XML数字签名Java

我需要在JAVA中对我的 XML消息进行数字签名：
生成的XML签名应具有以下格式：

<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/2001/04/xmldsig-more#rsa-sha256" />
<Reference URI="">
<Transforms>
<Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
</Transforms>
<DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" />
<DigestValue>DsP5NLca+plhp9tZvGwykfb2whQYt3CQ5sbsVd9Q9aE=</DigestValue>
</Reference>
</SignedInfo>
<SignatureValue>
LrfE0po3YPvVxB/m77iBWWiR07Ghiuhuj7tO2C2LKqZK2cLrAiidt+3tjbJ3m16quCFxfh7bmjRtJsGi7a3HKtK
qY4auqrjNB62AtYrxvm+7Qd/cRacom4e3M9uF9JD1zTfoGun9w4WDfDrDaoZ+ZwUgNtf6sTYO5Ctcj5sYcD0=
</SignatureValue>
<KeyInfo>
<KeyName>7D665C81ABBE1A7D0E525BFC171F04D276F07BF2</KeyName>
</KeyInfo>
</Signature>

任何人都可以提供一些代码帮助？

编辑：

我想出了这段代码：

private static Document sign(Document doc) throws InstantiationException,IllegalAccessException,ClassNotFoundException,NoSuchAlgorithmException,InvalidAlgorithmParameterException,KeyException,MarshalException,XMLSignatureException,FileNotFoundException,TransformerException {

        String providerName = System.getProperty("jsr105Provider","org.jcp.xml.dsig.internal.dom.XMLDSigRI");

        XMLSignatureFactory fac = XMLSignatureFactory.getInstance("DOM",(Provider) Class.forName(providerName).newInstance());

        Reference ref = fac.newReference("",fac.newDigestMethod(DigestMethod.SHA256,null));

        // Create the SignedInfo
        SignedInfo si = fac.newSignedInfo(
                fac.newCanonicalizationMethod(CanonicalizationMethod.EXCLUSIVE,(C14NMethodParameterSpec) null),fac.newSignatureMethod(SignatureMethod.RSA_SHA1,null),Collections.singletonList(ref));

        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(512);
        KeyPair kp = kpg.generateKeyPair();

        KeyInfoFactory kif = fac.getKeyInfoFactory();
        KeyValue kv = kif.newKeyValue(kp.getPublic());

        KeyInfo ki = kif.newKeyInfo(Collections.singletonList(kv));

        DOMSignContext dsc = new DOMSignContext(kp.getPrivate(),doc.getDocumentElement());

        XMLSignature signature = fac.newXMLSignature(si,ki);
        signature.sign(dsc);

        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer trans = tf.newTransformer();
        trans.transform(new DOMSource(doc),new StreamResult(new FileOutputStream("mySignedFile")));

        return doc;
    }

但问题是我得到了：

<SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>

并不是：

<SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256" />

这是解决方案：

我在这个链接上找到它
http://mail-archives.apache.org/mod_mbox/santuario-dev/200907.mbox/%3C4A704241.9060806@sun.com%3E
问题是RSA-SHA256算法：

这是结果代码：

private static Document sign(Document doc) throws InstantiationException,(Provider) Class.forName(providerName).newInstance());

        DigestMethod digestMethod = fac.newDigestMethod(DigestMethod.SHA256,null);
        Transform transform = fac.newTransform(ENVELOPED,(TransformParameterSpec) null);
        Reference reference = fac.newReference("",digestMethod,singletonList(transform),null,null);
        SignatureMethod signatureMethod = fac.newSignatureMethod("http://www.w3.org/2001/04/xmldsig-more#rsa-sha256",null);
        CanonicalizationMethod canonicalizationMethod = fac.newCanonicalizationMethod(EXCLUSIVE,(C14NMethodParameterSpec) null);

        // Create the SignedInfo
        SignedInfo si = fac.newSignedInfo(canonicalizationMethod,signatureMethod,singletonList(reference));


        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(2048);

        KeyPair kp = kpg.generateKeyPair();

        KeyInfoFactory kif = fac.getKeyInfoFactory();
        KeyValue kv = kif.newKeyValue(kp.getPublic());

        // Create a KeyInfo and add the KeyValue to it
        KeyInfo ki = kif.newKeyInfo(Collections.singletonList(kv));
        DOMSignContext dsc = new DOMSignContext(kp.getPrivate(),ki);
        signature.sign(dsc);

        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer trans = tf.newTransformer();

        // output the resulting document
        OutputStream os;

        os = new FileOutputStream("xmlOut.xml");

        trans.transform(new DOMSource(doc),new StreamResult(os));
        return doc;

    }

XML数字签名Java

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