コード例 #1
0
        static void Main(string[] args)
        {
            string InFileName = "C:\\temp\\tag-sample.pdf";
            string OutFileName = "C:\\temp\\tag-sample-signed.pdf";
            string startDelim = "<<";
            string endDelim = ">>";
            int rc;
            SESHandle SesHandle;
            SigFieldSettingsClass SFS = new SigFieldSettingsClass();
            TimeFormatClass TF = new TimeFormatClass();
            int Flags = AR_PDF_FLAG_FIELD_NAME_SET;
            int LocNumber;

            SAPICrypt SAPI = new SAPICryptClass();

            // SAPIInit() should be called once per process
            if ((rc = SAPI.Init()) != 0) throw new Exception("Failed to initialize SAPI! (" + rc.ToString("X") + ")");

            // Open a new SAPI context
            if ((rc = SAPI.HandleAcquire(out SesHandle)) != 0) throw new Exception("Failed in SAPIHandleAcquire() with rc = " + rc.ToString("X"));

            if ((rc = SAPI.Logon(SesHandle, "testuser", null, "12345678")) != 0)
            {
                SAPI.HandleRelease(SesHandle);
                throw new Exception("Failed in SAPILogon() with rc = " + rc.ToString("X"));
            }

            //
            // Locate all field tags in the PDF
            // The PDF filename to be used is defined above.
            // The format of each field locator in the PDF should be:
            //   << w={width}; h={height}; n={field name}; a={appearance mask} >>
            //
            // For example:
            //  << w=120; h=80; n=Signer1; a=15; >>
            //
            SAPIContext SigLocatorCtx = new SAPIContext();

            Array fileBytes = File.ReadAllBytes(InFileName);
            SAPIByteArray doc = new SAPIByteArrayClass();
            doc.FromArray(ref fileBytes);
            FileHandle fh;
            if ((rc = SAPI.CreateFileHandleByMem(out fh, SAPI_ENUM_FILE_TYPE.SAPI_ENUM_FILE_ADOBE, 0, doc)) != 0)
            {
                SAPI.HandleRelease(SesHandle);
                throw new Exception("Failed to create file handle with rc = " + rc.ToString("X"));
            }

            //  Initiate a new Field Locator enumerator.
            //  The argument LocNumber will contain the number of signature tags found in the PDF document.
            //
            if ((rc = SAPI.SignatureFieldLocatorEnumInit(SesHandle, SigLocatorCtx, fh, startDelim, endDelim, 0, out LocNumber)) != 0)
            {
                SAPI.HandleRelease(fh);
                SAPI.HandleRelease(SesHandle);
                throw new Exception("LocatorEnumInit failed with rc = " + rc.ToString("X"));
            }

            // Do for all tags in the document
            string strEncMsg;
            for (int i = 0; i < LocNumber; i++)
            {
                // Get settings for the next field locator.
                // (Use strEncMsg string to parse the field locator content if a custom string format has been used)
                if ((rc = SAPI.SignatureFieldLocatorEnumCont(SesHandle, SigLocatorCtx, SFS, out strEncMsg)) != 0)
                {
                    SAPI.ContextRelease(SigLocatorCtx);
                    SAPI.HandleRelease(fh);
                    SAPI.HandleRelease(SesHandle);
                    throw new Exception("LocatorEnumCont failed with rc = " + rc.ToString("X"));
                }

                // The following values of the SignatureFieldSettings will be automatically set by SAPI:
                //   X/Y Location (including page number)
                //   Width
                //   Height
                //   Field Name
                //   Appearance Mask
                //
                SFS.LabelsMask = 0;
                SFS.DependencyMode = SAPI_ENUM_DEPENDENCY_MODE.SAPI_ENUM_DEPENDENCY_MODE_INDEPENDENT;
                SFS.SignatureType = SAPI_ENUM_SIGNATURE_TYPE.SAPI_ENUM_SIGNATURE_DIGITAL;
                SFS.Flags = 0;

                // time:
                TF.DateFormat = "dd MMM yyyy";
                TF.TimeFormat = "hh:mm:ss";
                TF.ExtTimeFormat = SAPI_ENUM_EXTENDED_TIME_FORMAT.SAPI_ENUM_EXTENDED_TIME_FORMAT_NONE;
                SFS.TimeFormat = TF;

                //  Now create the signature field on the PDF
                //  We make use of SignatureFieldCreateEx function in order to pass the FileHandle for the in-memory
                //  file rather than a UNC file path.
                if ((rc = SAPI.SignatureFieldCreateSignEx2(SesHandle, SAPI_ENUM_FILE_TYPE.SAPI_ENUM_FILE_ADOBE,
                    "", fh, SFS, Flags, null)) != 0)
                {
                    SAPI.ContextRelease(SigLocatorCtx);
                    SAPI.HandleRelease(fh);
                    SAPI.HandleRelease(SesHandle);
                    throw new Exception("Failed to create new signature field with rc = " + rc.ToString("X"));
                }
            }

            //  Write the PDF to an output file
            if ((rc = SAPI.GetFileMemData(fh, 0, doc)) != 0)
            {
                SAPI.ContextRelease(SigLocatorCtx);
                SAPI.HandleRelease(fh);
                SAPI.HandleRelease(SesHandle);
                throw new Exception("Failed to GetFileMem with rc = " + rc.ToString("X"));
            }

            File.WriteAllBytes(OutFileName, (byte[])doc.ToArray());

            //  Finalize work with SAPI
            SAPI.ContextRelease(SigLocatorCtx);
            SAPI.HandleRelease(fh);
            SAPI.HandleRelease(SesHandle);
        }
コード例 #2
0
        static void Main(string[] args)
        {
            string                InFileName  = "C:\\temp\\tag-sample.pdf";
            string                OutFileName = "C:\\temp\\tag-sample-signed.pdf";
            string                startDelim  = "<<";
            string                endDelim    = ">>";
            int                   rc;
            SESHandle             SesHandle;
            SigFieldSettingsClass SFS   = new SigFieldSettingsClass();
            TimeFormatClass       TF    = new TimeFormatClass();
            int                   Flags = AR_PDF_FLAG_FIELD_NAME_SET;
            int                   LocNumber;

            SAPICrypt SAPI = new SAPICryptClass();

            // SAPIInit() should be called once per process
            if ((rc = SAPI.Init()) != 0)
            {
                throw new Exception("Failed to initialize SAPI! (" + rc.ToString("X") + ")");
            }

            // Open a new SAPI context
            if ((rc = SAPI.HandleAcquire(out SesHandle)) != 0)
            {
                throw new Exception("Failed in SAPIHandleAcquire() with rc = " + rc.ToString("X"));
            }

            if ((rc = SAPI.Logon(SesHandle, "testuser", null, "12345678")) != 0)
            {
                SAPI.HandleRelease(SesHandle);
                throw new Exception("Failed in SAPILogon() with rc = " + rc.ToString("X"));
            }

            //
            // Locate all field tags in the PDF
            // The PDF filename to be used is defined above.
            // The format of each field locator in the PDF should be:
            //   << w={width}; h={height}; n={field name}; a={appearance mask} >>
            //
            // For example:
            //  << w=120; h=80; n=Signer1; a=15; >>
            //
            SAPIContext SigLocatorCtx = new SAPIContext();

            Array         fileBytes = File.ReadAllBytes(InFileName);
            SAPIByteArray doc       = new SAPIByteArrayClass();

            doc.FromArray(ref fileBytes);
            FileHandle fh;

            if ((rc = SAPI.CreateFileHandleByMem(out fh, SAPI_ENUM_FILE_TYPE.SAPI_ENUM_FILE_ADOBE, 0, doc)) != 0)
            {
                SAPI.HandleRelease(SesHandle);
                throw new Exception("Failed to create file handle with rc = " + rc.ToString("X"));
            }

            //  Initiate a new Field Locator enumerator.
            //  The argument LocNumber will contain the number of signature tags found in the PDF document.
            //
            if ((rc = SAPI.SignatureFieldLocatorEnumInit(SesHandle, SigLocatorCtx, fh, startDelim, endDelim, 0, out LocNumber)) != 0)
            {
                SAPI.HandleRelease(fh);
                SAPI.HandleRelease(SesHandle);
                throw new Exception("LocatorEnumInit failed with rc = " + rc.ToString("X"));
            }

            // Do for all tags in the document
            string strEncMsg;

            for (int i = 0; i < LocNumber; i++)
            {
                // Get settings for the next field locator.
                // (Use strEncMsg string to parse the field locator content if a custom string format has been used)
                if ((rc = SAPI.SignatureFieldLocatorEnumCont(SesHandle, SigLocatorCtx, SFS, out strEncMsg)) != 0)
                {
                    SAPI.ContextRelease(SigLocatorCtx);
                    SAPI.HandleRelease(fh);
                    SAPI.HandleRelease(SesHandle);
                    throw new Exception("LocatorEnumCont failed with rc = " + rc.ToString("X"));
                }

                // The following values of the SignatureFieldSettings will be automatically set by SAPI:
                //   X/Y Location (including page number)
                //   Width
                //   Height
                //   Field Name
                //   Appearance Mask
                //
                SFS.LabelsMask     = 0;
                SFS.DependencyMode = SAPI_ENUM_DEPENDENCY_MODE.SAPI_ENUM_DEPENDENCY_MODE_INDEPENDENT;
                SFS.SignatureType  = SAPI_ENUM_SIGNATURE_TYPE.SAPI_ENUM_SIGNATURE_DIGITAL;
                SFS.Flags          = 0;

                // time:
                TF.DateFormat    = "dd MMM yyyy";
                TF.TimeFormat    = "hh:mm:ss";
                TF.ExtTimeFormat = SAPI_ENUM_EXTENDED_TIME_FORMAT.SAPI_ENUM_EXTENDED_TIME_FORMAT_NONE;
                SFS.TimeFormat   = TF;

                //  Now create the signature field on the PDF
                //  We make use of SignatureFieldCreateEx function in order to pass the FileHandle for the in-memory
                //  file rather than a UNC file path.
                if ((rc = SAPI.SignatureFieldCreateSignEx2(SesHandle, SAPI_ENUM_FILE_TYPE.SAPI_ENUM_FILE_ADOBE,
                                                           "", fh, SFS, Flags, null)) != 0)
                {
                    SAPI.ContextRelease(SigLocatorCtx);
                    SAPI.HandleRelease(fh);
                    SAPI.HandleRelease(SesHandle);
                    throw new Exception("Failed to create new signature field with rc = " + rc.ToString("X"));
                }
            }

            //  Write the PDF to an output file
            if ((rc = SAPI.GetFileMemData(fh, 0, doc)) != 0)
            {
                SAPI.ContextRelease(SigLocatorCtx);
                SAPI.HandleRelease(fh);
                SAPI.HandleRelease(SesHandle);
                throw new Exception("Failed to GetFileMem with rc = " + rc.ToString("X"));
            }

            File.WriteAllBytes(OutFileName, (byte[])doc.ToArray());

            //  Finalize work with SAPI
            SAPI.ContextRelease(SigLocatorCtx);
            SAPI.HandleRelease(fh);
            SAPI.HandleRelease(SesHandle);
        }
コード例 #3
0
        public static void SignStream(
            string Username,
            string Domain,
            string Password,
            Stream DataToSign,     //The stream to read the data to be signed from
            Stream SignatureData   //The stream to write the signature data to
            )
        {
            if (string.IsNullOrEmpty(Username))
            {
                throw new ArgumentNullException("Username");
            }
            if (string.IsNullOrEmpty(Password))
            {
                throw new ArgumentNullException("Password");
            }
            if (DataToSign == null)
            {
                throw new ArgumentNullException("DataToSign");
            }
            if (SignatureData == null)
            {
                throw new ArgumentNullException("SignatureData");
            }

            //Make sure the SAPI library is loaded into the current process
            SAPIInit();

            //Instantiate SAPI object
            SAPICrypt SAPI = new SAPICryptClass();

            SESHandle hSes = null;
            int       rc   = 0;

            if ((rc = SAPI.HandleAcquire(out hSes)) != 0)
            {
                throw new Exception(string.Format(
                                        "Memory allocation error (#{0})", rc.ToString("X")));
            }


            if ((rc = SAPI.Logon(hSes, Username, Domain, Password)) != 0)
            {
                SAPI.HandleRelease(hSes);
                throw new Exception(string.Format(
                                        "Failed to authenticate the user(#{0})", rc.ToString("X")));
            }

            //Allocate new signing context
            SAPIContext ctxBuffSign = new SAPIContextClass();

            if ((rc = SAPI.BufferSignInit(hSes, ctxBuffSign, 0)) != 0)
            {
                SAPI.Logoff(hSes);
                SAPI.HandleRelease(hSes);
                throw new Exception(string.Format(
                                        "Failed to initialize buffer signing process(#{0})", rc.ToString("X")));
            }


            int remaining = (int)DataToSign.Length;

            //Check that the stream is not empty
            if ((int)DataToSign.Length < 1)
            {
                SAPI.Logoff(hSes);
                SAPI.HandleRelease(hSes);
                throw new Exception("Cannot sign empty stream!");
            }

            int chunkMaxSize = 1 << 20; //1MB

            //Calculate first chunk size
            int chunkSize = remaining < chunkMaxSize ?
                            remaining : chunkMaxSize;

            while (remaining > 0)
            {
                Array chunk = new byte[chunkSize]; //Read in chunks of 1MB
                int   read  = DataToSign.Read((byte[])chunk, 0, chunkSize);
                if (read <= 0)
                {
                    throw new EndOfStreamException(String.Format("End of stream reached with {0} bytes left to read", remaining));
                }

                //Build SAPI-Compatible bytes array
                SAPIByteArray tmpBuff = new SAPIByteArrayClass();
                tmpBuff.FromArray(ref chunk);

                //Add read buffer to the signature calculation
                if ((rc = SAPI.BufferSignCont(hSes, ctxBuffSign, tmpBuff)) != 0)
                {
                    SAPI.ContextRelease(ctxBuffSign);
                    SAPI.Logoff(hSes);
                    SAPI.HandleRelease(hSes);

                    throw new Exception(string.Format(
                                            "An error occured while calculating the digital signature (#{0})", rc.ToString("X")));
                }

                remaining -= read;
                chunkSize  = Math.Min(remaining, chunkSize);
            }


            SAPIByteArray signature = new SAPIByteArrayClass();

            //Get the final signature
            if ((rc = SAPI.BufferSignEnd(hSes, ctxBuffSign, signature)) != 0)
            {
                SAPI.ContextRelease(ctxBuffSign);
                SAPI.Logoff(hSes);
                SAPI.HandleRelease(hSes);

                throw new Exception(string.Format(
                                        "Failed to sign the data (#{0})", rc.ToString("X")));
            }

            //Write signature data to the stream
            byte[] tmpSig = (byte[])signature.ToArray();
            SignatureData.Write(tmpSig, 0, tmpSig.Length);

            //Cleanup memory
            SAPI.ContextRelease(ctxBuffSign);
            SAPI.Logoff(hSes);
            SAPI.HandleRelease(hSes);
        }
コード例 #4
0
        public static SignatureDetails ValidateSignature(Stream SignedData, Stream Signature)
        {
            if (SignedData == null)
            {
                throw new ArgumentNullException("SignedData");
            }
            if (Signature == null)
            {
                throw new ArgumentNullException("Signature");
            }

            //Make sure the SAPI Library is loaded
            SAPIInit();

            SignatureDetails SigDetails = new SignatureDetails();
            int rc;

            SAPICrypt SAPI = new SAPICryptClass();

            SESHandle hSession = new SESHandleClass();

            if ((rc = SAPI.HandleAcquire(out hSession)) != 0)
            {
                throw new Exception(string.Format(
                                        "Memory allocation error (#{0})", rc.ToString("X")));
            }



            //Extract Signer Data from the Signature stream



            //Read Signature content from stream to the SAPI bytes array
            Array baSignature = new byte[(int)Signature.Length];

            Signature.Read((byte[])baSignature, 0, (int)Signature.Length);
            SAPIByteArray sSignature = new SAPIByteArrayClass();

            sSignature.FromArray(ref baSignature);

            //SAPIByteArray sSignedData = new SAPIByteArrayClass();
            //Array t1 = (Array)SignedData; sSignedData.FromArray(ref t1);


            object Certificate;
            // Extract the signer's certificate from signature
            SAPI_ENUM_DATA_TYPE SAPIType = SAPI_ENUM_DATA_TYPE.SAPI_ENUM_DATA_TYPE_NONE;

            if ((rc = SAPI.PKCS7BlobGetValue(hSession, sSignature, SAPI_ENUM_PKCS7_FIELD.SAPI_ENUM_PKCS7_FIELD_CERT, out Certificate, ref SAPIType)) != 0)
            {
                SAPI.HandleRelease(hSession);
                throw new Exception(string.Format(
                                        "An error occured while extracting the signer's certificate from the signature stream (#{0})", rc.ToString("X")));
            }

            SigDetails.SignerCertificate = new X509Certificate2((byte[])(((SAPIByteArray)Certificate).ToArray()));
            SigDetails.SignerName        = SigDetails.SignerCertificate.GetNameInfo(X509NameType.SimpleName, false);
            SigDetails.SignerEmail       = SigDetails.SignerCertificate.GetNameInfo(X509NameType.EmailName, false);


            //Run the signature validation process
            SAPIContext ctxValidateSignature = new SAPIContextClass();

            if ((rc = SAPI.BufferVerifySignatureInit(hSession,
                                                     ctxValidateSignature, sSignature, 0)) != 0)
            {
                SAPI.HandleRelease(hSession);
                throw new Exception(string.Format(
                                        "An error occured while initializing the signature validation process (#{0})", rc.ToString("X")));
            }


            int remaining    = (int)SignedData.Length;
            int chunkMaxSize = 1 << 20; //1MB

            //Calculate first chunk size
            int chunkSize = remaining < chunkMaxSize ?
                            remaining : chunkMaxSize;

            while (remaining > 0)
            {
                Array chunk = new byte[chunkSize]; //Read in chunks of 1MB
                int   read  = SignedData.Read((byte[])chunk, 0, chunkSize);
                if (read <= 0)
                {
                    throw new EndOfStreamException(String.Format("End of stream reached with {0} bytes left to read", remaining));
                }

                //Build SAPI-Compatible byte array
                SAPIByteArray tmpBuff = new SAPIByteArrayClass();
                tmpBuff.FromArray(ref chunk);

                //Add read buffer to the validation calculation
                if ((rc = SAPI.BufferVerifySignatureCont(hSession, ctxValidateSignature, tmpBuff)) != 0)
                {
                    SAPI.ContextRelease(ctxValidateSignature);
                    SAPI.HandleRelease(hSession);

                    throw new Exception(string.Format(
                                            "An error occured while validating the digital signature (#{0})", rc.ToString("X")));
                }

                remaining -= read;
                chunkSize  = Math.Min(remaining, chunkSize);
            }


            //Get the final validation result
            SAPIFileTime signingTime = new SAPIFileTimeClass();

            rc = SAPI.BufferVerifySignatureEnd(hSession, ctxValidateSignature, signingTime, new CertStatusClass());
            if ((uint)rc == 0x90030360)  //SAPI_SIGNATURE_NOT_VALID
            {
                SigDetails.isValid            = false;
                SigDetails.SignatureTimeTicks = 0;
            }
            else if (rc == 0)
            {
                SigDetails.isValid = true;

                //Convert FILE_TIME to ticks
                ulong filetime = signingTime.HighDateTime;
                filetime <<= 32;
                filetime  += signingTime.LowDateTime;
                SigDetails.SignatureTimeTicks = DateTime.FromFileTimeUtc((long)filetime).Ticks;
            }
            else
            {
                SAPI.ContextRelease(ctxValidateSignature);
                SAPI.HandleRelease(hSession);

                throw new Exception(string.Format(
                                        "Failed to validate Digital Signature (#{0})", rc.ToString("X")));
            }


            //Cleanup memory
            SAPI.ContextRelease(ctxValidateSignature);
            SAPI.HandleRelease(hSession);

            return(SigDetails);
        }
コード例 #5
0
        public static void SignStream(
            string Username,   
            string Domain,     
            string Password,
            Stream DataToSign,     //The stream to read the data to be signed from
            Stream SignatureData   //The stream to write the signature data to
            )
        {
            if (string.IsNullOrEmpty(Username)) throw new ArgumentNullException("Username");
            if (string.IsNullOrEmpty(Password)) throw new ArgumentNullException("Password");
            if (DataToSign == null) throw new ArgumentNullException("DataToSign");
            if (SignatureData == null) throw new ArgumentNullException("SignatureData");

            //Make sure the SAPI library is loaded into the current process
            SAPIInit();

            //Instantiate SAPI object
            SAPICrypt SAPI = new SAPICryptClass();

            SESHandle hSes = null;
            int rc = 0;

            if ((rc = SAPI.HandleAcquire (out hSes)) != 0)
            {
                throw new Exception(string.Format(
                    "Memory allocation error (#{0})", rc.ToString("X")));
            }

            if ((rc = SAPI.Logon(hSes, Username, Domain, Password)) != 0)
            {
                SAPI.HandleRelease(hSes);
                throw new Exception(string.Format(
                    "Failed to authenticate the user(#{0})", rc.ToString("X")));
            }

            //Allocate new signing context
            SAPIContext ctxBuffSign = new SAPIContextClass();

            if ((rc = SAPI.BufferSignInit (hSes, ctxBuffSign, 0)) != 0)
            {
                SAPI.Logoff(hSes);
                SAPI.HandleRelease(hSes);
                throw new Exception(string.Format(
                    "Failed to initialize buffer signing process(#{0})", rc.ToString("X")));
            }

            int remaining = (int)DataToSign.Length;

            //Check that the stream is not empty
            if ((int)DataToSign.Length < 1)
            {
                SAPI.Logoff(hSes);
                SAPI.HandleRelease(hSes);
                throw new Exception("Cannot sign empty stream!");
            }

            int chunkMaxSize = 1 << 20; //1MB

            //Calculate first chunk size
            int chunkSize = remaining < chunkMaxSize ?
                remaining : chunkMaxSize;

            while (remaining > 0)
            {
                Array chunk = new byte[chunkSize]; //Read in chunks of 1MB
                int read = DataToSign.Read((byte[])chunk, 0, chunkSize);
                if (read <= 0) throw new EndOfStreamException (String.Format("End of stream reached with {0} bytes left to read", remaining));

                //Build SAPI-Compatible bytes array
                SAPIByteArray tmpBuff = new SAPIByteArrayClass();
                tmpBuff.FromArray(ref chunk);

                //Add read buffer to the signature calculation
                if ((rc = SAPI.BufferSignCont(hSes, ctxBuffSign, tmpBuff))!= 0)
                {
                    SAPI.ContextRelease (ctxBuffSign);
                    SAPI.Logoff (hSes);
                    SAPI.HandleRelease (hSes);

                    throw new Exception(string.Format(
                        "An error occured while calculating the digital signature (#{0})", rc.ToString("X")));
                }

                remaining -= read;
                chunkSize = Math.Min(remaining, chunkSize);
            }

            SAPIByteArray signature = new SAPIByteArrayClass();

            //Get the final signature
            if ((rc = SAPI.BufferSignEnd (hSes, ctxBuffSign, signature)) != 0)
            {
                SAPI.ContextRelease (ctxBuffSign);
                SAPI.Logoff (hSes);
                SAPI.HandleRelease (hSes);

                throw new Exception(string.Format(
                    "Failed to sign the data (#{0})", rc.ToString("X")));
            }

            //Write signature data to the stream
            byte[] tmpSig = (byte[])signature.ToArray();
            SignatureData.Write (tmpSig, 0, tmpSig.Length);

            //Cleanup memory
            SAPI.ContextRelease (ctxBuffSign);
            SAPI.Logoff (hSes);
            SAPI.HandleRelease (hSes);
        }
コード例 #6
0
        public static SignatureDetails ValidateSignature(Stream SignedData, Stream Signature)
        {
            if (SignedData == null) throw new ArgumentNullException("SignedData");
            if (Signature == null) throw new ArgumentNullException ("Signature");

            //Make sure the SAPI Library is loaded
            SAPIInit();

            SignatureDetails SigDetails = new SignatureDetails();
            int rc;

            SAPICrypt SAPI = new SAPICryptClass();

            SESHandle hSession = new SESHandleClass();
            if ((rc = SAPI.HandleAcquire(out hSession)) != 0)
            {
                throw new Exception(string.Format(
                    "Memory allocation error (#{0})", rc.ToString("X")));
            }

            //Extract Signer Data from the Signature stream

            //Read Signature content from stream to the SAPI bytes array
            Array baSignature = new byte[(int)Signature.Length];
            Signature.Read((byte[])baSignature, 0, (int)Signature.Length);
            SAPIByteArray sSignature = new SAPIByteArrayClass();
            sSignature.FromArray(ref baSignature);

            //SAPIByteArray sSignedData = new SAPIByteArrayClass();
            //Array t1 = (Array)SignedData; sSignedData.FromArray(ref t1);

            object Certificate;
            // Extract the signer's certificate from signature
            SAPI_ENUM_DATA_TYPE SAPIType = SAPI_ENUM_DATA_TYPE.SAPI_ENUM_DATA_TYPE_NONE;
            if ((rc = SAPI.PKCS7BlobGetValue(hSession, sSignature, SAPI_ENUM_PKCS7_FIELD.SAPI_ENUM_PKCS7_FIELD_CERT, out Certificate, ref SAPIType)) != 0)
            {
                SAPI.HandleRelease(hSession);
                throw new Exception(string.Format(
                    "An error occured while extracting the signer's certificate from the signature stream (#{0})", rc.ToString("X")));
            }

            SigDetails.SignerCertificate = new X509Certificate2((byte[])(((SAPIByteArray)Certificate).ToArray()));
            SigDetails.SignerName = SigDetails.SignerCertificate.GetNameInfo (X509NameType.SimpleName, false);
            SigDetails.SignerEmail = SigDetails.SignerCertificate.GetNameInfo (X509NameType.EmailName, false);

            //Run the signature validation process
            SAPIContext ctxValidateSignature = new SAPIContextClass();

            if ((rc = SAPI.BufferVerifySignatureInit (hSession,
                ctxValidateSignature, sSignature, 0)) != 0)
            {
                SAPI.HandleRelease(hSession);
                throw new Exception(string.Format(
                    "An error occured while initializing the signature validation process (#{0})", rc.ToString("X")));
            }

            int remaining = (int) SignedData.Length;
            int chunkMaxSize = 1 << 20; //1MB

            //Calculate first chunk size
            int chunkSize = remaining < chunkMaxSize ?
                remaining : chunkMaxSize;

            while (remaining > 0)
            {
                Array chunk = new byte[chunkSize]; //Read in chunks of 1MB
                int read = SignedData.Read((byte[])chunk, 0, chunkSize);
                if (read <= 0) throw new EndOfStreamException (String.Format("End of stream reached with {0} bytes left to read", remaining));

                //Build SAPI-Compatible byte array
                SAPIByteArray tmpBuff = new SAPIByteArrayClass();
                tmpBuff.FromArray(ref chunk);

                //Add read buffer to the validation calculation
                if ((rc = SAPI.BufferVerifySignatureCont(hSession, ctxValidateSignature, tmpBuff)) != 0)
                {
                    SAPI.ContextRelease(ctxValidateSignature);
                    SAPI.HandleRelease(hSession);

                    throw new Exception(string.Format(
                        "An error occured while validating the digital signature (#{0})", rc.ToString("X")));
                }

                remaining -= read;
                chunkSize = Math.Min(remaining, chunkSize);
            }

            //Get the final validation result
            SAPIFileTime signingTime = new SAPIFileTimeClass();

            rc = SAPI.BufferVerifySignatureEnd(hSession, ctxValidateSignature, signingTime, new CertStatusClass());
            if ((uint)rc == 0x90030360)  //SAPI_SIGNATURE_NOT_VALID
            {
                SigDetails.isValid = false;
                SigDetails.SignatureTimeTicks = 0;
            }
            else if (rc == 0)
            {
                SigDetails.isValid  = true;

                //Convert FILE_TIME to ticks
                ulong filetime = signingTime.HighDateTime;
                filetime <<= 32;
                filetime += signingTime.LowDateTime;
                SigDetails.SignatureTimeTicks = DateTime.FromFileTimeUtc((long)filetime).Ticks;
            }
            else
            {
                SAPI.ContextRelease(ctxValidateSignature);
                SAPI.HandleRelease(hSession);

                throw new Exception(string.Format(
                    "Failed to validate Digital Signature (#{0})", rc.ToString("X")));
            }

            //Cleanup memory
            SAPI.ContextRelease(ctxValidateSignature);
            SAPI.HandleRelease(hSession);

            return SigDetails;
        }