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Packages/com.tivadar.best.http/Runtime/3rdParty/BouncyCastle/crypto/paddings/ISO7816d4Padding.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.Crypto;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Security;
+
+namespace Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Paddings
+{
+	/**
+	 * A padder that adds the padding according to the scheme referenced in
+	 * ISO 7814-4 - scheme 2 from ISO 9797-1. The first byte is 0x80, rest is 0x00
+	 */
+	public class ISO7816d4Padding
+		: 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 padder implements.
+		 *
+		 * @return the name of the algorithm the padder implements.
+		 */
+		public string PaddingName
+		{
+			get { return "ISO7816-4"; }
+		}
+
+		public int AddPadding(byte[] input, int inOff)
+		{
+			int count = input.Length - inOff;
+
+			input[inOff]= 0x80;
+			while (++inOff < input.Length)
+			{
+				input[inOff] = 0x00;
+			}
+
+			return count;
+		}
+
+#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++] = 0x80;
+            block[position..].Fill(0x00);
+            return count;
+        }
+#endif
+
+        public int PadCount(byte[] input)
+		{
+			int position = -1, still00Mask = -1;
+			int i = input.Length;
+			while (--i >= 0)
+			{
+				int next = input[i];
+				int match00Mask = ((next ^ 0x00) - 1) >> 31;
+				int match80Mask = ((next ^ 0x80) - 1) >> 31;
+				position ^= (i ^ position) & still00Mask & match80Mask;
+				still00Mask &= match00Mask;
+			}
+			if (position < 0)
+				throw new InvalidCipherTextException("pad block corrupted");
+
+			return input.Length - position;
+		}
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
+        public int PadCount(ReadOnlySpan<byte> block)
+		{
+            int position = -1, still00Mask = -1;
+            int i = block.Length;
+            while (--i >= 0)
+            {
+                int next = block[i];
+                int match00Mask = ((next ^ 0x00) - 1) >> 31;
+                int match80Mask = ((next ^ 0x80) - 1) >> 31;
+                position ^= (i ^ position) & still00Mask & match80Mask;
+                still00Mask &= match00Mask;
+            }
+            if (position < 0)
+                throw new InvalidCipherTextException("pad block corrupted");
+
+            return block.Length - position;
+        }
+#endif
+    }
+}
+#pragma warning restore
+#endif