Added decrypt auth identity.

Author: tyranid

NtApiDotNet/Win32/Security/Credential/AuthIdentity/SecWinNtAuthIdentity.cs

@@ -239,6 +239,17 @@ public ILsaLogonCredentials ToLsaLogonCredentials(string package = Authenticatio
             return new SecWinNtAuthIdentityLsaLogonCredentials(package, ToArray());
         }
 
+        /// <summary>
+        /// Decrypt the credentials if encrypted.
+        /// </summary>
+        /// <param name="encrypt_options">The decryption options.</param>
+        public void Decrypt(SecWinNtAuthIdentityEncryptionOptions encrypt_options = 0)
+        {
+            if (!IsEncrypted)
+                return;
+            SecurityNativeMethods.SspiDecryptAuthIdentityEx(encrypt_options, _auth_id).CheckResult();
+        }
+
         /// <summary>
         /// Convert the object to a string.
         /// </summary>

NtApiDotNet/Win32/Security/Native/SecurityNativeMethods.cs

@@ -251,22 +251,12 @@ internal static extern bool SspiIsAuthIdentityEncrypted(
             SafeSecWinNtAuthIdentityBuffer EncryptedAuthData
         );
 
-        [DllImport("sspicli.dll", CharSet = CharSet.Unicode)]
-        internal static extern SecStatusCode SspiDecryptAuthIdentity(
-            SafeBuffer EncryptedAuthData
-        );
-
         [DllImport("sspicli.dll", CharSet = CharSet.Unicode)]
         internal static extern SecStatusCode SspiDecryptAuthIdentityEx(
             SecWinNtAuthIdentityEncryptionOptions Options,
             SafeBuffer EncryptedAuthData
         );
 
-        [DllImport("sspicli.dll", CharSet = CharSet.Unicode)]
-        internal static extern SecStatusCode SspiEncryptAuthIdentity(
-            SafeBuffer AuthData
-        );
-
         [DllImport("sspicli.dll", CharSet = CharSet.Unicode)]
         internal static extern SecStatusCode SspiEncryptAuthIdentityEx(
             SecWinNtAuthIdentityEncryptionOptions Options,