GetSignedElement Method (original) (raw)
Summary
Returns the signed Data Element at the specified index.
Syntax
Parameters
signatureItem
The Digital Signatures Sequence Item that corresponds to the Digital Signature. This cannot be null.
index
The zero-based index of the required signed Data Element. This should be a number from 0 to GetSignedElementsCount(signatureItem) - 1.
Return Value
The required signed Data Element. The return value can be a null reference (Nothing in VB); e.g., if the specified index is invalid.
Example
using Leadtools;
using Leadtools.Dicom;
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)
{
Console.WriteLine("Sample: The Digital Signature was verified.");
}
else
{
Console.WriteLine("Sample: All Digital Signatures were verified (if there are any).");
}
}
else
{
if (signatureItem != null)
{
Console.WriteLine("Sample: The Digital Signature is invalid.");
}
else
{
Console.WriteLine("Sample: At least one Digital Signature is invalid.");
}
}
// 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}/{2} {3}:{4}:{5}.{6} {7}{8}{9}",
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);
Console.WriteLine($"Sample: {msg.ToString()}");
dataset.SaveCertificate(signatureItem, Path.Combine(LEAD_VARS.ImagesDir, "CertOfSigner.cer"), DicomCertificateFormat.Pem);
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images";
}