Using C# I cannot import a public RSA key with an exponent of {1, 0, 0, 0, 15}: There is an exception:
System.Security.Cryptography.CryptographicException was caught
HResult=-2146893819
Message=Bad Data.
Source=mscorlib
StackTrace:
at System.Security.Cryptography.CryptographicException.ThrowCryptographicException(Int32 hr)
at System.Security.Cryptography.Utils._ImportKey(SafeProvHandle hCSP, Int32 keyNumber, CspProviderFlags flags, Object cspObject, SafeKeyHandle& hKey)
at System.Security.Cryptography.RSACryptoServiceProvider.ImportParameters(RSAParameters parameters)
at TestRSA.Form1.buttonTest_Click(Object sender, EventArgs e) in c:UsersThomasDocumentsVisual Studio 2010ProjectsModulesTestRSAForm1.cs:line 32
Used code:
RSACryptoServiceProvider rsaAlg = new RSACryptoServiceProvider();
RSAParameters key = new RSAParameters();
key.Exponent = new byte[5] { 1, 0, 0, 0, 15 };
key.Modulus = GetModulus(); // byte Array with length 256...
rsaAlg.ImportParameters(key); // <<== this call will throw the exception
Is there a limit for RSA key exponents in .NET? (With Exponent == { 1, 0, 1 } the import will succeed.
Regards
Thomas
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