Adds Argon2 for password protection (#123)

Projects/Argon2/Argon2Error.cs

@@ -0,0 +1,77 @@
+namespace Server.Accounting.Security
+{
+  /// <summary>
+  /// An enumeration of the possible error codes which are returned from Daniel Dinu and
+  /// Dmitry Khovratovich's Argon2 library.
+  ///
+  /// Some of these error conditions cannot be reached while using the C# PasswordHasher wrapper
+  /// </summary>
+  public enum Argon2Error
+  {
+    /// <summary>
+    /// The operation was successful
+    /// </summary>
+    OK = 0,
+
+    /// <summary>
+    /// The output hash length is less than 4 bytes
+    /// </summary>
+    OUTPUT_TOO_SHORT = -2,
+
+    /// <summary>
+    /// The salt is less than 8 bytes
+    /// </summary>
+    SALT_TOO_SHORT = -6,
+
+    /// <summary>
+    /// The time cost is less than 1
+    /// </summary>
+    TIME_TOO_SMALL = -12,
+
+    /// <summary>
+    /// The memory cost is less than 8 (KiB)
+    /// </summary>
+    MEMORY_TOO_LITTLE = -14,
+    /// <summary>
+    /// The memory cost is greater than 2^21 (KiB) (2 GiB)
+    /// </summary>
+    MEMORY_TOO_MUCH = -15,
+
+    /// <summary>
+    /// The parallelism is less than 1
+    /// </summary>
+    LANES_TOO_FEW = -16,
+    /// <summary>
+    /// The parallelism is greater than 16,777,215
+    /// </summary>
+    LANES_TOO_MANY = -17,
+
+    /// <summary>
+    /// Memory allocation failed
+    /// </summary>
+    MEMORY_ALLOCATION_ERROR = -22,
+
+    /// <summary>
+    /// The parallelism is less than 1
+    /// </summary>
+    THREADS_TOO_FEW = -28,
+    /// <summary>
+    /// The parallelism is greater than 16,777,215
+    /// </summary>
+    THREADS_TOO_MANY = -29,
+
+    /// <summary>
+    /// This will not be returned from the C# PasswordHasher wrapper
+    /// </summary>
+    DECODING_FAIL = -32,
+    /// <summary>
+    /// Unable to create the number of threads requested
+    /// </summary>
+    THREAD_FAIL = -33,
+
+    /// <summary>
+    /// This will not be returned from the C# PasswordHasher wrapper
+    /// </summary>
+    VERIFY_MISMATCH = -35
+  }
+}