public static unsafe extern bool CryptQueryObject(
CertQueryObjectType dwObjectType,
void* pvObject,
ExpectedContentTypeFlags dwExpectedContentTypeFlags,
ExpectedFormatTypeFlags dwExpectedFormatTypeFlags,
int dwFlags, // reserved - always pass 0
out CertEncodingType pdwMsgAndCertEncodingType,
out ContentType pdwContentType,
out FormatType pdwFormatType,
out SafeCertStoreHandle phCertStore,
out SafeCryptMsgHandle phMsg,
out SafeCertContextHandle ppvContext
);
private static RecipientInfoCollection CreateRecipientInfos(SafeCryptMsgHandle hCryptMsg)
{
int numRecipients;
int cbRecipientsCount = sizeof(int);
if (!Interop.Crypt32.CryptMsgGetParam(hCryptMsg, CryptMsgParamType.CMSG_CMS_RECIPIENT_COUNT_PARAM, 0, out numRecipients, ref cbRecipientsCount))
throw Marshal.GetLastWin32Error().ToCryptographicException();
List<RecipientInfo> recipientInfos = new List<RecipientInfo>(numRecipients);
for (int index = 0; index < numRecipients; index++)
{
// Do not dispose this safehandle. The RecipientInfoPal objects we create hold on to these and they get freed through garbage collection.
SafeHandle pCmsgCmsRecipientInfoMemory = hCryptMsg.GetMsgParamAsMemory(CryptMsgParamType.CMSG_CMS_RECIPIENT_INFO_PARAM, index);
IEnumerable<RecipientInfo> recipientInfosForThisIndex = ToRecipientInfosForThisIndex(pCmsgCmsRecipientInfoMemory, index);
recipientInfos.AddRange(recipientInfosForThisIndex);
}
return new RecipientInfoCollection(recipientInfos);
}
internal static extern bool CryptMsgGetParam(SafeCryptMsgHandle hCryptMsg, CryptMsgParamType dwParamType, int dwIndex, IntPtr pvData, [In, Out] ref int pcbData);
private DecryptorPalWindows(SafeCryptMsgHandle hCryptMsg, RecipientInfoCollection recipientInfos)
: base(recipientInfos)
{
_hCryptMsg = hCryptMsg;
}
public static extern bool CryptMsgGetParam(SafeCryptMsgHandle hCryptMsg, CryptMessageParameterType dwParamType, int dwIndex, out int pvData, [In, Out] ref int pcbData);
internal static extern bool CryptMsgUpdate(SafeCryptMsgHandle hCryptMsg, IntPtr pbData, int cbData, bool fFinal);
internal static extern bool CryptMsgUpdate(SafeCryptMsgHandle hCryptMsg, [In] byte[] pbData, int cbData, bool fFinal);
private static SafeCertContextHandle GetSignerInPKCS7Store(SafeCertStoreHandle hCertStore, SafeCryptMsgHandle hCryptMsg)
{
// make sure that there is at least one signer of the certificate store
int dwSigners;
int cbSigners = sizeof(int);
if (!Interop.crypt32.CryptMsgGetParam(hCryptMsg, CryptMessageParameterType.CMSG_SIGNER_COUNT_PARAM, 0, out dwSigners, ref cbSigners))
throw Marshal.GetHRForLastWin32Error().ToCryptographicException();;
if (dwSigners == 0)
throw ErrorCode.CRYPT_E_SIGNER_NOT_FOUND.ToCryptographicException();
// get the first signer from the store, and use that as the loaded certificate
int cbData = 0;
if (!Interop.crypt32.CryptMsgGetParam(hCryptMsg, CryptMessageParameterType.CMSG_SIGNER_INFO_PARAM, 0, null, ref cbData))
throw Marshal.GetHRForLastWin32Error().ToCryptographicException();;
byte[] cmsgSignerBytes = new byte[cbData];
if (!Interop.crypt32.CryptMsgGetParam(hCryptMsg, CryptMessageParameterType.CMSG_SIGNER_INFO_PARAM, 0, cmsgSignerBytes, ref cbData))
throw Marshal.GetHRForLastWin32Error().ToCryptographicException();;
CERT_INFO certInfo = default(CERT_INFO);
unsafe
{
fixed (byte* pCmsgSignerBytes = cmsgSignerBytes)
{
CMSG_SIGNER_INFO_Partial* pCmsgSignerInfo = (CMSG_SIGNER_INFO_Partial*)pCmsgSignerBytes;
certInfo.Issuer.cbData = pCmsgSignerInfo->Issuer.cbData;
certInfo.Issuer.pbData = pCmsgSignerInfo->Issuer.pbData;
certInfo.SerialNumber.cbData = pCmsgSignerInfo->SerialNumber.cbData;
certInfo.SerialNumber.pbData = pCmsgSignerInfo->SerialNumber.pbData;
}
SafeCertContextHandle pCertContext = null;
if (!Interop.crypt32.CertFindCertificateInStore(hCertStore, CertFindType.CERT_FIND_SUBJECT_CERT, &certInfo, ref pCertContext))
throw Marshal.GetHRForLastWin32Error().ToCryptographicException();;
return pCertContext;
}
}
internal static extern bool CryptMsgControl(SafeCryptMsgHandle hCryptMsg, int dwFlags, MsgControlType dwCtrlType, [In] ref CMSG_CTRL_KEY_AGREE_DECRYPT_PARA pvCtrlPara);
