/// <summary>
/// Generate a key pair blob
/// </summary>
/// <exception cref="ArgumentOutOfRangeException">
/// If <paramref name="keySize"/> is not positive
/// </exception>
/// <exception cref="InvalidOperationException">
/// If the key could not be generated
/// </exception>
/// <param name="keySize">size, in bits, of the key to generate</param>
/// <returns>generated key pair blob</returns>
public static byte[] GenerateKeyPair(int keySize)
{
if (keySize <= 0)
{
throw new ArgumentOutOfRangeException("keySize");
}
// variables that hold the unmanaged key
IntPtr keyBlob = IntPtr.Zero;
long generatedSize = 0;
try
{
// create the key
if (!StrongNameNative.StrongNameKeyGenEx(
null, StrongNameKeyGenFlags.None, (int)keySize,
out keyBlob, out generatedSize))
{
Marshal.ThrowExceptionForHR(StrongNameNative.StrongNameErrorInfo());
}
// make sure the key size makes sense
if (generatedSize <= 0 || generatedSize > int.MaxValue)
{
throw new InvalidOperationException();
}
// get the key into managed memory
byte[] key = new byte[generatedSize];
Marshal.Copy(keyBlob, key, 0, (int)generatedSize);
return(key);
}
finally
{
// release the unmanaged memory the key resides in
if (keyBlob != IntPtr.Zero)
{
StrongNameNative.StrongNameFreeBuffer(keyBlob);
}
}
}
