我花了两天的时间尝试了解如何验证xml签名，以x509为关键，但没有成功。
你能解释一下怎么办？我应该使用哪些信息来验证签名。我最不了解的是，我应该使用哪些证书。有关信息，我在C中使用openssl lib。
以下是我的XML文件示例：
<?xml version="1.0" encoding="UTF-8"?>
<CompositionPlaylist xmlns="http://www.smpte-ra.org/schemas/429-7/2006/CPL">
<Id>urn:uuid:7f96aa1a-16bc-4500-a3a6-d5003bbdd826</Id>
<AnnotationText>BLACK-SMPTE_ENC</AnnotationText>
<IssueDate>2011-12-03T15:03:28+01:00</IssueDate>
<Issuer>Doremi Labs, Inc.</Issuer>
<Creator>orca_wrapping 3.2.0</Creator>
<ContentTitleText>BLACK-SMPTE_ENC</ContentTitleText>
<ContentKind>test</ContentKind>
<ContentVersion>
<Id>urn:uuid:0f0d4efc-f1b5-034c-a94e-610e15fe6f2b</Id>
<LabelText>BLACK-SMPTE_ENC</LabelText>
</ContentVersion>
<RatingList/>
<ReelList>
<Reel>
<Id>urn:uuid:4637e047-47ce-46a5-9aa7-de3b6c5b1f82</Id>
<AssetList>
<MainPicture>
<Id>urn:uuid:a06412e1-5cb5-4320-b830-b58f22796d3d</Id>
<EditRate>24 1</EditRate>
<IntrinsicDuration>240</IntrinsicDuration>
<EntryPoint>0</EntryPoint>
<Duration>240</Duration>
<KeyId>urn:uuid:2aad5c28-216d-4e12-9819-2e9e45570fea</KeyId>
<Hash>FaVor2hTsdL2XPKEec59lglmoCo=</Hash>
<FrameRate>24 1</FrameRate>
<ScreenAspectRatio>1998 1080</ScreenAspectRatio>
</MainPicture>
<MainSound>
<Id>urn:uuid:e905c023-b1e5-48af-87af-86d52cb4e61b</Id>
<EditRate>24 1</EditRate>
<IntrinsicDuration>480</IntrinsicDuration>
<EntryPoint>0</EntryPoint>
<Duration>240</Duration>
<KeyId>urn:uuid:be0aac4c-7459-444c-b1a8-5f530af964ff</KeyId>
<Hash>fba3eWGkbugy4XvGMtW9iQsaz5Y=</Hash>
</MainSound>
</AssetList>
</Reel>
</ReelList>
<Signer xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
<ds:X509Data>
<ds:X509IssuerSerial>
<ds:X509IssuerName>dnQualifier=\+LLvuYNO4YBJSp9Jjmlv8oippzQ=,CN=.DC.DMS.DC2.SMPTE,OU=DC.DOREMILABS.COM,O=DC2.SMPTE.DOREMILABS.COM</ds:X509IssuerName>
<ds:X509SerialNumber>180</ds:X509SerialNumber>
</ds:X509IssuerSerial>
<ds:X509SubjectName>dnQualifier=GOnmfwzkUTxhgWRqSfMDX9wMfFo=,CN=CS.DMSJP2K-70056.DC.DC2.SMPTE,OU=DC.DOREMILABS.COM,O=DC2.SMPTE.DOREMILABS.COM</ds:X509SubjectName>
</ds:X509Data>
</Signer>
<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
<ds:SignedInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
<ds:CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
<ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/>
<ds:Reference URI="">
<ds:Transforms>
<ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"></ds:Transform>
</ds:Transforms>
<ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
<ds:DigestValue>HSqtok53pndb+m2Se8621a2ax58=</ds:DigestValue>
</ds:Reference>
</ds:SignedInfo>
<ds:SignatureValue>gSjAym/za1Wcc2Ek65PZ5eHI3LIE8HencGJ9UL+ZVtDJnPcD
BTjRg5pb8S9GFWu9u0ozvnlCoXXc4x23B/6C4elpCz3SOJJ3z1EnU090qcp85zptd+8CDgoc
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QvIL289KbDQTge5NdJrDuxPtF8Raq/L/p24FAnFyfiNWzstH9KEH9YNLNzseFVux9WPsVF0s
JzniaQ==</ds:SignatureValue>
<ds:KeyInfo>
<ds:X509Data>
<ds:X509IssuerSerial>
<ds:X509IssuerName>dnQualifier=\+LLvuYNO4YBJSp9Jjmlv8oippzQ=,CN=.DC.DMS.DC2.SMPTE,OU=DC.DOREMILABS.COM,O=DC2.SMPTE.DOREMILABS.COM</ds:X509IssuerName>
<ds:X509SerialNumber>180</ds:X509SerialNumber>
</ds:X509IssuerSerial>
<ds:X509Certificate>MIIEejCCA2KgAwIBAgICALQwDQYJKoZIhvcNAQELBQAwgYIx
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KVXaBkQQKPWW3AKTg0+SbD0sQdxHxrNKK0SHPtFjpQ==</ds:X509Certificate>
</ds:X509Data>
<ds:X509Data>
<ds:X509IssuerSerial>
<ds:X509IssuerName>dnQualifier=RQ/53RmuLsbzgfPXGlRYmJruwMs=,CN=.DMS.DC2.SMPTE,OU=DC.DOREMILABS.COM,O=DC2.SMPTE.DOREMILABS.COM</ds:X509IssuerName>
<ds:X509SerialNumber>2</ds:X509SerialNumber>
</ds:X509IssuerSerial>
<ds:X509Certificate>MIIEdjCCA16gAwIBAgIBAjANBgkqhkiG9w0BAQsFADB/MSEw
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4zsyE0AGuj2nDstRBWLRy+5SlCByTIKp/PL/</ds:X509Certificate>
</ds:X509Data>
<ds:X509Data>
<ds:X509IssuerSerial>
<ds:X509IssuerName>dnQualifier=pkCB9j5KrAjndhcBkc3fOdfL/BQ=,CN=.PRODUCTS.DC2.SMPTE,OU=DC.DOREMILABS.COM,O=DC2.SMPTE.DOREMILABS.COM</ds:X509IssuerName>
<ds:X509SerialNumber>4</ds:X509SerialNumber>
</ds:X509IssuerSerial>
<ds:X509Certificate>MIIEdDCCA1ygAwIBAgIBBDANBgkqhkiG9w0BAQsFADCBhDEh
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AAVM+A/J+q+14LJqcElnzHkvNTv2Qvp5+g==</ds:X509Certificate>
</ds:X509Data>
<ds:X509Data>
<ds:X509IssuerSerial>
<ds:X509IssuerName>dnQualifier=a/wUIHLuFW7RKXpNQGmQ966xOv8=,CN=.ROOT.DC2.SMPTE,OU=DC.DOREMILABS.COM,O=DC2.SMPTE.DOREMILABS.COM</ds:X509IssuerName>
<ds:X509SerialNumber>2</ds:X509SerialNumber>
</ds:X509IssuerSerial>
<ds:X509Certificate>MIIEdjCCA16gAwIBAgIBAjANBgkqhkiG9w0BAQsFADCBgDEh
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</ds:X509Data>
<ds:X509Data>
<ds:X509IssuerSerial>
<ds:X509IssuerName>dnQualifier=a/wUIHLuFW7RKXpNQGmQ966xOv8=,CN=.ROOT.DC2.SMPTE,OU=DC.DOREMILABS.COM,O=DC2.SMPTE.DOREMILABS.COM</ds:X509IssuerName>
<ds:X509SerialNumber>1</ds:X509SerialNumber>
</ds:X509IssuerSerial>
<ds:X509Certificate>MIIEcjCCA1qgAwIBAgIBATANBgkqhkiG9w0BAQsFADCBgDEh
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Bw/YZzykpHYmuzBxLriBb5TYsWziILI=</ds:X509Certificate>
</ds:X509Data>
</ds:KeyInfo>
</ds:Signature>
</CompositionPlaylist>
提前致谢。