Hash IP addresses

src/main/java/me/braydon/license/model/License.java

@@ -7,6 +7,7 @@ import lombok.ToString;
 import me.braydon.license.exception.APIException;
 import me.braydon.license.exception.LicenseHwidLimitExceededException;
 import me.braydon.license.exception.LicenseIpLimitExceededException;
+import org.mindrot.jbcrypt.BCrypt;
 import org.springframework.data.annotation.Id;
 import org.springframework.data.mongodb.core.mapping.Document;
 
@@ -45,9 +46,6 @@ public class License {
     
     /**
      * The IPs used on this license.
-     * <p>
-     * These IPs are encrypted using AES-256.
-     * </p>
      */
     private Set<String> ips;
     
@@ -80,18 +78,23 @@ public class License {
      * Invoked when this license is used.
      *
      * @param ip     the ip used
+     * @param ipSalt the IP salt to use
      * @param hwid   the hardware id used
      */
-    public void use(@NonNull String ip, @NonNull String hwid) throws APIException {
-        if (!ips.contains(ip) && ips.size() >= ipLimit) { // IP limit has been exceeded
+    public void use(@NonNull String ip, @NonNull String ipSalt, @NonNull String hwid) throws APIException {
+        String hashedIp = BCrypt.hashpw(ip, ipSalt); // Hash the IP
+        
+        // IP limit has been exceeded
+        if (!ips.contains(hashedIp) && ips.size() >= ipLimit) {
             throw new LicenseIpLimitExceededException();
         }
-        if (!hwids.contains(hwid) && hwids.size() >= hwidLimit) { // HWID limit has been exceeded
+        // HWID limit has been exceeded
+        if (!hwids.contains(hwid) && hwids.size() >= hwidLimit) {
             throw new LicenseHwidLimitExceededException();
         }
         // The license was used
         uses++; // Increment uses
-        ips.add(ip); // Add the used IP
+        ips.add(hashedIp); // Add the used IP
         hwids.add(hwid); // Add the used HWID
         lastUsed = new Date(); // Last used now
     }

src/main/java/me/braydon/license/service/LicenseService.java

@@ -3,7 +3,6 @@ package me.braydon.license.service;
 import jakarta.annotation.PostConstruct;
 import lombok.NonNull;
 import lombok.extern.slf4j.Slf4j;
-import me.braydon.license.common.RandomUtils;
 import me.braydon.license.exception.APIException;
 import me.braydon.license.exception.LicenseNotFoundException;
 import me.braydon.license.model.License;
@@ -33,8 +32,14 @@ public final class LicenseService {
     /**
      * The salt to use for hashing license keys.
      */
-    @Value("${key-salt}")
-    @NonNull private String keySalt;
+    @Value("${salts.licenses}")
+    @NonNull private String licensesSalt;
+    
+    /**
+     * The salt to use for hashing IP addresses.
+     */
+    @Value("${salts.ips}")
+    @NonNull private String ipsSalt;
     
     @Autowired
     public LicenseService(@NonNull LicenseRepository repository) {
@@ -68,7 +73,7 @@ public final class LicenseService {
                           String description, int ipLimit, int hwidLimit) {
         // Create the new license
         License license = new License();
-        license.setKey(BCrypt.hashpw(key, keySalt)); // Hash the key
+        license.setKey(BCrypt.hashpw(key, licensesSalt)); // Hash the key
         license.setProduct(product); // Use the given product
         license.setDescription(description); // Use the given description, if any
         license.setIps(new HashSet<>());
@@ -92,13 +97,13 @@ public final class LicenseService {
      */
     public void check(@NonNull String key, @NonNull String product,
                       @NonNull String ip, @NonNull String hwid) throws APIException {
-        Optional<License> optionalLicense = repository.getLicense(BCrypt.hashpw(key, keySalt), product); // Get the license
+        Optional<License> optionalLicense = repository.getLicense(BCrypt.hashpw(key, licensesSalt), product); // Get the license
         if (optionalLicense.isEmpty()) { // License key not found
             log.error("License key {} for product {} not found", key, product); // Log the error
             throw new LicenseNotFoundException();
         }
         License license = optionalLicense.get(); // The license found
-        license.use(ip, hwid); // Use the license
+        license.use(ip, ipsSalt, hwid); // Use the license
         repository.save(license); // Save the used license
         log.info("License key {} for product {} was used by {} ({})", key, product, ip, hwid);
     }

src/main/resources/application.yml

@@ -3,9 +3,11 @@ server:
   address: 0.0.0.0
   port: 7500
 
-# The salt to use when hashing license keys.
-# This salt should be changed from the default.
-key-salt: "$2a$10$/nQyzQDMkCf97ZlJLLWa3O"
+# The salt to use when hashing license keys and IP addresses.
+# These salts should be changed from the default.
+salts:
+  licenses: "$2a$10$/nQyzQDMkCf97ZlJLLWa3O"
+  ips: "$2a$10$Xus.AHTCas97Ofx0tFs85O"
 
 # Log Configuration
 logging: