我正在尝试按照以下规范验证SAML响应的签名：https://www.w3.org/TR/xmldsig-core/#sec-PKCS1

这是我的工作流程：我收到了SAML响应.我摆脱了签名信封,我将其标准化,检查摘要然后检查签名.我能够成功计算转换后的SAML响应的SHA1摘要并验证它.但是,RSA-SHA1签名检查仍然无法解决.

SAML响应包括签名方法算法：http://www.w3.org/2000/09/xmldsig#rsa-sha1

我有这种方法来检查签名：

public static boolean verifySignature(String signatureType, PublicKey publicKey, byte[] contentBytes, byte[] sigBytes) {
    try {
        Signature sig = Signature.getInstance(signatureType);
        sig.initVerify(publicKey);
        sig.update(contentBytes);
        return sig.verify(sigBytes);
    } catch (Exception e) {
        Logger.log(e);
        return false;
    }
}

我做这样的事情来称呼它：

String publicKeyStr =  "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";
PublicKey publicKey = Security.getPublicKey(publicKeyStr); // uses Certificate class
String sig = "QfAcRJM2P65JucyBpqn6j48/zd1oSLPBJ0lYI1grH5/xenwBEh0D4Eh0S1J3535OUmldpW7D+G7DW6eAT5N8TdoqUvMXuIAUpFHHDR45KZykPXJPUtli+z2rwlCCHypZWnniT/wrcQYdpp1zzNJBBtKdkaqQg0NMktPSQ/0ti+ruMI3qwfTaL9kDQ3Zyi/a2J3RCAPA0RfviLnDLlid0PthiV1NEbs0AvnguDi57fWXAILk0L1Cx20sliQckxlFQ9u4OaHeMscXdjh3SfESkM9m0Y9PppisZWTrCYzGmvDwsZTCBPD3f/ZFIit+Smgh2fi1u8/gZq0yizPyacR3Y/A==";
String newXMLToOperateOn = "<saml2:Assertion xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion" xmlns:xs="http://www.w3.org/2001/XMLSchema" ID="_420cc1a25a3890bd5df1f4c04bd7e986" ...";

boolean sign = Security.verifySignature("SHA1withRSA", pk, newXMLToOperateOn.getBytes(), Util.base64DecodeAsBytes(sig));
// SIGN IS FALSE!!!!

newXMLToOperateOn是SAMLResponse的正确规范化字符串XML.这是我用来生成正确的SHA1摘要. Security.verify()正常工作,因为我用于OpenID SSO检查,并且工作正常.

我还尝试用数据替换而不是整个XML来检查SHA1摘要的字节,但也没有用.例如.验证(algo,pk,sha1Digest.getBytes(),sig.getBytes().

有人可以告诉我,在检查签名时是否有一些我做得非常糟糕的事情？上面链接的规范告诉我签名方法执行此操作：

   CRYPT (PAD (ASN.1 (OID, DIGEST (data))))

当我验证签名时,这对我没有帮助.我无法重新创建签名,因为我无法找到他们在示例中使用的私钥.

谢谢你的帮助.

解决方法:

您只需要验证XML的“SignedInfo”部分