private unsafe void Sign(CmsSigner signer, bool silent) { CAPI.CMSG_SIGNED_ENCODE_INFO signedEncodeInfo = new CAPI.CMSG_SIGNED_ENCODE_INFO(Marshal.SizeOf(typeof(CAPI.CMSG_SIGNED_ENCODE_INFO))); CAPI.CMSG_SIGNER_ENCODE_INFO signerEncodeInfo = PkcsUtils.CreateSignerEncodeInfo(signer, silent); byte[] encodedMessage = (byte[])null; try { SafeLocalAllocHandle localAllocHandle = CAPI.LocalAlloc(0U, new IntPtr(Marshal.SizeOf(typeof(CAPI.CMSG_SIGNER_ENCODE_INFO)))); try { Marshal.StructureToPtr((object)signerEncodeInfo, localAllocHandle.DangerousGetHandle(), false); X509Certificate2Collection bagOfCertificates = PkcsUtils.CreateBagOfCertificates(signer); SafeLocalAllocHandle encodedCertBlob = PkcsUtils.CreateEncodedCertBlob(bagOfCertificates); signedEncodeInfo.cSigners = 1U; signedEncodeInfo.rgSigners = localAllocHandle.DangerousGetHandle(); signedEncodeInfo.cCertEncoded = (uint)bagOfCertificates.Count; if (bagOfCertificates.Count > 0) { signedEncodeInfo.rgCertEncoded = encodedCertBlob.DangerousGetHandle(); } SafeCryptMsgHandle safeCryptMsgHandle = string.Compare(this.ContentInfo.ContentType.Value, "1.2.840.113549.1.7.1", StringComparison.OrdinalIgnoreCase) != 0 ? CAPI.CryptMsgOpenToEncode(65537U, this.Detached ? 4U : 0U, 2U, new IntPtr((void *)&signedEncodeInfo), this.ContentInfo.ContentType.Value, IntPtr.Zero) : CAPI.CryptMsgOpenToEncode(65537U, this.Detached ? 4U : 0U, 2U, new IntPtr((void *)&signedEncodeInfo), IntPtr.Zero, IntPtr.Zero); if (safeCryptMsgHandle == null || safeCryptMsgHandle.IsInvalid) { throw new CryptographicException(Marshal.GetLastWin32Error()); } if (this.ContentInfo.Content.Length > 0 && !CAPI.CAPISafe.CryptMsgUpdate(safeCryptMsgHandle, this.ContentInfo.pContent, (uint)this.ContentInfo.Content.Length, true)) { throw new CryptographicException(Marshal.GetLastWin32Error()); } encodedMessage = PkcsUtils.GetContent(safeCryptMsgHandle); safeCryptMsgHandle.Dispose(); encodedCertBlob.Dispose(); } finally { Marshal.DestroyStructure(localAllocHandle.DangerousGetHandle(), typeof(CAPI.CMSG_SIGNER_ENCODE_INFO)); localAllocHandle.Dispose(); } } finally { signerEncodeInfo.Dispose(); } SafeCryptMsgHandle safeCryptMsgHandle1 = SignedCms.OpenToDecode(encodedMessage, this.ContentInfo, this.Detached); if (this.m_safeCryptMsgHandle != null && !this.m_safeCryptMsgHandle.IsInvalid) { this.m_safeCryptMsgHandle.Dispose(); } this.m_safeCryptMsgHandle = safeCryptMsgHandle1; GC.KeepAlive((object)signer); }