RemoveAllSignatures

RemoveAllSignatures(string, string)

Removes all digital signatures from source file and writes unsigned file to destination file.

public static void RemoveAllSignatures(string srcFileName, string dstFileName)

Examples

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.That(DigitalSignatureUtil.LoadSignatures(ArtifactsDir + "DigitalSignatureUtil.LoadAndRemove.FromString.docx"), Is.Empty);
Assert.That(DigitalSignatureUtil.LoadSignatures(ArtifactsDir + "DigitalSignatureUtil.LoadAndRemove.FromStream.docx"), Is.Empty);

See Also


RemoveAllSignatures(Stream, Stream)

Removes all digital signatures from document in source stream and writes unsigned document to destination stream.

Output will be written to the start of stream and stream size will be updated with content length.

public static void RemoveAllSignatures(Stream srcStream, Stream dstStream)

Examples

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.That(DigitalSignatureUtil.LoadSignatures(ArtifactsDir + "DigitalSignatureUtil.LoadAndRemove.FromString.docx"), Is.Empty);
Assert.That(DigitalSignatureUtil.LoadSignatures(ArtifactsDir + "DigitalSignatureUtil.LoadAndRemove.FromStream.docx"), Is.Empty);

See Also