如何使用x509证书验证签名？

Question

我花了2天的时间试图了解如何使用x509作为密钥来验证xml签名，但没有成功。

你能解释一下怎么做吗？ 我应该使用哪些信息来验证签名。 我最不了解的是应该使用哪个证书。

有关信息，我在C中使用openssl lib。

这是我的XML文件的示例：

<?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
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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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        </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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        </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>
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        <ds:X509Data>
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5yeuD8d+foFVYVmIR71pHFrJ6tRzuRDwqWdVNQa6/kk3pS1Lut7AWpmNirjIhKWJgDW57KlDGIsw
Bw/YZzykpHYmuzBxLriBb5TYsWziILI=</ds:X509Certificate>
        </ds:X509Data>
    </ds:KeyInfo>
  </ds:Signature>
</CompositionPlaylist>

提前致谢。

Answer 1

您应该（实际上必须）不要从头开始编写XML签名验证，因为它既困难又容易出错。 使用类似xmlsec的库： https : xmlsec 。