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Packages/com.tivadar.best.http/Runtime/3rdParty/BouncyCastle/crypto/fpe/FpeFf1Engine.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.Parameters;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Utilities;
+
+namespace Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Fpe
+{
+    public class FpeFf1Engine
+        : FpeEngine
+    {
+        public FpeFf1Engine()
+            : this(AesUtilities.CreateEngine())
+        {
+        }
+
+        public FpeFf1Engine(IBlockCipher baseCipher)
+            : base(baseCipher)
+        {
+            if (IsOverrideSet(SP80038G.FPE_DISABLED) ||
+                IsOverrideSet(SP80038G.FF1_DISABLED))
+            {
+                throw new InvalidOperationException("FF1 encryption disabled");
+            }
+        }
+
+        public override void Init(bool forEncryption, ICipherParameters parameters)
+        {
+            this.forEncryption = forEncryption;
+            this.fpeParameters = (FpeParameters)parameters;
+
+            baseCipher.Init(!fpeParameters.UseInverseFunction, fpeParameters.Key);
+        }
+
+        protected override int EncryptBlock(byte[] inBuf, int inOff, int length, byte[] outBuf, int outOff)
+        {
+            byte[] enc;
+
+            if (fpeParameters.Radix > 256)
+            {
+                if ((length & 1) != 0)
+                    throw new ArgumentException("input must be an even number of bytes for a wide radix");
+
+                ushort[] u16In = Pack.BE_To_UInt16(inBuf, inOff, length);
+                ushort[] u16Out = SP80038G.EncryptFF1w(baseCipher, fpeParameters.Radix, fpeParameters.GetTweak(),
+                    u16In, 0, u16In.Length);
+                enc = Pack.UInt16_To_BE(u16Out, 0, u16Out.Length);
+            }
+            else
+            {
+                enc = SP80038G.EncryptFF1(baseCipher, fpeParameters.Radix, fpeParameters.GetTweak(), inBuf, inOff, length);
+            }
+
+            Array.Copy(enc, 0, outBuf, outOff, length);
+
+            return length;
+        }
+
+        protected override int DecryptBlock(byte[] inBuf, int inOff, int length, byte[] outBuf, int outOff)
+        {
+            byte[] dec;
+
+            if (fpeParameters.Radix > 256)
+            {
+                if ((length & 1) != 0)
+                    throw new ArgumentException("input must be an even number of bytes for a wide radix");
+
+                ushort[] u16In = Pack.BE_To_UInt16(inBuf, inOff, length);
+                ushort[] u16Out = SP80038G.DecryptFF1w(baseCipher, fpeParameters.Radix, fpeParameters.GetTweak(),
+                    u16In, 0, u16In.Length);
+                dec = Pack.UInt16_To_BE(u16Out, 0, u16Out.Length);
+            }
+            else
+            {
+                dec = SP80038G.DecryptFF1(baseCipher, fpeParameters.Radix, fpeParameters.GetTweak(), inBuf, inOff, length);
+            }
+
+            Array.Copy(dec, 0, outBuf, outOff, length);
+
+            return length;
+        }
+    }
+}
+#pragma warning restore
+#endif