Add unit tests for RabbitMq and Udp transport servers and clients

- Implemented comprehensive unit tests for RabbitMqTransportServer, covering constructor, disposal, connection management, event handlers, and exception handling.
- Added configuration tests for RabbitMqTransportServer to validate SSL, durable queues, auto-recovery, and custom virtual host options.
- Created unit tests for UdpFrameProtocol, including frame parsing and serialization, header size validation, and round-trip data preservation.
- Developed tests for UdpTransportClient, focusing on connection handling, event subscriptions, and exception scenarios.
- Established tests for UdpTransportServer, ensuring proper start/stop behavior, connection state management, and event handling.
- Included tests for UdpTransportOptions to verify default values and modification capabilities.
- Enhanced service registration tests for Udp transport services in the dependency injection container.

src/Policy/StellaOps.Policy.RiskProfile/Export/ProfileExportService.cs

@@ -1,6 +1,7 @@
 using System.Security.Cryptography;
 using System.Text;
 using System.Text.Json;
+using StellaOps.Cryptography;
 using StellaOps.Policy.RiskProfile.Hashing;
 using StellaOps.Policy.RiskProfile.Lifecycle;
 using StellaOps.Policy.RiskProfile.Models;
@@ -17,6 +18,7 @@ public sealed class ProfileExportService
     private const string DefaultAlgorithm = "HMAC-SHA256";
 
     private readonly TimeProvider _timeProvider;
+    private readonly ICryptoHash _cryptoHash;
     private readonly RiskProfileHasher _hasher;
     private readonly Func<string, RiskProfileModel?>? _profileLookup;
     private readonly Func<string, RiskProfileVersionInfo?>? _lifecycleLookup;
@@ -30,14 +32,16 @@ public sealed class ProfileExportService
     };
 
     public ProfileExportService(
+        ICryptoHash cryptoHash,
         TimeProvider? timeProvider = null,
         Func<string, RiskProfileModel?>? profileLookup = null,
         Func<string, RiskProfileVersionInfo?>? lifecycleLookup = null,
         Action<RiskProfileModel>? profileSave = null,
         Func<string, string?>? keyLookup = null)
     {
+        _cryptoHash = cryptoHash ?? throw new ArgumentNullException(nameof(cryptoHash));
         _timeProvider = timeProvider ?? TimeProvider.System;
-        _hasher = new RiskProfileHasher();
+        _hasher = new RiskProfileHasher(cryptoHash);
         _profileLookup = profileLookup;
         _lifecycleLookup = lifecycleLookup;
         _profileSave = profileSave;
@@ -331,15 +335,14 @@ public sealed class ProfileExportService
             .ThenBy(p => p.Profile.Version)
             .Select(p => p.ContentHash));
 
-        var hashBytes = SHA256.HashData(Encoding.UTF8.GetBytes(combined));
-        return Convert.ToHexStringLower(hashBytes);
+        return _cryptoHash.ComputeHashHexForPurpose(Encoding.UTF8.GetBytes(combined), HashPurpose.Content);
     }
 
-    private static string GenerateBundleId(DateTimeOffset timestamp)
+    private string GenerateBundleId(DateTimeOffset timestamp)
     {
         var seed = $"{timestamp:O}|{Guid.NewGuid()}";
-        var hash = SHA256.HashData(Encoding.UTF8.GetBytes(seed));
-        return $"rpb-{Convert.ToHexStringLower(hash)[..16]}";
+        var hash = _cryptoHash.ComputeHashHexForPurpose(Encoding.UTF8.GetBytes(seed), HashPurpose.Content);
+        return $"rpb-{hash[..16]}";
     }
 
     private static string GetSourceVersion()

src/Policy/StellaOps.Policy.RiskProfile/Hashing/RiskProfileHasher.cs

@@ -1,7 +1,7 @@
-using System.Security.Cryptography;
 using System.Text;
 using System.Text.Json;
 using System.Text.Json.Serialization;
+using StellaOps.Cryptography;
 using StellaOps.Policy.RiskProfile.Models;
 
 namespace StellaOps.Policy.RiskProfile.Hashing;
@@ -11,6 +11,8 @@ namespace StellaOps.Policy.RiskProfile.Hashing;
 /// </summary>
 public sealed class RiskProfileHasher
 {
+    private readonly ICryptoHash _cryptoHash;
+
     private static readonly JsonSerializerOptions CanonicalJsonOptions = new()
     {
         WriteIndented = false,
@@ -22,20 +24,24 @@ public sealed class RiskProfileHasher
         },
     };
 
+    public RiskProfileHasher(ICryptoHash cryptoHash)
+    {
+        _cryptoHash = cryptoHash ?? throw new ArgumentNullException(nameof(cryptoHash));
+    }
+
     /// <summary>
-    /// Computes a deterministic SHA-256 hash of the risk profile.
+    /// Computes a deterministic hash of the risk profile using the compliance profile's content algorithm.
     /// </summary>
     /// <param name="profile">The profile to hash.</param>
-    /// <returns>Lowercase hex-encoded SHA-256 hash.</returns>
+    /// <returns>Lowercase hex-encoded hash.</returns>
     public string ComputeHash(RiskProfileModel profile)
     {
         ArgumentNullException.ThrowIfNull(profile);
 
         var canonical = CreateCanonicalForm(profile);
         var json = JsonSerializer.Serialize(canonical, CanonicalJsonOptions);
-        var hash = SHA256.HashData(Encoding.UTF8.GetBytes(json));
 
-        return Convert.ToHexStringLower(hash);
+        return _cryptoHash.ComputeHashHexForPurpose(Encoding.UTF8.GetBytes(json), HashPurpose.Content);
     }
 
     /// <summary>
@@ -43,16 +49,15 @@ public sealed class RiskProfileHasher
     /// Useful for detecting semantic changes regardless of versioning.
     /// </summary>
     /// <param name="profile">The profile to hash.</param>
-    /// <returns>Lowercase hex-encoded SHA-256 hash.</returns>
+    /// <returns>Lowercase hex-encoded hash.</returns>
     public string ComputeContentHash(RiskProfileModel profile)
     {
         ArgumentNullException.ThrowIfNull(profile);
 
         var canonical = CreateCanonicalContentForm(profile);
         var json = JsonSerializer.Serialize(canonical, CanonicalJsonOptions);
-        var hash = SHA256.HashData(Encoding.UTF8.GetBytes(json));
 
-        return Convert.ToHexStringLower(hash);
+        return _cryptoHash.ComputeHashHexForPurpose(Encoding.UTF8.GetBytes(json), HashPurpose.Content);
     }
 
     /// <summary>

src/Policy/StellaOps.Policy.RiskProfile/Lifecycle/RiskProfileLifecycleService.cs

@@ -1,6 +1,5 @@
 using System.Collections.Concurrent;
-using System.Security.Cryptography;
-using System.Text;
+using StellaOps.Cryptography;
 using StellaOps.Policy.RiskProfile.Hashing;
 using StellaOps.Policy.RiskProfile.Models;
 
@@ -16,10 +15,11 @@ public sealed class RiskProfileLifecycleService
     private readonly ConcurrentDictionary<string, List<RiskProfileVersionInfo>> _versions;
     private readonly ConcurrentDictionary<string, List<RiskProfileLifecycleEvent>> _events;
 
-    public RiskProfileLifecycleService(TimeProvider? timeProvider = null)
+    public RiskProfileLifecycleService(ICryptoHash cryptoHash, TimeProvider? timeProvider = null)
     {
+        ArgumentNullException.ThrowIfNull(cryptoHash);
         _timeProvider = timeProvider ?? TimeProvider.System;
-        _hasher = new RiskProfileHasher();
+        _hasher = new RiskProfileHasher(cryptoHash);
         _versions = new ConcurrentDictionary<string, List<RiskProfileVersionInfo>>(StringComparer.OrdinalIgnoreCase);
         _events = new ConcurrentDictionary<string, List<RiskProfileLifecycleEvent>>(StringComparer.OrdinalIgnoreCase);
     }

src/Policy/StellaOps.Policy.RiskProfile/StellaOps.Policy.RiskProfile.csproj

@@ -11,6 +11,10 @@
     <PackageReference Include="JsonSchema.Net" Version="5.3.0" />
   </ItemGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="../../__Libraries/StellaOps.Cryptography/StellaOps.Cryptography.csproj" />
+  </ItemGroup>
+
   <ItemGroup>
     <EmbeddedResource Include="Schemas\risk-profile-schema@1.json" />
   </ItemGroup>