Decrypt bytes in asp.net

Question

Following is my Java applet code

KeyFactory keyFactory = KeyFactory.getInstance("RSA");
byte[] privKeyBytes = loadPriavteKeyFromFile(fileName, new String(txtPassword.getPassword()));
PKCS8EncodedKeySpec privSpec = new PKCS8EncodedKeySpec(privKeyBytes);
RSAPrivateKey privKey = (RSAPrivateKey) keyFactory.generatePrivate(privSpec);
Cipher rsaCipher = Cipher.getInstance("RSA");
rsaCipher.init(Cipher.ENCRYPT_MODE, privKey);
byte[] ciphertext = null;
ciphertext = rsaCipher.doFinal(xmlToSign.getBytes());
String urlString = "http://localhost:3290/SignApplet.aspx";
String senddata  = Base64.encodeBase64String(ciphertext);
doHttpUrlConnectionAction(urlString,senddata.getBytes());
JOptionPane.showMessageDialog(this, "XML successfully signed and sent to server.");

on the server side i am trying too decrypt the byte using the public key

byte[] b;
b = Request.BinaryRead(178);
string encodedbytes = new System.Text.UTF8Encoding().GetString(b);
b = Convert.FromBase64String(encodedbytes);
Debug.WriteLine("decrypted bytes:" + new System.Text.UTF8Encoding().GetString(b));
// The path to the certificate.
string Certificate = @"c:\certs\lafa801114sd3.cer";

//// Load the certificate into an X509Certificate object.
X509Certificate cert = new X509Certificate(Certificate);
RSACryptoServiceProvider publicprovider = (RSACryptoServiceProvider)CertUtil.GetCertPublicKey(cert);
byte[] decbytes = publicprovider.Decrypt(b, false);
Debug.WriteLine("decrypted bytes" + new System.Text.UTF8Encoding().GetString(decbytes));

can any one help in following exception which i am getting at byte[] decbytes = publicprovider.Decrypt(b, false); line

A first chance exception of type 'System.Security.Cryptography.CryptographicException' occurred in mscorlib.dll Key does not exist.

and the certificate is not installed in nay key store.Also i can successfully decrypt the data using Java servlet .

i am using asp.net vs2010 on windows 7 the public and private keys are stored in separate files

whay do i get exception that key does not exists?

Abdul Khaliq
– Abdul Khaliq

2011-01-22 14:28:40 +00:00
Commented Jan 22, 2011 at 14:28 — Abdul Khaliq
– Abdul Khaliq, Commented Jan 22, 2011 at 14:28

Community · Accepted Answer · 2017-05-23 10:33:08Z

2

Here are a few articles that might help you: Java RSA Encrypt - Decrypt .NET (which seems like what you are looking for) and http://www.jensign.com/JavaScience/dotnet/RSAEncrypt/

edited May 23, 2017 at 10:33

CommunityBot

11 silver badge

answered Jan 22, 2011 at 13:38

gbvb

8865 silver badges10 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

Abdul Khaliq Over a year ago

ok loaded the certificate file i get null for cert.CspKeyContainerInfo.KeyContainerName any ideas

gbvb Over a year ago

I dont know what you are looking for. I dont know the code that you have now. :) I would recommend getting the samples in the second example working with your key and then integrating it within your sources after that. It is hard to understand the issue just with a single line. :)

Abdul Khaliq Over a year ago

I am talking about the very first in the Decrypt code which states const string ContainerName = "{myCryptoAPIkeycontainername}" ; in link jensign.com/JavaScience/dotnet/RSAEncrypt the issue is that i cannot figure out what is the container name that I have to mention also when i load the the Certificate i and access the key-container (cert.CspKeyContainerInfo.KeyContainerName) property of certificate i get null.

Abdul Khaliq Over a year ago

I cannot understand why do i get exception Key does not exists when i try to decrypt the binary data

gbvb Over a year ago

This link msdn.microsoft.com/en-us/library/tswxhw92.aspx explains how the key container it talks about. It is the place to store the private key which you had used to encrypt the data. BTW: YOu should also see the other link from stackoverflow. That one is more clearer.

|

Collectives™ on Stack Overflow

Decrypt bytes in asp.net

1 Answer 1

6 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

6 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related