我正在寫一段代碼來驗證X509證書中的簽名,並在主題行中獲得了異常消息。SignedXml.CheckSignature引發異常:值不能爲空。參數名稱:名稱
我的示例代碼
Dim cert As X509Certificate2 = GetCertificate("Certificate Name")
Dim signedXml As SignedXml = New SignedXml(Me.samlResponseXml)
If (signedXml.CheckSignature(cert, True)) Then
' The signature is valid
Else
' The signature is invalid
Throw New ArgumentException("Invalid signature found in Saml Xml.")
End If
我已成功加載證書從我的證書存儲區(代碼1號線)。 我已經成功地填充了signedXml(第二行代碼)。
當我調用signedXml.CheckSignature(cert, True)
函數時會拋出異常。該消息非常不清楚:
值不能爲空。
參數名稱:名稱
任何線索這裏有什麼問題?
的調用堆棧:
System.ArgumentNullException了未處理由用戶代碼
消息=值不能爲空。參數名稱:名稱PARAMNAME =名
源= mscorlib程序堆棧跟蹤: 在System.Security.Cryptography.CryptoConfig.CreateFromName(字符串名稱,對象[]參數)在System.Security.Cryptography.Xml.SignedXml.CheckSignedInfo (AsymmetricAlgorithm鍵) at System.Security.Cryptography.Xml.SignedXml.CheckSignature(AsymmetricAlgorithm key) at System.Security.Cryptography.Xml.SignedXml.CheckSignature(X509Certificate2 certificate,Boolean verifySignatureOnly) at MyNamespace.MyClass.MyFunction()in D: \ Projects \ MyProject \ Test.vb:line 117
Update 1 我打開.Net框架源調試,並且異常是從SignedXml.CheckSignedInfo
方法拋出,存在的代碼線
SignatureDescription signatureDescription = CryptoConfig.CreateFromName(SignatureMethod) as SignatureDescription;
這顯然是是SignatureMethod是的渦卷
public string SignatureMethod {
get { return m_signature.SignedInfo.SignatureMethod; }
}
m_signature.SignedInfo.SignatureMethod
是空值。我再次從MSDN讀取了在http://msdn.microsoft.com/en-us/library/system.security.cryptography.xml.signedxml.signaturemethod.aspx上SignatureMethod的解釋,並檢查了簽名部分粘貼在下面的Xml代碼。我有一個帶有值的SignatureMethod
標籤,但爲什麼SignedXml無法處理它?
<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
<SignedInfo>
<CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" />
<SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
<Reference URI="#_ea559faf-417b-407f-bdc2-bccc76dab76c">
<Transforms>
<Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" />
<Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#">
<InclusiveNamespaces PrefixList="#default samlp saml ds xs xsi" xmlns="http://www.w3.org/2001/10/xml-exc-c14n#" />
</Transform>
</Transforms>
<DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
<DigestValue>fvQx+J90ZGKhwj8Mfhg6v/esOtI=</DigestValue>
</Reference>
</SignedInfo>
<SignatureValue>Ft2mQEA3a39uRq5N94pDI8Y6B/UGLXHkZJ+/besOQmEtZoi630vBDzQfIxx5Djgg6YYeF/s67iF+KLgfvBrHxoe3E8xiqTwBigem41+PJdITlwgrOTkLo2sSdj4DaFdxeN+SCy6KfKXpDBvDyN4i/R0hBKodGwytfzK/DMeOhHU=</SignatureValue>
<KeyInfo>
<X509Data>
<X509Certificate>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</X509Certificate>
</X509Data>
</KeyInfo>
</Signature>
是你發佈了完整的Me.samlResponseXml的XML嗎? AFAIK,您必須找到Signature元素並將其傳遞給LoadXml元素:signedXml.LoadXml(theSignatureElement)。類似於:http://msdn.microsoft.com/en-us/library/kd4wwa16.aspx – 2012-04-08 07:36:30
感謝您的評論,這只是Xml的簽名部分。後來我想出了你的解釋。 – hardywang 2012-04-10 00:16:03