1 files changed, 37 insertions, 0 deletions
diff --git a/pg/src/main/java/org/spongycastle/bcpg/CRC24.java b/pg/src/main/java/org/spongycastle/bcpg/CRC24.java
new file mode 100644
index 00000000..b9db421d
--- /dev/null
+++ b/pg/src/main/java/org/spongycastle/bcpg/CRC24.java
@@ -0,0 +1,37 @@
+package org.spongycastle.bcpg;
+
+public class CRC24
+{
+    private static final int CRC24_INIT = 0x0b704ce;
+    private static final int CRC24_POLY = 0x1864cfb;
+                                                                                
+    private int crc = CRC24_INIT;
+                                                                                
+    public CRC24()
+    {
+    }
+
+    public void update(
+        int b)
+    {
+        crc ^= b << 16;
+        for (int i = 0; i < 8; i++)
+        {
+            crc <<= 1;
+            if ((crc & 0x1000000) != 0)
+            {
+                crc ^= CRC24_POLY;
+            }
+        }
+    }
+
+    public int getValue()
+    {
+        return crc;
+    }
+
+    public void reset()
+    {
+        crc = CRC24_INIT;
+    }
+}