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91 lines
3.1 KiB
91 lines
3.1 KiB
1 year ago
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#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Parameters;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Engines;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Utilities;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Fpe
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{
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public class FpeFf3_1Engine
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: FpeEngine
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{
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public FpeFf3_1Engine()
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: this(new AesEngine())
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{
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}
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public FpeFf3_1Engine(IBlockCipher baseCipher)
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: base(baseCipher)
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{
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if (IsOverrideSet(SP80038G.FPE_DISABLED))
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{
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throw new InvalidOperationException("FPE disabled");
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}
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}
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public override void Init(bool forEncryption, ICipherParameters parameters)
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{
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this.forEncryption = forEncryption;
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this.fpeParameters = (FpeParameters)parameters;
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baseCipher.Init(!fpeParameters.UseInverseFunction, new KeyParameter(Arrays.Reverse(fpeParameters.Key.GetKey())));
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if (fpeParameters.GetTweak().Length != 7)
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throw new ArgumentException("tweak should be 56 bits");
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}
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protected override int EncryptBlock(byte[] inBuf, int inOff, int length, byte[] outBuf, int outOff)
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{
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byte[] enc;
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if (fpeParameters.Radix > 256)
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{
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if ((length & 1) != 0)
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throw new ArgumentException("input must be an even number of bytes for a wide radix");
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ushort[] u16In = Pack.BE_To_UInt16(inBuf, inOff, length);
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ushort[] u16Out = SP80038G.EncryptFF3_1w(baseCipher, fpeParameters.Radix, fpeParameters.GetTweak(),
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u16In, 0, u16In.Length);
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enc = Pack.UInt16_To_BE(u16Out, 0, u16Out.Length);
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}
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else
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{
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enc = SP80038G.EncryptFF3_1(baseCipher, fpeParameters.Radix, fpeParameters.GetTweak(), inBuf, inOff, length);
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}
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Array.Copy(enc, 0, outBuf, outOff, length);
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return length;
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}
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protected override int DecryptBlock(byte[] inBuf, int inOff, int length, byte[] outBuf, int outOff)
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{
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byte[] dec;
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if (fpeParameters.Radix > 256)
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{
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if ((length & 1) != 0)
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throw new ArgumentException("input must be an even number of bytes for a wide radix");
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ushort[] u16In = Pack.BE_To_UInt16(inBuf, inOff, length);
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ushort[] u16Out = SP80038G.DecryptFF3_1w(baseCipher, fpeParameters.Radix, fpeParameters.GetTweak(),
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u16In, 0, u16In.Length);
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dec = Pack.UInt16_To_BE(u16Out, 0, u16Out.Length);
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}
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else
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{
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dec = SP80038G.DecryptFF3_1(baseCipher, fpeParameters.Radix, fpeParameters.GetTweak(), inBuf, inOff, length);
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}
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Array.Copy(dec, 0, outBuf, outOff, length);
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return length;
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}
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}
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}
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#pragma warning restore
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#endif
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