feat: hashing utils

Dalamud/Utility/Hash.cs

@@ -0,0 +1,34 @@
+using System;
+
+namespace Dalamud.Utility
+{
+    /// <summary>
+    /// Utility functions for hashing.
+    /// </summary>
+    public static class Hash
+    {
+        /// <summary>
+        /// Get the SHA-256 hash of a string.
+        /// </summary>
+        /// <param name="text">The string to hash.</param>
+        /// <returns>The computed hash.</returns>
+        internal static string GetStringSha256Hash(string text)
+        {
+            return string.IsNullOrEmpty(text) ? string.Empty : GetSha256Hash(System.Text.Encoding.UTF8.GetBytes(text));
+        }
+
+        /// <summary>
+        /// Get the SHA-256 hash of a byte array.
+        /// </summary>
+        /// <param name="buffer">The byte array to hash.</param>
+        /// <returns>The computed hash.</returns>
+        internal static string GetSha256Hash(byte[] buffer)
+        {
+            using var sha = new System.Security.Cryptography.SHA256Managed();
+            var hash = sha.ComputeHash(buffer);
+            return ByteArrayToString(hash);
+        }
+
+        private static string ByteArrayToString(byte[] ba) => BitConverter.ToString(ba).Replace("-", string.Empty);
+    }
+}