// Provides access to the native CMSG_KEY_TRANS_RECIPIENT_INFO* structure. This helper is structured as taking a delegate to
// help avoid the easy trap of forgetting to prevent the underlying memory block from being GC'd early.
private T WithCmsgCmsRecipientInfo <T>(KeyTransReceiver <T> receiver)
{
unsafe
{
CMSG_CMS_RECIPIENT_INFO * pRecipientInfo = (CMSG_CMS_RECIPIENT_INFO *)(_pCmsgCmsRecipientInfoMemory.DangerousGetHandle());
CMSG_KEY_TRANS_RECIPIENT_INFO *pKeyTrans = pRecipientInfo->KeyTrans;
T value = receiver(pKeyTrans);
GC.KeepAlive(_pCmsgCmsRecipientInfoMemory);
return(value);
}
}
// Provides access to the native CMSG_KEY_TRANS_RECIPIENT_INFO* structure. This helper is structured as taking a delegate to
// help avoid the easy trap of forgetting to prevent the underlying memory block from being GC'd early.
internal T WithCmsgCmsRecipientInfo <T>(KeyAgreeReceiver <T> receiver)
{
unsafe
{
CMSG_CMS_RECIPIENT_INFO * pRecipientInfo = (CMSG_CMS_RECIPIENT_INFO *)(_pCmsgCmsRecipientInfoMemory.DangerousGetHandle());
CMSG_KEY_AGREE_RECIPIENT_INFO *pKeyAgree = pRecipientInfo->KeyAgree;
T value = receiver(pKeyAgree);
GC.KeepAlive(_pCmsgCmsRecipientInfoMemory);
return(value);
}
}
private static IEnumerable <RecipientInfo> ToRecipientInfosForThisIndex(SafeHandle pCmsgCmsRecipientInfoMemory, int index)
{
bool mustRelease = false;
pCmsgCmsRecipientInfoMemory.DangerousAddRef(ref mustRelease);
try
{
unsafe
{
CMSG_CMS_RECIPIENT_INFO *pCMsgCmsRecipientInfo = (CMSG_CMS_RECIPIENT_INFO *)(pCmsgCmsRecipientInfoMemory.DangerousGetHandle());
switch (pCMsgCmsRecipientInfo->dwRecipientChoice)
{
case CMsgCmsRecipientChoice.CMSG_KEY_TRANS_RECIPIENT:
return(new KeyTransRecipientInfo[] { new KeyTransRecipientInfo(new KeyTransRecipientInfoPalWindows(pCmsgCmsRecipientInfoMemory, index)) });
case CMsgCmsRecipientChoice.CMSG_KEY_AGREE_RECIPIENT:
{
CMSG_KEY_AGREE_RECIPIENT_INFO *pCmsKeyAgreeRecipientInfo = pCMsgCmsRecipientInfo->KeyAgree;
int numKeys = pCmsKeyAgreeRecipientInfo->cRecipientEncryptedKeys;
KeyAgreeRecipientInfo[] recipients = new KeyAgreeRecipientInfo[numKeys];
for (int subIndex = 0; subIndex < numKeys; subIndex++)
{
recipients[subIndex] = new KeyAgreeRecipientInfo(new KeyAgreeRecipientInfoPalWindows(pCmsgCmsRecipientInfoMemory, index, subIndex));
}
return(recipients);
}
default:
throw ErrorCode.E_NOTIMPL.ToCryptographicException();
}
}
}
finally
{
if (mustRelease)
{
pCmsgCmsRecipientInfoMemory.DangerousRelease();
}
}
}
