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Packages/com.tivadar.best.http/Runtime/3rdParty/BouncyCastle/crypto/paddings/TbcPadding.cs

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+#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
+#pragma warning disable
+using System;
+
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Security;
+
+namespace Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Paddings
+{
+
+    /// <summary> A padder that adds Trailing-Bit-Compliment padding to a block.
+    /// <p>
+    /// This padding pads the block out compliment of the last bit
+    /// of the plain text.
+    /// </p>
+    /// </summary>
+    public class TbcPadding
+		: IBlockCipherPadding
+    {
+        /// <summary> Return the name of the algorithm the cipher implements.</summary>
+        /// <returns> the name of the algorithm the cipher implements.
+        /// </returns>
+        public string PaddingName
+        {
+            get { return "TBC"; }
+        }
+
+		/// <summary> Initialise the padder.</summary>
+        /// <param name="random">- a SecureRandom if available.
+        /// </param>
+        public virtual void Init(SecureRandom random)
+        {
+            // nothing to do.
+        }
+
+        /// <summary> add the pad bytes to the passed in block, returning the number of bytes added.</summary>
+        /// <remarks>
+        /// This assumes that the last block of plain text is always passed to it inside <paramref name="input"/>.
+        /// i.e. if <paramref name="inOff"/> is zero, indicating the padding will fill the entire block,the value of
+        /// <paramref name="input"/> should be the same as the last block of plain text.
+        /// </remarks>
+        public virtual int AddPadding(byte[] input, int inOff)
+        {
+            int count = input.Length - inOff;
+            byte lastByte = inOff > 0 ? input[inOff - 1] : input[input.Length - 1];
+            byte padValue = (byte)((lastByte & 1) - 1);
+
+            while (inOff < input.Length)
+            {
+                input[inOff++] = padValue;
+            }
+
+            return count;
+        }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
+        /// <summary> add the pad bytes to the passed in block, returning the number of bytes added.</summary>
+        /// <remarks>
+        /// This assumes that the last block of plain text is always passed to it inside <paramref name="block"/>.
+        /// i.e. if <paramref name="position"/> is zero, indicating the padding will fill the entire block,the value of
+        /// <paramref name="block"/> should be the same as the last block of plain text.
+        /// </remarks>
+        public virtual int AddPadding(Span<byte> block, int position)
+        {
+            byte lastByte = position > 0 ? block[position - 1] : block[block.Length - 1];
+            byte padValue = (byte)((lastByte & 1) - 1);
+
+            var padding = block[position..];
+            padding.Fill(padValue);
+            return padding.Length;
+        }
+#endif
+
+        public virtual int PadCount(byte[] input)
+        {
+            int i = input.Length;
+            int code = input[--i], count = 1, countingMask = -1;
+            while (--i >= 0)
+            {
+                int next = input[i];
+                int matchMask = ((next ^ code) - 1) >> 31;
+                countingMask &= matchMask;
+                count -= countingMask;
+            }
+            return count;
+        }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
+        public virtual int PadCount(ReadOnlySpan<byte> block)
+        {
+            int i = block.Length;
+            int code = block[--i], count = 1, countingMask = -1;
+            while (--i >= 0)
+            {
+                int next = block[i];
+                int matchMask = ((next ^ code) - 1) >> 31;
+                countingMask &= matchMask;
+                count -= countingMask;
+            }
+            return count;
+        }
+#endif
+    }
+}
+#pragma warning restore
+#endif