1 files changed, 46 insertions, 0 deletions
diff --git a/crypto/src/bcpg/Crc24.cs b/crypto/src/bcpg/Crc24.cs
new file mode 100644
index 000000000..97846f4fb
--- /dev/null
+++ b/crypto/src/bcpg/Crc24.cs
@@ -0,0 +1,46 @@
+using System;
+
+namespace Org.BouncyCastle.Bcpg
+{
+    public class Crc24
+    {
+        private const int Crc24Init = 0x0b704ce;
+        private const int Crc24Poly = 0x1864cfb;
+
+        private int crc = Crc24Init;
+
+        public Crc24()
+        {
+        }
+
+        public void Update(
+            int b)
+        {
+            crc ^= b << 16;
+            for (int i = 0; i < 8; i++)
+            {
+                crc <<= 1;
+                if ((crc & 0x1000000) != 0)
+                {
+                    crc ^= Crc24Poly;
+                }
+            }
+        }
+
+		[Obsolete("Use 'Value' property instead")]
+        public int GetValue()
+        {
+            return crc;
+        }
+
+		public int Value
+		{
+			get { return crc; }
+		}
+
+		public void Reset()
+        {
+            crc = Crc24Init;
+        }
+    }
+}