificate2 aCertificate = new X509Certificate2(UnicodeEncoding.Unicode.GetBytes(Signature)); 
X509Chain chain = new X509Chain();
chain.ChainPolicy.RevocationFlag = X509RevocationFlag.EntireChain;
chain.ChainPolicy.RevocationMode = X509RevocationMode.Online;
chain.ChainPolicy.UrlRetrievalTimeout = new TimeSpan(0, 1, 0);
chain.ChainPolicy.VerificationFlags = X509VerificationFlags.NoFlag;
bool chainIsValid = chain.Build(aCertificate);
 
2)
byte[] data = Encoding.Unicode.GetBytes(Data); //original data
SHA1 sha = new SHA1CryptoServiceProvider();
byte[] hash = sha.ComputeHash(data);
RSACryptoServiceProvider RSAP = (RSACryptoServiceProvider)aCert.PublicKey.Key; 
//aCert is X509Certificate2 from code above
RSAPKCS1SignatureDeformatter RSADeformatter = new RSAPKCS1SignatureDeformatter(RSAP);
RSADeformatter.SetHashAlgorithm("SHA1");
if (RSADeformatter.VerifySignature(hash, sig))
{
    return true;
}
else
{
    return false;
}

           
         

Keywords: How to validate digital signature using …

	Title
1	Security certificate revocation question…
2	CRL Certificate Revocation
3	the certificate in the signature cannot b…
4	Digital signatures
5	Windows media revocation and renew…
6	Offline Root Certificate Authority and A…

Loading Advertisement...

20080716-EE-VQP-32 / EE_QW_2_20070628

How to validate digital signature using .NET 2.0

Asked by re-aktiv in WebApplications, Microsoft Visual C#.Net, .NET Framework 2.x

Tags: C#, IE 6.0 and above

About this solution