作法：變更 X.509 憑證私密金鑰的密碼編譯提供者

發行項
05/22/2023

本主題將說明如何變更用於提供 X.509 憑證之私密金鑰的密碼編譯提供者，以及如何將提供者整合至 Windows Communication Foundation (WCF) 安全性架構中。如需使用憑證的詳細資訊，請參閱使用憑證。

WCF 安全性架構提供導入新安全性權杖類型的方式，如如何：建立自訂權杖中所述。也可以使用自訂權杖來取代現有由系統提供的權杖型別。

在本主題中，系統提供的 X.509 安全性權杖會由自訂 X.509 權杖取代，為憑證私密金鑰提供不同的實作。在實際的私密金鑰是由與預設 Windows 密碼編譯提供者不同的密碼編譯提供者所提供的案例中，這十分有用。替代密碼編譯提供者的其中一個範例是硬體安全性模組，它執行所有私密金鑰相關密碼編譯作業，且不會將私密金鑰儲存在記憶體中，因而增強系統的安全性。

下列範例僅供示範之用。它不會取代預設的 Windows 密碼編譯提供者，但會顯示可以整合此類提供者之處。

程序

每個具有相關安全性金鑰的安全性權杖都必須實作 SecurityKeys 屬性，它會從安全性權杖執行個體傳回金鑰的集合。如果權杖是 X.509 安全性權杖，集合就會包含 X509AsymmetricSecurityKey 類別的單一執行個體，表示與憑證有關聯的公開和私密金鑰。如果要取代用於提供憑證金鑰的預設密碼編譯提供者，請建立這個類別的新實作。

建立自訂 X.509 非對稱金鑰

定義衍生自 X509AsymmetricSecurityKey 類別的新類別。
覆寫 KeySize 唯讀屬性。這個屬性會傳回憑證之公開/私密金鑰組的實際金鑰大小。
覆寫 DecryptKey 方法。這個方法是由 WCF 安全性架構所呼叫，以使用憑證的私密金鑰來解密對稱金鑰 (金鑰之前是使用憑證的公開金鑰來加密)。
覆寫 GetAsymmetricAlgorithm 方法。這個方法是由 WCF 安全性架構所呼叫，以取得 AsymmetricAlgorithm 類別的執行個體，表示憑證之私密或公開金鑰的密碼編譯提供者，這要視傳遞至方法的參數而定。
選擇性。覆寫 GetHashAlgorithmForSignature 方法。如果需要 HashAlgorithm 類別的不同實作，請覆寫這個方法。
覆寫 GetSignatureFormatter 方法。這個方法會傳回與憑證私密金鑰有關聯之 AsymmetricSignatureFormatter 類別的執行個體。

覆寫 IsSupportedAlgorithm 方法。這個方法是用於指出安全性金鑰實作是否支援特定的密碼編譯演算法。

class CustomX509AsymmetricSecurityKey : X509AsymmetricSecurityKey
{
    X509Certificate2 certificate;
    object thisLock = new Object();
    bool privateKeyAvailabilityDetermined;
    AsymmetricAlgorithm privateKey;
    PublicKey publicKey;

    public CustomX509AsymmetricSecurityKey(X509Certificate2 certificate)
        : base(certificate)
    {
        this.certificate = certificate;
    }

    public override int KeySize
    {
        get { return this.PublicKey.Key.KeySize; }
    }

    AsymmetricAlgorithm PrivateKey
    {
        // You need to modify this to obtain the private key using a different cryptographic
        // provider if you do not want to use the default provider.
        get
        {
            if (!this.privateKeyAvailabilityDetermined)
            {
                lock (ThisLock)
                {
                    if (!this.privateKeyAvailabilityDetermined)
                    {
                        this.privateKey = this.certificate.PrivateKey;
                        this.privateKeyAvailabilityDetermined = true;
                    }
                }
            }
            return this.privateKey;
        }
    }

    PublicKey PublicKey
    {
        get
        {
            if (this.publicKey == null)
            {
                lock (ThisLock)
                {
                    this.publicKey ??= this.certificate.PublicKey;
                }
            }
            return this.publicKey;
        }
    }

    Object ThisLock
    {
        get
        {
            return thisLock;
        }
    }

    public override byte[] DecryptKey(string algorithm, byte[] keyData)
    {
        // You can decrypt the key only if you have the private key in the certificate.
        if (this.PrivateKey == null)
        {
            throw new NotSupportedException("Missing private key");
        }

        RSA rsa = this.PrivateKey as RSA;
        if (rsa == null)
        {
            throw new NotSupportedException("Private key cannot be used with RSA algorithm");
        }

        // Support exchange keySpec, AT_EXCHANGE ?
        if (rsa.KeyExchangeAlgorithm == null)
        {
            throw new NotSupportedException("Private key does not support key exchange");
        }

        switch (algorithm)
        {
            case EncryptedXml.XmlEncRSA15Url:
                return EncryptedXml.DecryptKey(keyData, rsa, false);

            case EncryptedXml.XmlEncRSAOAEPUrl:
                return EncryptedXml.DecryptKey(keyData, rsa, true);

            default:
                throw new NotSupportedException(String.Format("Algorithm {0} is not supported", algorithm));
        }
    }

    public override AsymmetricAlgorithm GetAsymmetricAlgorithm(string algorithm, bool privateKey)
    {
        if (privateKey)
        {
            if (this.PrivateKey == null)
            {
                throw new NotSupportedException("Missing private key");
            }

            switch (algorithm)
            {
                case SignedXml.XmlDsigDSAUrl:
                    if ((this.PrivateKey as DSA) != null)
                    {
                        return (this.PrivateKey as DSA);
                    }
                    throw new NotSupportedException("Private key cannot be used with DSA");

                case SignedXml.XmlDsigRSASHA1Url:
                case EncryptedXml.XmlEncRSA15Url:
                case EncryptedXml.XmlEncRSAOAEPUrl:
                    if ((this.PrivateKey as RSA) != null)
                    {
                        return (this.PrivateKey as RSA);
                    }
                    throw new NotSupportedException("Private key cannot be used with RSA");
                default:
                    throw new NotSupportedException(String.Format("Algorithm {0} is not supported", algorithm));
            }
        }
        else
        {
            switch (algorithm)
            {
                case SignedXml.XmlDsigDSAUrl:
                    if ((this.PublicKey.Key as DSA) != null)
                    {
                        return (this.PublicKey.Key as DSA);
                    }
                    throw new NotSupportedException("Public key cannot be used with DSA");
                case SignedXml.XmlDsigRSASHA1Url:
                case EncryptedXml.XmlEncRSA15Url:
                case EncryptedXml.XmlEncRSAOAEPUrl:
                    if ((this.PublicKey.Key as RSA) != null)
                    {
                        return (this.PublicKey.Key as RSA);
                    }
                    throw new NotSupportedException("Public key cannot be used with RSA");
                default:
                    throw new NotSupportedException(String.Format("Algorithm {0} is not supported", algorithm));
            }
        }
    }

    public override HashAlgorithm GetHashAlgorithmForSignature(string algorithm)
    {
        if (!this.IsSupportedAlgorithm(algorithm))
        {
            throw new NotSupportedException(String.Format("Algorithm {0} is not supported", algorithm));
        }

        switch (algorithm)
        {
            case SignedXml.XmlDsigDSAUrl:
            case SignedXml.XmlDsigRSASHA1Url:
                return new SHA1Managed();
            default:
                throw new NotSupportedException(String.Format("Algorithm {0} is not supported", algorithm));
        }
    }

    public override AsymmetricSignatureFormatter GetSignatureFormatter(string algorithm)
    {
        // The signature can be created only if the private key is present.
        if (this.PrivateKey == null)
        {
            throw new NotSupportedException("Private key is missing");
        }

        // Only one of the two algorithms is supported, not both.
        //     XmlDsigDSAUrl = "http://www.w3.org/2000/09/xmldsig#dsa-sha1";
        //     XmlDsigRSASHA1Url = "http://www.w3.org/2000/09/xmldsig#rsa-sha1";
        switch (algorithm)
        {
            case SignedXml.XmlDsigDSAUrl:

                // Ensure that this is a DSA algorithm object.
                DSA dsa = (this.PrivateKey as DSA);
                if (dsa == null)
                {
                    throw new NotSupportedException("Private key cannot be used DSA");
                }

                return new DSASignatureFormatter(dsa);

            case SignedXml.XmlDsigRSASHA1Url:
                // Ensure that this is an RSA algorithm object.
                RSA rsa = (this.PrivateKey as RSA);
                if (rsa == null)
                {
                    throw new NotSupportedException("Private key cannot be used RSA");
                }

                return new RSAPKCS1SignatureFormatter(rsa);
            default:
                throw new NotSupportedException(String.Format("Algorithm {0} is not supported", algorithm));
        }
    }

    public override bool IsSupportedAlgorithm(string algorithm)
    {
        switch (algorithm)
        {
            case SignedXml.XmlDsigDSAUrl:
                return (this.PublicKey.Key is DSA);

            case SignedXml.XmlDsigRSASHA1Url:
            case EncryptedXml.XmlEncRSA15Url:
            case EncryptedXml.XmlEncRSAOAEPUrl:
                return (this.PublicKey.Key is RSA);

            default:
                return false;
        }
    }
}

Friend Class CustomX509AsymmetricSecurityKey
    Inherits X509AsymmetricSecurityKey

    Private _certificate As X509Certificate2
    Private _thisLock As New Object()
    Private _privateKeyAvailabilityDetermined As Boolean
    Private _privateKey As AsymmetricAlgorithm
    Private _publicKey As PublicKey

    Public Sub New(ByVal certificate As X509Certificate2)
        MyBase.New(certificate)
        Me._certificate = certificate
    End Sub

    Public Overrides ReadOnly Property KeySize() As Integer
        Get
            Return Me.PublicKey.Key.KeySize
        End Get
    End Property

    Private Overloads ReadOnly Property PrivateKey() As AsymmetricAlgorithm
        ' You need to modify this to obtain the private key using a different cryptographic
        ' provider if you do not want to use the default provider.
        Get
            If Not Me._privateKeyAvailabilityDetermined Then
                SyncLock ThisLock
                    If Not Me._privateKeyAvailabilityDetermined Then
                        Me._privateKey = Me._certificate.PrivateKey
                        Me._privateKeyAvailabilityDetermined = True
                    End If
                End SyncLock
            End If
            Return Me._privateKey
        End Get
    End Property

    Private Overloads ReadOnly Property PublicKey() As PublicKey
        Get
            If Me._publicKey Is Nothing Then
                SyncLock ThisLock
                    If Me._publicKey Is Nothing Then
                        Me._publicKey = Me._certificate.PublicKey
                    End If
                End SyncLock
            End If
            Return Me._publicKey
        End Get
    End Property

    Private Overloads ReadOnly Property ThisLock() As Object
        Get
            Return _thisLock
        End Get
    End Property

    Public Overrides Function DecryptKey(ByVal algorithm As String, _
                                         ByVal keyData() As Byte) As Byte()
        ' You can decrypt the key only if you have the private key in the certificate.
        If Me.PrivateKey Is Nothing Then
            Throw New NotSupportedException("Missing private key")
        End If

        Dim rsa = TryCast(Me.PrivateKey, RSA)
        If rsa Is Nothing Then
            Throw New NotSupportedException("Private key cannot be used with RSA algorithm")
        End If

        ' Support exchange keySpec, AT_EXCHANGE ?
        If rsa.KeyExchangeAlgorithm Is Nothing Then
            Throw New NotSupportedException("Private key does not support key exchange")
        End If

        Select Case algorithm
            Case EncryptedXml.XmlEncRSA15Url
                Return EncryptedXml.DecryptKey(keyData, rsa, False)

            Case EncryptedXml.XmlEncRSAOAEPUrl
                Return EncryptedXml.DecryptKey(keyData, rsa, True)

            Case Else
                Throw New NotSupportedException(String.Format("Algorithm {0} is not supported", algorithm))
        End Select
    End Function

    Public Overrides Function GetAsymmetricAlgorithm(ByVal algorithm As String, _
                                                     ByVal privateKey As Boolean) As AsymmetricAlgorithm
        If privateKey Then
            If Me.PrivateKey Is Nothing Then
                Throw New NotSupportedException("Missing private key")
            End If

            Select Case algorithm
                Case SignedXml.XmlDsigDSAUrl
                    If TryCast(Me.PrivateKey, DSA) IsNot Nothing Then
                        Return (TryCast(Me.PrivateKey, DSA))
                    End If
                    Throw New NotSupportedException("Private key cannot be used with DSA")

                Case SignedXml.XmlDsigRSASHA1Url, EncryptedXml.XmlEncRSA15Url, EncryptedXml.XmlEncRSAOAEPUrl
                    If TryCast(Me.PrivateKey, RSA) IsNot Nothing Then
                        Return (TryCast(Me.PrivateKey, RSA))
                    End If
                    Throw New NotSupportedException("Private key cannot be used with RSA")
                Case Else
                    Throw New NotSupportedException(String.Format("Algorithm {0} is not supported", algorithm))
            End Select
        Else
            Select Case algorithm
                Case SignedXml.XmlDsigDSAUrl
                    If TryCast(Me.PublicKey.Key, DSA) IsNot Nothing Then
                        Return (TryCast(Me.PublicKey.Key, DSA))
                    End If
                    Throw New NotSupportedException("Public key cannot be used with DSA")
                Case SignedXml.XmlDsigRSASHA1Url, EncryptedXml.XmlEncRSA15Url, EncryptedXml.XmlEncRSAOAEPUrl
                    If TryCast(Me.PublicKey.Key, RSA) IsNot Nothing Then
                        Return (TryCast(Me.PublicKey.Key, RSA))
                    End If
                    Throw New NotSupportedException("Public key cannot be used with RSA")
                Case Else
                    Throw New NotSupportedException(String.Format("Algorithm {0} is not supported", algorithm))
            End Select
        End If
    End Function

    Public Overrides Function GetHashAlgorithmForSignature(ByVal algorithm As String) As HashAlgorithm
        If Not Me.IsSupportedAlgorithm(algorithm) Then
            Throw New NotSupportedException(String.Format("Algorithm {0} is not supported", algorithm))
        End If

        Select Case algorithm
            Case SignedXml.XmlDsigDSAUrl, SignedXml.XmlDsigRSASHA1Url
                Return New SHA1Managed()
            Case Else
                Throw New NotSupportedException(String.Format("Algorithm {0} is not supported", algorithm))
        End Select
    End Function

    Public Overrides Function GetSignatureFormatter(ByVal algorithm As String) As AsymmetricSignatureFormatter
        ' The signature can be created only if the private key is present.
        If Me.PrivateKey Is Nothing Then
            Throw New NotSupportedException("Private key is missing")
        End If

        ' Only one of the two algorithms is supported, not both.
        '     XmlDsigDSAUrl = "http://www.w3.org/2000/09/xmldsig#dsa-sha1";
        '     XmlDsigRSASHA1Url = "http://www.w3.org/2000/09/xmldsig#rsa-sha1";
        Select Case algorithm
            Case SignedXml.XmlDsigDSAUrl

                ' Ensure that this is a DSA algorithm object.
                Dim dsa = (TryCast(Me.PrivateKey, DSA))
                If dsa Is Nothing Then
                    Throw New NotSupportedException("Private key cannot be used DSA")
                End If

                Return New DSASignatureFormatter(dsa)

            Case SignedXml.XmlDsigRSASHA1Url
                ' Ensure that this is an RSA algorithm object.
                Dim rsa = (TryCast(Me.PrivateKey, RSA))
                If rsa Is Nothing Then
                    Throw New NotSupportedException("Private key cannot be used RSA")
                End If

                Return New RSAPKCS1SignatureFormatter(rsa)
            Case Else
                Throw New NotSupportedException(String.Format("Algorithm {0} is not supported", algorithm))
        End Select
    End Function

    Public Overrides Function IsSupportedAlgorithm(ByVal algorithm As String) As Boolean
        Select Case algorithm
            Case SignedXml.XmlDsigDSAUrl
                Return (TypeOf Me.PublicKey.Key Is DSA)

            Case SignedXml.XmlDsigRSASHA1Url, EncryptedXml.XmlEncRSA15Url, EncryptedXml.XmlEncRSAOAEPUrl
                Return (TypeOf Me.PublicKey.Key Is RSA)

            Case Else
                Return False
        End Select
    End Function

End Class

下列程序將示範如何整合在上述程序中建立的自訂 X.509 非對稱安全性金鑰實作與 WCF 安全性架構，以便取代系統提供的 X.509 安全性權杖。

使用自訂的 X.509 非對稱安全性金鑰權杖來取代系統提供的 X.509 安全性權杖

請建立自訂 X.509 安全性權杖，它會傳回自訂 X.509 非對稱安全性金鑰而非系統提供的安全性金鑰，如下列範例所示。如需自訂安全性權杖的詳細資訊，請參閱如何：建立自訂權杖。

class CustomX509SecurityToken : X509SecurityToken
{
    ReadOnlyCollection<SecurityKey> securityKeys;
    public CustomX509SecurityToken(X509Certificate2 certificate)
        : base(certificate)
    {
    }

    public override ReadOnlyCollection<SecurityKey> SecurityKeys
    {
        get
        {
            if (this.securityKeys == null)
            {
                List<SecurityKey> temp = new List<SecurityKey>(1);
                temp.Add(new CustomX509AsymmetricSecurityKey(this.Certificate));
                this.securityKeys = temp.AsReadOnly();
            }
            return this.securityKeys;
        }
    }
}

Friend Class CustomX509SecurityToken
    Inherits X509SecurityToken

    Private _securityKeys As ReadOnlyCollection(Of SecurityKey)

    Public Sub New(ByVal certificate As X509Certificate2)
        MyBase.New(certificate)
    End Sub

    Public Overrides ReadOnly Property SecurityKeys() As ReadOnlyCollection(Of SecurityKey)
        Get
            If Me._securityKeys Is Nothing Then
                Dim temp As New List(Of SecurityKey)(1)
                temp.Add(New CustomX509AsymmetricSecurityKey(Me.Certificate))
                Me._securityKeys = temp.AsReadOnly()
            End If
            Return Me._securityKeys
        End Get
    End Property

End Class

請建立會傳回自訂 X.509 安全性權杖的自訂安全性權杖提供者，如範例所示。如需自訂安全性權杖提供者的詳細資訊，請參閱如何：建立自訂安全性權杖提供者。

class CustomX509SecurityTokenProvider : SecurityTokenProvider
{
    X509Certificate2 certificate;

    public CustomX509SecurityTokenProvider(X509Certificate2 certificate)
    {
        this.certificate = certificate;
    }

    protected override SecurityToken GetTokenCore(TimeSpan timeout)
    {
        return new CustomX509SecurityToken(certificate);
    }
}

Friend Class CustomX509SecurityTokenProvider
    Inherits SecurityTokenProvider

    Private _certificate As X509Certificate2

    Public Sub New(ByVal certificate As X509Certificate2)
        Me._certificate = certificate
    End Sub

    Protected Overrides Function GetTokenCore(ByVal timeout As TimeSpan) As SecurityToken
        Return New CustomX509SecurityToken(_certificate)
    End Function
End Class

如果自訂安全性金鑰需要用在啟動器端，請建立自訂用戶端安全性權杖管理員和自訂用戶端認證類別，如下列範例所示。如需自訂用戶端認證和用戶端安全性權杖管理員的詳細資訊，請參閱逐步解說：建立自訂用戶端和服務認證。

class CustomClientSecurityTokenManager : ClientCredentialsSecurityTokenManager
{
    CustomClientCredentials credentials;

    public CustomClientSecurityTokenManager(CustomClientCredentials credentials)
        : base(credentials)
    {
        this.credentials = credentials;
    }

    public override SecurityTokenProvider CreateSecurityTokenProvider(SecurityTokenRequirement tokenRequirement)
    {
        SecurityTokenProvider result = null;

        if (tokenRequirement.TokenType == SecurityTokenTypes.X509Certificate)
        {
            MessageDirection direction = tokenRequirement.GetProperty<MessageDirection>(ServiceModelSecurityTokenRequirement.MessageDirectionProperty);
            if (direction == MessageDirection.Output)
            {
                if (tokenRequirement.KeyUsage == SecurityKeyUsage.Signature)
                {
                    result = new CustomX509SecurityTokenProvider(credentials.ClientCertificate.Certificate);
                }
            }
            else
            {
                if (tokenRequirement.KeyUsage == SecurityKeyUsage.Exchange)
                {
                    result = new CustomX509SecurityTokenProvider(credentials.ClientCertificate.Certificate);
                }
            }
        }

        result ??= base.CreateSecurityTokenProvider(tokenRequirement);
        return result;
    }
}

Friend Class CustomClientSecurityTokenManager
    Inherits ClientCredentialsSecurityTokenManager

    Private credentials As CustomClientCredentials

    Public Sub New(ByVal credentials As CustomClientCredentials)
        MyBase.New(credentials)
        Me.credentials = credentials
    End Sub

    Public Overrides Function CreateSecurityTokenProvider(ByVal tokenRequirement As SecurityTokenRequirement) _
    As SecurityTokenProvider
        Dim result As SecurityTokenProvider = Nothing

        If tokenRequirement.TokenType = SecurityTokenTypes.X509Certificate Then
            Dim direction = tokenRequirement.GetProperty(Of MessageDirection) _
            (ServiceModelSecurityTokenRequirement.MessageDirectionProperty)
            If direction = MessageDirection.Output Then
                If tokenRequirement.KeyUsage = SecurityKeyUsage.Signature Then
                    result = New CustomX509SecurityTokenProvider(credentials.ClientCertificate.Certificate)
                End If
            Else
                If tokenRequirement.KeyUsage = SecurityKeyUsage.Exchange Then
                    result = New CustomX509SecurityTokenProvider(credentials.ClientCertificate.Certificate)
                End If
            End If
        End If

        If result Is Nothing Then
            result = MyBase.CreateSecurityTokenProvider(tokenRequirement)
        End If
        Return result
    End Function
End Class

public class CustomClientCredentials : ClientCredentials
{
    public CustomClientCredentials()
    {
    }

    protected CustomClientCredentials(CustomClientCredentials other)
        : base(other)
    {
    }

    protected override ClientCredentials CloneCore()
    {
        return new CustomClientCredentials(this);
    }

    public override SecurityTokenManager CreateSecurityTokenManager()
    {
        return new CustomClientSecurityTokenManager(this);
    }
}

Public Class CustomClientCredentials
    Inherits ClientCredentials

    Public Sub New()
    End Sub

    Protected Sub New(ByVal other As CustomClientCredentials)
        MyBase.New(other)
    End Sub

    Protected Overrides Function CloneCore() As ClientCredentials
        Return New CustomClientCredentials(Me)
    End Function

    Public Overrides Function CreateSecurityTokenManager() As SecurityTokenManager
        Return New CustomClientSecurityTokenManager(Me)
    End Function
End Class

如果自訂安全性金鑰需要用在收件者端，請建立自訂服務安全性權杖管理員和自訂服務認證，如下列範例所示。如需自訂服務認證和服務安全性權杖管理員的詳細資訊，請參閱逐步解說：建立自訂用戶端和服務認證。

class CustomServiceSecurityTokenManager : ServiceCredentialsSecurityTokenManager
{
    CustomServiceCredentials credentials;

    public CustomServiceSecurityTokenManager(CustomServiceCredentials credentials)
        : base(credentials)
    {
        this.credentials = credentials;
    }

    public override SecurityTokenProvider CreateSecurityTokenProvider(SecurityTokenRequirement tokenRequirement)
    {
        SecurityTokenProvider result = null;

        if (tokenRequirement.TokenType == SecurityTokenTypes.X509Certificate)
        {
            MessageDirection direction = tokenRequirement.GetProperty<MessageDirection>(ServiceModelSecurityTokenRequirement.MessageDirectionProperty);
            if (direction == MessageDirection.Input)
            {
                if (tokenRequirement.KeyUsage == SecurityKeyUsage.Exchange)
                {
                    result = new CustomX509SecurityTokenProvider(credentials.ServiceCertificate.Certificate);
                }
            }
            else
            {
                if (tokenRequirement.KeyUsage == SecurityKeyUsage.Signature)
                {
                    result = new CustomX509SecurityTokenProvider(credentials.ServiceCertificate.Certificate);
                }
            }
        }

        result ??= base.CreateSecurityTokenProvider(tokenRequirement);
        return result;
    }
}

Friend Class CustomServiceSecurityTokenManager
    Inherits ServiceCredentialsSecurityTokenManager

    Private credentials As CustomServiceCredentials

    Public Sub New(ByVal credentials As CustomServiceCredentials)
        MyBase.New(credentials)
        Me.credentials = credentials
    End Sub

    Public Overrides Function CreateSecurityTokenProvider(ByVal tokenRequirement As SecurityTokenRequirement) As SecurityTokenProvider
        Dim result As SecurityTokenProvider = Nothing

        If tokenRequirement.TokenType = SecurityTokenTypes.X509Certificate Then
            Dim direction = tokenRequirement.GetProperty(Of MessageDirection) _
            (ServiceModelSecurityTokenRequirement.MessageDirectionProperty)
            If direction = MessageDirection.Input Then
                If tokenRequirement.KeyUsage = SecurityKeyUsage.Exchange Then
                    result = New CustomX509SecurityTokenProvider(credentials.ServiceCertificate.Certificate)
                End If
            Else
                If tokenRequirement.KeyUsage = SecurityKeyUsage.Signature Then
                    result = New CustomX509SecurityTokenProvider(credentials.ServiceCertificate.Certificate)
                End If
            End If
        End If

        If result Is Nothing Then
            result = MyBase.CreateSecurityTokenProvider(tokenRequirement)
        End If
        Return result
    End Function
End Class

public class CustomServiceCredentials : ServiceCredentials
{
    public CustomServiceCredentials()
    {
    }

    protected CustomServiceCredentials(CustomServiceCredentials other)
        : base(other)
    {
    }

    protected override ServiceCredentials CloneCore()
    {
        return new CustomServiceCredentials(this);
    }

    public override SecurityTokenManager CreateSecurityTokenManager()
    {
        return new CustomServiceSecurityTokenManager(this);
    }
}

Public Class CustomServiceCredentials
    Inherits ServiceCredentials

    Public Sub New()
    End Sub

    Protected Sub New(ByVal other As CustomServiceCredentials)
        MyBase.New(other)
    End Sub

    Protected Overrides Function CloneCore() As ServiceCredentials
        Return New CustomServiceCredentials(Me)
    End Function

    Public Overrides Function CreateSecurityTokenManager() As SecurityTokenManager
        Return New CustomServiceSecurityTokenManager(Me)
    End Function

End Class

共用方式為

作法：變更 X.509 憑證私密金鑰的密碼編譯提供者

程序

建立自訂 X.509 非對稱金鑰

使用自訂的 X.509 非對稱安全性金鑰權杖來取代系統提供的 X.509 安全性權杖

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