Add option to consolidate duplicate ATA entities.

DiscImageChef.Server/Core/Hash.cs

@@ -0,0 +1,36 @@
+using System.Security.Cryptography;
+
+namespace DiscImageChef.Server
+{
+    public static class Hash
+    {
+        public static string Sha512(byte[] data)
+        {
+            byte[] hash;
+
+            using(var sha = new SHA512Managed())
+            {
+                sha.Initialize();
+                hash = sha.ComputeHash(data);
+            }
+
+            char[] chars = new char[hash.Length * 2];
+
+            int j = 0;
+
+            foreach(byte b in hash)
+            {
+                int nibble1 = (b & 0xF0) >> 4;
+                int nibble2 = b & 0x0F;
+
+                nibble1 += nibble1 > 9 ? 0x57 : 0x30;
+                nibble2 += nibble2 > 9 ? 0x57 : 0x30;
+
+                chars[j++] = (char)nibble1;
+                chars[j++] = (char)nibble2;
+            }
+
+            return new string(chars);
+        }
+    }
+}