https://bz.apache.org/bugzilla/show_bug.cgi?id=64773

            Bug ID: 64773
           Summary: cannot sign xlsx files with pictures,Can you add this
                    feature?
           Product: POI
           Version: 4.1.2-FINAL
          Hardware: PC
            Status: NEW
          Severity: normal
          Priority: P2
         Component: POIFS
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

With Office Excel, you can sign xlsx files with pictures, and the label is <
signatureimage >. POI doesn't have this feature. Can you add this feature?
The corresponding contents of xmlsignatures / sig1.xml are as follows:

<Object Id="idOfficeObject"><SignatureProperties><SignatureProperty
Id="idOfficeV1Details" Target="#idPackageSignature"><SignatureInfoV1
xmlns="http://schemas.microsoft.com/office/2006/digsig";><SetupID>{4735669A-1C30-44D4-83AC-553F8632AF22}</SetupID><SignatureText></SignatureText><SignatureImage>AQAAAGwAAAA...AAAAA==</SignatureImage><SignatureComments></SignatureComments><WindowsVersion>10.0</WindowsVersion><OfficeVersion>16.0.13127/21</OfficeVersion><ApplicationVersion>16.0.13127</ApplicationVersion><Monitors>1</Monitors><HorizontalResolution>1920</HorizontalResolution><VerticalResolution>1080</VerticalResolution><ColorDepth>32</ColorDepth><SignatureProviderId>{000CD6A4-0000-0000-C000-000000000046}</SignatureProviderId><SignatureProviderUrl></SignatureProviderUrl><SignatureProviderDetails>29</SignatureProviderDetails><SignatureType>2</SignatureType></SignatureInfoV1></SignatureProperty></SignatureProperties></Object>

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