private Exception TryExecuteDecryptAgree(ref CMSG_CTRL_KEY_AGREE_DECRYPT_PARA decryptPara) { if (!Interop.Crypt32.CryptMsgControl(_hCryptMsg, 0, MsgControlType.CMSG_CTRL_KEY_AGREE_DECRYPT, ref decryptPara)) { ErrorCode errorCode = (ErrorCode)(Marshal.GetHRForLastWin32Error()); return(errorCode.ToCryptographicException()); } return(null); }
private Exception TryDecryptAgree(KeyAgreeRecipientInfo keyAgreeRecipientInfo, SafeProvOrNCryptKeyHandle hKey, CryptKeySpec keySpec, X509Certificate2Collection originatorCerts, X509Certificate2Collection extraStore) { unsafe { KeyAgreeRecipientInfoPalWindows pal = (KeyAgreeRecipientInfoPalWindows)(keyAgreeRecipientInfo.Pal); return(pal.WithCmsgCmsRecipientInfo <Exception>( delegate(CMSG_KEY_AGREE_RECIPIENT_INFO * pKeyAgreeRecipientInfo) { CMSG_CTRL_KEY_AGREE_DECRYPT_PARA decryptPara = default(CMSG_CTRL_KEY_AGREE_DECRYPT_PARA); decryptPara.cbSize = Marshal.SizeOf <CMSG_CTRL_KEY_AGREE_DECRYPT_PARA>(); decryptPara.hProv = hKey; decryptPara.dwKeySpec = keySpec; decryptPara.pKeyAgree = pKeyAgreeRecipientInfo; decryptPara.dwRecipientIndex = pal.Index; decryptPara.dwRecipientEncryptedKeyIndex = pal.SubIndex; CMsgKeyAgreeOriginatorChoice originatorChoice = pKeyAgreeRecipientInfo->dwOriginatorChoice; switch (originatorChoice) { case CMsgKeyAgreeOriginatorChoice.CMSG_KEY_AGREE_ORIGINATOR_CERT: { X509Certificate2Collection candidateCerts = new X509Certificate2Collection(); candidateCerts.AddRange(Helpers.GetStoreCertificates(StoreName.AddressBook, StoreLocation.CurrentUser, openExistingOnly: true)); candidateCerts.AddRange(Helpers.GetStoreCertificates(StoreName.AddressBook, StoreLocation.LocalMachine, openExistingOnly: true)); candidateCerts.AddRange(originatorCerts); candidateCerts.AddRange(extraStore); SubjectIdentifier originatorId = pKeyAgreeRecipientInfo->OriginatorCertId.ToSubjectIdentifier(); using (X509Certificate2 originatorCert = candidateCerts.TryFindMatchingCertificate(originatorId)) { if (originatorCert == null) { return ErrorCode.CRYPT_E_NOT_FOUND.ToCryptographicException(); } using (SafeCertContextHandle hCertContext = originatorCert.CreateCertContextHandle()) { CERT_CONTEXT *pOriginatorCertContext = hCertContext.DangerousGetCertContext(); decryptPara.OriginatorPublicKey = pOriginatorCertContext->pCertInfo->SubjectPublicKeyInfo.PublicKey; // Do not factor this call out of the switch statement as leaving this "using" block will free up // native memory that decryptPara points to. return TryExecuteDecryptAgree(ref decryptPara); } } } case CMsgKeyAgreeOriginatorChoice.CMSG_KEY_AGREE_ORIGINATOR_PUBLIC_KEY: { decryptPara.OriginatorPublicKey = pKeyAgreeRecipientInfo->OriginatorPublicKeyInfo.PublicKey; return TryExecuteDecryptAgree(ref decryptPara); } default: return new CryptographicException(SR.Format(SR.Cryptography_Cms_Invalid_Originator_Identifier_Choice, originatorChoice)); } })); } }
internal static partial bool CryptMsgControl( SafeCryptMsgHandle hCryptMsg, int dwFlags, MsgControlType dwCtrlType, ref CMSG_CTRL_KEY_AGREE_DECRYPT_PARA pvCtrlPara);
private Exception TryExecuteDecryptAgree(ref CMSG_CTRL_KEY_AGREE_DECRYPT_PARA decryptPara) { if (!Interop.Crypt32.CryptMsgControl(_hCryptMsg, 0, MsgControlType.CMSG_CTRL_KEY_AGREE_DECRYPT, ref decryptPara)) { ErrorCode errorCode = (ErrorCode)(Marshal.GetHRForLastWin32Error()); return errorCode.ToCryptographicException(); } return null; }