up

Assets/BestHTTP/SecureProtocol/crypto/paddings/Pkcs7Padding.cs

@@ -0,0 +1,80 @@
+#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
+
+using System;
+
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Security;
+
+namespace Org.BouncyCastle.Crypto.Paddings
+{
+    /**
+    * A padder that adds Pkcs7/Pkcs5 padding to a block.
+    */
+    public class Pkcs7Padding
+        : IBlockCipherPadding
+    {
+        /**
+        * Initialise the padder.
+        *
+        * @param random - a SecureRandom if available.
+        */
+        public void Init(
+            SecureRandom random)
+        {
+            // nothing to do.
+        }
+
+        /**
+        * Return the name of the algorithm the cipher implements.
+        *
+        * @return the name of the algorithm the cipher implements.
+        */
+        public string PaddingName
+        {
+            get { return "PKCS7"; }
+        }
+
+        /**
+        * add the pad bytes to the passed in block, returning the
+        * number of bytes added.
+        */
+        public int AddPadding(
+            byte[]  input,
+            int     inOff)
+        {
+            byte code = (byte)(input.Length - inOff);
+
+            while (inOff < input.Length)
+            {
+                input[inOff] = code;
+                inOff++;
+            }
+
+            return code;
+        }
+
+        /**
+        * return the number of pad bytes present in the block.
+        */
+        public int PadCount(
+            byte[] input)
+        {
+            byte countAsByte = input[input.Length - 1];
+            int count = countAsByte;
+
+            if (count < 1 || count > input.Length)
+                throw new InvalidCipherTextException("pad block corrupted");
+
+            for (int i = 2; i <= count; i++)
+            {
+                if (input[input.Length - i] != countAsByte)
+                    throw new InvalidCipherTextException("pad block corrupted");
+            }
+
+            return count;
+        }
+    }
+
+}
+
+#endif