private static byte[] EncodeData(byte[] publicKey, byte[] serialNumber)
{
IntPtr publicKeyPtr = IntPtr.Zero, serialNumberPtr = IntPtr.Zero;
try
{
var identifier = new CERT_AUTHORITY_KEY_ID2_INFO();
identifier.AuthorityCertIssuer = new CERT_ALT_NAME_INFO { cAltEntry = 0 };
if (serialNumber != null)
{
serialNumberPtr = Marshal.AllocHGlobal(serialNumber.Length);
Marshal.Copy(serialNumber, 0, serialNumberPtr, serialNumber.Length);
identifier.AuthorityCertSerialNumber = new CRYPTOAPI_BLOB { cbData = (uint)serialNumber.Length, pbData = serialNumberPtr };
}
if (publicKey != null)
{
publicKeyPtr = Marshal.AllocHGlobal(publicKey.Length);
Marshal.Copy(publicKey, 0, publicKeyPtr, publicKey.Length);
identifier.KeyId = new CRYPTOAPI_BLOB { cbData = (uint)publicKey.Length, pbData = publicKeyPtr };
}
uint dataSize = 0;
byte[] data;
if (Crypt32.CryptEncodeObjectEx(EncodingType.X509_ASN_ENCODING, OIDs.szOID_AUTHORITY_KEY_IDENTIFIER2, ref identifier, 0x8000, IntPtr.Zero, out data, ref dataSize))
{
return data;
}
throw new Win32Exception(Marshal.GetLastWin32Error());
}
finally
{
Marshal.FreeHGlobal(publicKeyPtr);
Marshal.FreeHGlobal(serialNumberPtr);
}
}
public static extern bool CryptEncodeObjectEx
(
[param: In, MarshalAs(UnmanagedType.U4)] EncodingType dwCertEncodingType,
[param: In, MarshalAs(UnmanagedType.LPStr)] string lpszStructType,
[param: In, MarshalAs(UnmanagedType.Struct)] ref CERT_AUTHORITY_KEY_ID2_INFO pvStructInfo,
[param: In, MarshalAs(UnmanagedType.U4)] uint dwFlags,
[param: In, MarshalAs(UnmanagedType.SysInt)] IntPtr pEncodePara,
[param: Out] out LocalBufferSafeHandle pvEncoded,
[param: In, Out, MarshalAs(UnmanagedType.U4)] ref uint pcbEncoded
);
