encryption - 如何解密 Microsoft Graph 中的 webhook 响应数据？

Question

我已经为我的 Spring Boot 应用程序 (Java) 实现了安全 Web 挂钩功能。

为此，我使用以下 JSON 创建了“订阅”。

String subscriptionMessageTemplate = "{\"changeType\": \"created,updated\",\"notificationUrl\": \"%s/notify/messages\",\"lifecycleNotificationUrl\":\"%s/notify/messages/lifeCycle\", \"resource\": \"/teams/{id}/channels/19:{id}@thread.skype/messages\", \"clientState\": \"secretClientValue\",\"includeResourceData\": true,\"encryptionCertificate\": \"%s\",\"expirationDateTime\":\"%s\",\"encryptionCertificateId\": \"1\"}";

我已将 ngrok 用于公共 IP：

当我从团队发送消息时，我收到以下回复。

{
    "value": [
        {
            "subscriptionId": "76222963-cc7b-42d2-882d-8aaa69cb2ba3",
            "changeType": "created",
            // Other properties typical in a resource change notification
            "resource": "teams('d29828b8-c04d-4e2a-b2f6-07da6982f0f0')/channels('19:[e-mail]')/messages('1565045424600')/replies('1565047490246')",
            "resourceData": {
                "id": "1565293727947",
                "@odata.type": "#Microsoft.Graph.ChatMessage",
                "@odata.id": "teams('88cbc8fc-164b-44f0-b6a6-b59b4a1559d3')/channels('19:[e-mail]2')/messages('1565293727947')/replies('1565293727947')"
            },
            "encryptedContent": {
                "data": "{encrypted data that produces a full resource}",
        "dataSignature": "<HMAC-SHA256 hash>",
                "dataKey": "{encrypted symmetric key from Microsoft Graph}",
                "encryptionCertificateId": "MySelfSignedCert/DDC9651A-D7BC-4D74-86BC-A8923584B0AB",
                "encryptionCertificateThumbprint": "07293748CC064953A3052FB978C735FB89E61C3D"
            }
        }
    ],
    "validationTokens": [
        "eyJ0eXAiOiJKV1QiLCJhbGciOiJSU..."
    ]
}

现在我想解密数据，任何人都可以帮助我如何在Java中解密数据吗？对于证书生成，我使用了我的自定义方法：强文本。

 private void generateSelfSignedX509Certificate(KeyPair keyPair) throws Exception {

    // yesterday
    Date validityBeginDate = new Date(System.currentTimeMillis() - 24 * 60 * 60 * 1000);
    // in 2 years
    Date validityEndDate = new Date(System.currentTimeMillis() + 2 * 365 * 24 * 60 * 60 * 1000);

    // GENERATE THE X509 CERTIFICATE
    X509V1CertificateGenerator certGen = new X509V1CertificateGenerator();
    X500Principal dnName = new X500Principal("CN=John Doe");

    certGen.setSerialNumber(BigInteger.valueOf(System.currentTimeMillis()));
    certGen.setSubjectDN(dnName);
    certGen.setIssuerDN(dnName); // use the same
    certGen.setNotBefore(validityBeginDate);
    certGen.setNotAfter(validityEndDate);
    certGen.setPublicKey(keyPair.getPublic());
    certGen.setSignatureAlgorithm("SHA256WithRSAEncryption");

    this.certificate = certGen.generate(keyPair.getPrivate(), "BC");
}

标签： encryptionmicrosoft-graph-apimicrosoft-graph-teams

Answer 1

我更新了文档以包含 Java 示例。我还将在此处包含示例以供参考，但未来的读者应参考文档，该文档将在其中保持示例的最新状态。
请记住，这些示例是在您拥有从中提取证书的本地 Java 密钥库 (JKS) 的假设下运行的。

解密 AES 密钥：

String storename = ""; //name/path of the jks store
String storepass = ""; //password used to open the jks store
String alias = ""; //alias of the certificate when store in the jks store, should be passed as encryptionCertificateId when subscribing and retrieved from the notification
KeyStore ks = KeyStore.getInstance("JKS");
ks.load(new FileInputStream(storename), storepass.toCharArray());
Key asymmetricKey = ks.getKey(alias, storepass.toCharArray());
byte[] encryptedSymetricKey = Base64.decodeBase64("<value from dataKey property>");
Cipher cipher = Cipher.getInstance("RSA/ECB/OAEPWithSHA1AndMGF1Padding");
cipher.init(Cipher.DECRYPT_MODE, asymmetricKey);
byte[] decryptedSymmetricKey = cipher.doFinal(encryptedSymetricKey);

验证数据签名

byte[] decryptedSymmetricKey = "<the aes key decrypted in the previous step>";
byte[] decodedEncryptedData = Base64.decodeBase64("data property from encryptedContent object");
Mac mac = Mac.getInstance("HMACSHA256");
SecretKey skey = new SecretKeySpec(decryptedSymmetricKey, "HMACSHA256");
mac.init(skey);
byte[] hashedData = mac.doFinal(decodedEncryptedData);
String encodedHashedData = new String(Base64.encodeBase64(hashedData));
if (comparisonSignature.equals(encodedHashedData);)
{
    // Continue with decryption of the encryptedPayload.
}
else
{
    // Do not attempt to decrypt encryptedPayload. Assume notification payload has been tampered with and investigate.
}

解密数据内容

SecretKey skey = new SecretKeySpec(decryptedSymmetricKey, "AES");
IvParameterSpec ivspec = new IvParameterSpec(Arrays.copyOf(decryptedSymmetricKey, 16));
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
cipher.init(Cipher.DECRYPT_MODE, skey, ivspec);
String decryptedResourceData = new String(cipher.doFinal(Base64.decodeBase64(encryptedData)));