NTE_BAD_KEY - RSA Cryptography

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From: casey chesnut (casey_at_braSPAMins-N-braSPAMwn.com)
Date: 05/25/04 

Date: Tue, 25 May 2004 10:04:46 -0500

i've received a couple questions regarding RSA and this error.
for code like the following:

using OpenNETCF.Security.Cryptography;

RSACryptoServiceProvider rsa = new
RSACryptoServiceProvider(KeySpec.KEYEXCHANGE, true);
string txtPublicKey = rsa.ToXmlString(false);
string txtPrivateKey = rsa.ToXmlString(true);
string str = "this is some text to encrypt";
RSACryptoServiceProvider rsa1 = new RSACryptoServiceProvider();
rsa1.FromXmlString(txtPublicKey);
byte[] encryptedStrAsBytes =
rsa1.EncryptValue(Encoding.Unicode.GetBytes(str));
string encryptedStrAsString =
Encoding.Unicode.GetString(encryptedStrAsBytes, 0,
encryptedStrAsBytes.Length);
RSACryptoServiceProvider rsa2 = new RSACryptoServiceProvider();
rsa2.FromXmlString(txtPrivateKey);
byte [] decVal =
rsa2.DecryptValue(Encoding.Unicode.GetBytes(encryptedStrAsString));
string origVal = Encoding.Unicode.GetString(decVal, 0, decVal.Length);

this works for me on PPC 2003 emulator, and device, SP 2003 emu, and device.

chances are this is failing because you are on a PPC 2002 emulator,
because it does not have the high encryption pack installed.

the bNb.Sec.Context class has a property you can check:
bNb.Sec.Context.IsEnhanced

this will let you know if the Enhanced Crypto is installed on the device,
so that you can do pub/priv key encryption and signing.

Thanks,
casey
http://www.brains-N-brawn.com

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