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Gets the hash method of the checksum of the certificate.
Use this property to read the digest algorithm name stored with the certificate checksum in the signature details returned by Details.
string CertificateDigestMethod { get; }
ReadOnly Property CertificateDigestMethod As String
workbook.Open(GetSignedWorkbookStream());
ISignature signature = workbook.Signatures[0];
IReadOnlySignatureDetails details = signature.Details;
string certificateDigestMethod = details.CertificateDigestMethod;