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WCF客户端 - 指定WS-Security时间戳签名的签名算法

c#wcfwcf-clientws-securityxml-signature
9
我有一个 WCF 客户端，它正在发送消息到一个非 WCF 服务，但该服务在处理用于签署 WS-Security 时间戳元素的 HMAC-SHA1 签名方法时出现问题。理想情况下，我们想使用 RSA-SHA1 签名方法，但我无法让 WCF 使用该签名方法。
我正在使用的绑定是自定义绑定，它允许我通过 HTTPS 发送 SAML 2.0 令牌：
<customBinding>
    <!-- This binding is a WS2007FederationHttpBinding without Secure Sessions that uses Text message encoding. -->
    <binding
        name="WS2007FederationHttpBinding_NoSecureSession_Text"
        closeTimeout="00:01:00"
        openTimeout="00:01:00"
        receiveTimeout="00:10:00"
        sendTimeout="00:01:00">
        <security
            authenticationMode="IssuedTokenOverTransport"
            requireSignatureConfirmation="true"
            securityHeaderLayout="Lax"
            messageSecurityVersion="WSSecurity11WSTrustFebruary2005WSSecureConversationFebruary2005WSSecurityPolicy11BasicSecurityProfile10"
            keyEntropyMode="CombinedEntropy"
            includeTimestamp="true">
            <issuedTokenParameters
                tokenType="urn:oasis:names:tc:SAML:2.0:assertion">
                <!-- This describes the STS. That is, the URL, the binding to use, and its Identity -->
                <issuer
                    address="http://hostname//STS.svc"
                    binding="ws2007HttpBinding"
                    bindingConfiguration="StsUserNameBindingConfiguration">
                    <identity>
                        <!-- This is the certificate used for signing on the STS. -->
                        <!-- Replace "sts-signing-certificate-thumbprint" with the actual thumbprint of the STS's signing certificate -->
                        <certificateReference
                            findValue="sts-signing-certificate-thumbprint"
                            storeLocation="LocalMachine"
                                storeName="My"
                                x509FindType="FindByThumbprint"/>
                    </identity>
                </issuer>
            </issuedTokenParameters>

            <!-- This basically says "Don't use Secure Conversation" -->
            <secureConversationBootstrap/>
        </security>

        <!-- Use Text Encoding -->
        <textMessageEncoding/>

        <!-- This says to use HTTPS when communicating with the remote service -->
        <httpsTransport
            requireClientCertificate="true"
            maxBufferPoolSize="134217728"
            maxReceivedMessageSize="134217728"
            maxBufferSize="134217728"/>
    </binding>
</customBinding>

出站请求中的签名如下所示：
<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#hmac-sha1"/>
        <Reference
            URI="#_0">
            <Transforms>
                <Transform
                    Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
            </Transforms>
            <DigestMethod
                Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
            <DigestValue>GZfW1RkyS4DHYFPHRnRuqNSo+qE=</DigestValue>
        </Reference>
    </SignedInfo>
    <SignatureValue>rMzQ/kEV7AXcO3wm9hfQXNoX5r4=</SignatureValue>
    <KeyInfo>
        <o:SecurityTokenReference
            b:TokenType="http://docs.oasis-open.org/wss/oasis-wss-saml-token-profile-1.1#SAMLV2.0"
            xmlns:b="http://docs.oasis-open.org/wss/oasis-wss-wssecurity-secext-1.1.xsd">
            <o:KeyIdentifier
                ValueType="http://docs.oasis-open.org/wss/oasis-wss-saml-token-profile-1.1#SAMLID">_9f79359e-63dc-4e38-888c-6567dac4b41b</o:KeyIdentifier>
        </o:SecurityTokenReference>
    </KeyInfo>
</Signature>

请注意，<SignatureMethod>是http://www.w3.org/2000/09/xmldsig#hmac-sha1。
有趣的是，HMAC-SHA1算法是对称的（一个密钥用于加密和解密），而RSA-SHA1算法是非对称的（需要一个密钥用于加密和另一个密钥用于解密）。我认为WCF使用HMAC-SHA1算法是因为它是对称的，而交换的SAML令牌是共享密钥。使用SAML令牌作为对称算法的共享密钥是有意义的，但是否有可用的选项来强制WCF使用RSA-SHA1这样的非对称算法呢？
我已经通过更改binding/security/defaultAlgorithmSuite属性来获得了一些轻微的签名方法修改，但各种选项并没有让我能够在这里指定RSA-SHA1：
defaultAlgorithm = Default: <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#hmac-sha1"/> <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/> defaultAlgorithm = Basic256: <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#hmac-sha1"/> <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/> defaultAlgorithm = Basic256Rsa15: <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#hmac-sha1"/> <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/> defaultAlgorithm = Basic256Sha256: <SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#hmac-sha256"/> <DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/> defaultAlgorithm = Basic256Sha256Rsa15: <SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#hmac-sha256"/> <DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/> 我能否通过某种方式强制WCF在时间戳签名上使用RSA-SHA1？
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