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Packages/com.tivadar.best.http/Runtime/3rdParty/BouncyCastle/crypto/paddings/ZeroBytePadding.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 Null byte padding to a block.</summary>
+    public class ZeroBytePadding : 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 "ZeroBytePadding"; }
+        }
+
+		/// <summary> Initialise the padder.
+        ///
+        /// </summary>
+        /// <param name="random">- a SecureRandom if available.
+        /// </param>
+        public void Init(SecureRandom random)
+        {
+            // nothing to do.
+        }
+
+        public int AddPadding(byte[] input, int inOff)
+        {
+            int added = input.Length - inOff;
+
+            while (inOff < input.Length)
+            {
+                input[inOff++] = 0x00;
+            }
+
+            return added;
+        }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
+        public int AddPadding(Span<byte> block, int position)
+        {
+            int count = block.Length - position;
+            block[position..].Fill(0x00);
+            return count;
+        }
+#endif
+
+        public int PadCount(byte[] input)
+        {
+            int count = 0, still00Mask = -1;
+            int i = input.Length;
+            while (--i >= 0)
+            {
+                int next = input[i];
+                int match00Mask = ((next ^ 0x00) - 1) >> 31;
+                still00Mask &= match00Mask;
+                count -= still00Mask;
+            }
+            return count;
+        }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
+        public int PadCount(ReadOnlySpan<byte> block)
+        {
+            int count = 0, still00Mask = -1;
+            int i = block.Length;
+            while (--i >= 0)
+            {
+                int next = block[i];
+                int match00Mask = ((next ^ 0x00) - 1) >> 31;
+                still00Mask &= match00Mask;
+                count -= still00Mask;
+            }
+            return count;
+        }
+#endif
+    }
+}
+#pragma warning restore
+#endif