我有一个名为signatures.xml 的文件，它是Adobe AIR 文件的一部分。现在我想解密存储在 XADES 封装时间戳中的信息。如何从加密字符串中获取任何信息？需要使用哪些工具？我是否需要公钥来解密它，我在哪里可以获得它？（作为提示，我认为使用了此证书：https://blogs.oracle.com/mullan/java-applications-that-are-signed-and-timestamped-with-the-geotrust-timestamp-authority-are-不再工作）这是代码：
<xades:QualifyingProperties>
<xades:UnsignedProperties >
<xades:UnsignedSignatureProperties>
<xades:SignatureTimeStamp>
<xades:HashDataInfo uri="#PackageSignatureValue">
<Transforms>
<Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
</Transforms>
<xades:EncapsulatedTimeStamp>
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</xades:EncapsulatedTimeStamp>
</xades:HashDataInfo>
</xades:SignatureTimeStamp>
</xades:UnsignedSignatureProperties>
</xades:UnsignedProperties>
</xades:QualifyingProperties>
</Object>