private static unsafe CMSG_CTRL_ADD_SIGNER_UNAUTH_ATTR_PARA CreateUnsignedAddAttribute(CRYPT_ATTRIBUTE attr, HeapBlockRetainer hb)
{
var unmanagedAttr = hb.Alloc(Marshal.SizeOf(attr));
Marshal.StructureToPtr(attr, unmanagedAttr, fDeleteOld: false);
uint encodedLength = 0;
if (!NativeMethods.CryptEncodeObjectEx(
CMSG_ENCODING.Any,
lpszStructType: new IntPtr(NativeMethods.PKCS_ATTRIBUTE),
pvStructInfo: unmanagedAttr,
dwFlags: 0,
pEncodePara: IntPtr.Zero,
pvEncoded: IntPtr.Zero,
pcbEncoded: ref encodedLength))
{
var err = Marshal.GetLastWin32Error();
if (err != NativeMethods.ERROR_MORE_DATA)
{
Marshal.ThrowExceptionForHR(NativeMethods.GetHRForWin32Error(err));
}
}
var unmanagedEncoded = hb.Alloc((int)encodedLength);
if (!NativeMethods.CryptEncodeObjectEx(
CMSG_ENCODING.Any,
lpszStructType: new IntPtr(NativeMethods.PKCS_ATTRIBUTE),
pvStructInfo: unmanagedAttr,
dwFlags: 0,
pEncodePara: IntPtr.Zero,
pvEncoded: unmanagedEncoded,
pcbEncoded: ref encodedLength))
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
var addAttr = new CMSG_CTRL_ADD_SIGNER_UNAUTH_ATTR_PARA()
{
dwSignerIndex = 0,
BLOB = new CRYPT_INTEGER_BLOB()
{
cbData = encodedLength,
pbData = unmanagedEncoded
}
};
return(addAttr);
}
internal unsafe void AddTimestamp(byte[] timeStampCms)
{
using (var hb = new HeapBlockRetainer())
{
var unmanagedTimestamp = hb.Alloc(timeStampCms.Length);
Marshal.Copy(timeStampCms, 0, unmanagedTimestamp, timeStampCms.Length);
var blob = new CRYPT_INTEGER_BLOB()
{
cbData = (uint)timeStampCms.Length,
pbData = unmanagedTimestamp
};
var unmanagedBlob = hb.Alloc(Marshal.SizeOf(blob));
Marshal.StructureToPtr(blob, unmanagedBlob, fDeleteOld: false);
var attr = new CRYPT_ATTRIBUTE()
{
pszObjId = hb.AllocAsciiString(Oids.SignatureTimeStampTokenAttribute),
cValue = 1,
rgValue = unmanagedBlob
};
var unmanagedAttr = hb.Alloc(Marshal.SizeOf(attr));
Marshal.StructureToPtr(attr, unmanagedAttr, fDeleteOld: false);
uint encodedLength = 0;
if (!NativeMethods.CryptEncodeObjectEx(
dwCertEncodingType: NativeMethods.X509_ASN_ENCODING | NativeMethods.PKCS_7_ASN_ENCODING,
lpszStructType: new IntPtr(NativeMethods.PKCS_ATTRIBUTE),
pvStructInfo: unmanagedAttr,
dwFlags: 0,
pEncodePara: IntPtr.Zero,
pvEncoded: IntPtr.Zero,
pcbEncoded: ref encodedLength))
{
var err = Marshal.GetLastWin32Error();
if (err != NativeMethods.ERROR_MORE_DATA)
{
Marshal.ThrowExceptionForHR(NativeMethods.GetHRForWin32Error(err));
}
}
var unmanagedEncoded = hb.Alloc((int)encodedLength);
if (!NativeMethods.CryptEncodeObjectEx(
dwCertEncodingType: NativeMethods.X509_ASN_ENCODING | NativeMethods.PKCS_7_ASN_ENCODING,
lpszStructType: new IntPtr(NativeMethods.PKCS_ATTRIBUTE),
pvStructInfo: unmanagedAttr,
dwFlags: 0,
pEncodePara: IntPtr.Zero,
pvEncoded: unmanagedEncoded,
pcbEncoded: ref encodedLength))
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
var addAttr = new CMSG_CTRL_ADD_SIGNER_UNAUTH_ATTR_PARA()
{
dwSignerIndex = 0,
BLOB = new CRYPT_INTEGER_BLOB()
{
cbData = encodedLength,
pbData = unmanagedEncoded
}
};
addAttr.cbSize = (uint)Marshal.SizeOf(addAttr);
var unmanagedAddAttr = hb.Alloc(Marshal.SizeOf(addAttr));
Marshal.StructureToPtr(addAttr, unmanagedAddAttr, fDeleteOld: false);
if (!NativeMethods.CryptMsgControl(
_handle,
dwFlags: 0,
dwCtrlType: CMSG_CONTROL_TYPE.CMSG_CTRL_ADD_SIGNER_UNAUTH_ATTR,
pvCtrlPara: unmanagedAddAttr))
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
}
}
