Add UpdateAccountCryptographicState repository function (#6669)

* Add user repository update function for account cryptographic state

* Remove comment

* Remove transaction logic

* Fix security version

* Apply feedback

* Update tests

* Add support for external actions

src/Core/KeyManagement/Models/Data/UserAccountKeysData.cs

@@ -1,9 +1,34 @@
 namespace Bit.Core.KeyManagement.Models.Data;
 
-
+/// <summary>
+/// Represents an expanded account cryptographic state for a user. Expanded here means
+/// that it does not only contain the (wrapped) private / signing key, but also the public
+/// key / verifying key. The client side only needs a subset of this data to unlock
+/// their vault and the public parts can be derived.
+/// </summary>
 public class UserAccountKeysData
 {
     public required PublicKeyEncryptionKeyPairData PublicKeyEncryptionKeyPairData { get; set; }
     public SignatureKeyPairData? SignatureKeyPairData { get; set; }
     public SecurityStateData? SecurityStateData { get; set; }
+
+    /// <summary>
+    /// Checks whether the account cryptographic state is for a V1 encryption user or a V2 encryption user.
+    /// Throws if the state is invalid
+    /// </summary>
+    public bool IsV2Encryption()
+    {
+        if (PublicKeyEncryptionKeyPairData.SignedPublicKey != null && SignatureKeyPairData != null && SecurityStateData != null)
+        {
+            return true;
+        }
+        else if (PublicKeyEncryptionKeyPairData.SignedPublicKey == null && SignatureKeyPairData == null && SecurityStateData == null)
+        {
+            return false;
+        }
+        else
+        {
+            throw new InvalidOperationException("Invalid account cryptographic state: V2 encryption fields must be either all present or all absent.");
+        }
+    }
 }