Public Function VerifySignature( _
   ByVal signatureItem As DicomElement _
) As Boolean

Visual Basic (Usage)	Copy Code
Dim instance As DicomDataSet Dim signatureItem As DicomElement Dim value As Boolean   value = instance.VerifySignature(signatureItem)

public bool VerifySignature( 
   DicomElement signatureItem
)

public: bool VerifySignature( 
   DicomElement* signatureItem
) 

public:
bool VerifySignature( 
   DicomElement^ signatureItem
) 

Parameters

signatureItem

The Digital Signatures Sequence Item that corresponds to the Digital Signature to be verified. To verify all the Digital Signatures in the entire Data Set, set this parameter to null.

Return Value

This example will verify a DICOM digital signature and display its details.

Visual Basic

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Public Sub ExamineSignature(ByVal dataset As DicomDataSet, ByVal signatureItem As DicomElement)   ' Verify the Digital Signature; if pSignatureItem is NULL, the function   ' will verify all the Digital Signatures that exist in the Data Set   Dim ret As Boolean = dataset.VerifySignature(signatureItem)   If ret = True Then     If Not signatureItem Is Nothing Then        MessageBox.Show("The Digital Signature was verified.", "Sample")     Else        MessageBox.Show("All Digital Signatures were verified (if there are any).", "Sample")     End If   Else     If Not signatureItem Is Nothing Then        MessageBox.Show("The Digital Signature is invalid.", "Sample")     Else        MessageBox.Show("At least one Digital Signature is invalid.", "Sample")     End If   End If   ' The Digital Signature UID   Dim msg As StringBuilder = New StringBuilder()   msg.Append(dataset.GetSignatureUID(signatureItem))   ' The Digital Signature DateTime   Dim digitalSignatureDateTime As DicomDateTimeValue = dataset.GetSignatureDateTime(signatureItem)   If digitalSignatureDateTime.IsEmpty = False Then     If (digitalSignatureDateTime.Offset >= 0) Then        msg.AppendFormat(" Digital Signature DateTime:{0}/{1}/{3} {4}:{5}:{6}.{7} {8}{9}{10}", digitalSignatureDateTime.Month, digitalSignatureDateTime.Day, digitalSignatureDateTime.Year, digitalSignatureDateTime.Hours, digitalSignatureDateTime.Minutes, digitalSignatureDateTime.Seconds, digitalSignatureDateTime.Fractions, "+"c, digitalSignatureDateTime.Offset, Environment.NewLine)     Else        msg.AppendFormat(" Digital Signature DateTime:{0}/{1}/{3} {4}:{5}:{6}.{7} {8}{9}{10}", digitalSignatureDateTime.Month, digitalSignatureDateTime.Day, digitalSignatureDateTime.Year, digitalSignatureDateTime.Hours, digitalSignatureDateTime.Minutes, digitalSignatureDateTime.Seconds, digitalSignatureDateTime.Fractions, "-"c, digitalSignatureDateTime.Offset, Environment.NewLine)     End If   End If   Dim macTransferSyntax As String = dataset.GetMacTransferSyntax(signatureItem)   If Not macTransferSyntax Is Nothing Then     msg.AppendFormat("MAC Calculation Transfer Syntax UID: {0}", macTransferSyntax)   End If   Dim macAlgorithm As String = dataset.GetMacAlgorithm(signatureItem)   If Not macAlgorithm Is Nothing Then     msg.AppendFormat("MAC Algorithm: {0}", macAlgorithm)   End If   ' The Data Elements Signed   If dataset.GetSignedElementsCount(signatureItem) > 0 Then     ' We will display only one     Dim element As DicomElement = dataset.GetSignedElement(signatureItem, 0)     msg.AppendFormat(" Data Elements Signed:{0}{1}{1}", element.Tag, Environment.NewLine)   End If   msg.AppendFormat("{0}Do you want to save the Certificate of Signer?", Environment.NewLine)   If MessageBox.Show(msg.ToString(), "Sample", MessageBoxButtons.YesNo) = DialogResult.Yes Then     dataset.SaveCertificate(signatureItem, "C:\CertOfSigner.cer", DicomCertificateFormat.Pem)   End If End Sub

C#

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public void ExamineSignature(DicomDataSet dataset, DicomElement signatureItem)   {     // Verify the Digital Signature; if pSignatureItem is NULL, the function     // will verify all the Digital Signatures that exist in the Data Set     bool ret = dataset.VerifySignature(signatureItem);     if(ret== true)     {        if(signatureItem != null)        {           MessageBox.Show("The Digital Signature was verified.", "Sample");        }        else        {           MessageBox.Show("All Digital Signatures were verified (if there are any).", "Sample");        }     }     else     {        if(signatureItem != null)        {           MessageBox.Show("The Digital Signature is invalid.", "Sample");        }        else        {           MessageBox.Show("At least one Digital Signature is invalid.", "Sample");        }     }     // The Digital Signature UID     StringBuilder msg = new StringBuilder();     msg.Append(dataset.GetSignatureUID(signatureItem));       // The Digital Signature DateTime     DicomDateTimeValue digitalSignatureDateTime = dataset.GetSignatureDateTime(signatureItem);     if(digitalSignatureDateTime.IsEmpty == false)     {        msg.AppendFormat(" Digital Signature DateTime:{0}/{1}/{3} {4}:{5}:{6}.{7} {8}{9}{10}",           digitalSignatureDateTime.Month,           digitalSignatureDateTime.Day,           digitalSignatureDateTime.Year,           digitalSignatureDateTime.Hours,           digitalSignatureDateTime.Minutes,           digitalSignatureDateTime.Seconds,           digitalSignatureDateTime.Fractions,            (digitalSignatureDateTime.Offset >= 0) ? '+' : '-',            digitalSignatureDateTime.Offset,           Environment.NewLine);      }     string macTransferSyntax = dataset.GetMacTransferSyntax(signatureItem);     if(macTransferSyntax != null)     {        msg.AppendFormat("MAC Calculation Transfer Syntax UID: {0}", macTransferSyntax);     }       string macAlgorithm = dataset.GetMacAlgorithm(signatureItem);     if (macAlgorithm != null)     {        msg.AppendFormat("MAC Algorithm: {0}", macAlgorithm);     }     // The Data Elements Signed     if (dataset.GetSignedElementsCount(signatureItem) > 0)      {        // We will display only one        DicomElement element = dataset.GetSignedElement(signatureItem, 0);        msg.AppendFormat(" Data Elements Signed:{0}{1}{1}",element.Tag, Environment.NewLine);     }     msg.AppendFormat("{0}Do you want to save the Certificate of Signer?", Environment.NewLine);     if (MessageBox.Show(msg.ToString(), "Sample", MessageBoxButtons.YesNo) == DialogResult.Yes)     {        dataset.SaveCertificate(signatureItem, @"C:\CertOfSigner.cer", DicomCertificateFormat.Pem);     }  }

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

Reference