LoadSignatures

LoadSignatures(string)

Loads digital signatures from document.

public static DigitalSignatureCollection LoadSignatures(string fileName)
ParameterTypeDescription
fileNameStringPath to the document.

Return Value

Collection of digital signatures. Returns empty collection if file is not signed.

Examples

Shows how to load signatures from a digitally signed document.

// There are two ways of loading a signed document's collection of digital signatures using the DigitalSignatureUtil class.
// 1 -  Load from a document from a local file system filename:
DigitalSignatureCollection digitalSignatures = 
    DigitalSignatureUtil.LoadSignatures(MyDir + "Digitally signed.docx");

// If this collection is nonempty, then we can verify that the document is digitally signed.
Assert.AreEqual(1, digitalSignatures.Count);

// 2 -  Load from a document from a FileStream:
using (Stream stream = new FileStream(MyDir + "Digitally signed.docx", FileMode.Open))
{
    digitalSignatures = DigitalSignatureUtil.LoadSignatures(stream);
    Assert.AreEqual(1, digitalSignatures.Count);
}

Shows how to remove digital signatures from a digitally signed document.

// There are two ways of using the DigitalSignatureUtil class to remove digital signatures
// from a signed document by saving an unsigned copy of it somewhere else in the local file system.
// 1 - Determine the locations of both the signed document and the unsigned copy by filename strings:
DigitalSignatureUtil.RemoveAllSignatures(MyDir + "Digitally signed.docx",
    ArtifactsDir + "DigitalSignatureUtil.LoadAndRemove.FromString.docx");

// 2 - Determine the locations of both the signed document and the unsigned copy by file streams:
using (Stream streamIn = new FileStream(MyDir + "Digitally signed.docx", FileMode.Open))
{
    using (Stream streamOut = new FileStream(ArtifactsDir + "DigitalSignatureUtil.LoadAndRemove.FromStream.docx", FileMode.Create))
    {
        DigitalSignatureUtil.RemoveAllSignatures(streamIn, streamOut);
    }
}

// Verify that both our output documents have no digital signatures.
Assert.AreEqual(0, DigitalSignatureUtil.LoadSignatures(ArtifactsDir + "DigitalSignatureUtil.LoadAndRemove.FromString.docx").Count);
Assert.AreEqual(0, DigitalSignatureUtil.LoadSignatures(ArtifactsDir + "DigitalSignatureUtil.LoadAndRemove.FromStream.docx").Count);

See Also

LoadSignatures(Stream)

Loads digital signatures from document using stream.

public static DigitalSignatureCollection LoadSignatures(Stream stream)
ParameterTypeDescription
streamStreamStream with the document.

Return Value

Collection of digital signatures. Returns empty collection if file is not signed.

Examples

Shows how to load signatures from a digitally signed document.

// There are two ways of loading a signed document's collection of digital signatures using the DigitalSignatureUtil class.
// 1 -  Load from a document from a local file system filename:
DigitalSignatureCollection digitalSignatures = 
    DigitalSignatureUtil.LoadSignatures(MyDir + "Digitally signed.docx");

// If this collection is nonempty, then we can verify that the document is digitally signed.
Assert.AreEqual(1, digitalSignatures.Count);

// 2 -  Load from a document from a FileStream:
using (Stream stream = new FileStream(MyDir + "Digitally signed.docx", FileMode.Open))
{
    digitalSignatures = DigitalSignatureUtil.LoadSignatures(stream);
    Assert.AreEqual(1, digitalSignatures.Count);
}

See Also

DigitalSignatureUtil.RemoveAllSignatures