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78 lines
3.1 KiB
78 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.Utilities;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Fpe
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{
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/// <summary>Base class for format-preserving encryption.</summary>
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public abstract class FpeEngine
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{
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protected readonly IBlockCipher baseCipher;
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protected bool forEncryption;
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protected FpeParameters fpeParameters;
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protected FpeEngine(IBlockCipher baseCipher)
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{
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this.baseCipher = baseCipher;
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}
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/// <summary>
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/// Process length bytes from inBuf, writing the output to outBuf.
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/// </summary>
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/// <returns>number of bytes output.</returns>
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/// <param name="inBuf">input data.</param>
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/// <param name="inOff">offset in input data to start at.</param>
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/// <param name="length">number of bytes to process.</param>
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/// <param name="outBuf">destination buffer.</param>
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/// <param name="outOff">offset to start writing at in destination buffer.</param>
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public virtual int ProcessBlock(byte[] inBuf, int inOff, int length, byte[] outBuf, int outOff)
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{
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if (fpeParameters == null)
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throw new InvalidOperationException("FPE engine not initialized");
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if (length < 0)
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throw new ArgumentException("cannot be negative", "length");
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if (inBuf == null)
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throw new ArgumentNullException("inBuf");
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if (outBuf == null)
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throw new ArgumentNullException("outBuf");
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Check.DataLength(inBuf, inOff, length, "input buffer too short");
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Check.OutputLength(outBuf, outOff, length, "output buffer too short");
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if (forEncryption)
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{
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return EncryptBlock(inBuf, inOff, length, outBuf, outOff);
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}
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else
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{
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return DecryptBlock(inBuf, inOff, length, outBuf, outOff);
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}
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}
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protected static bool IsOverrideSet(string propName)
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{
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string propValue = BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities.Platform.GetEnvironmentVariable(propName);
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return propValue != null && BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities.Platform.EqualsIgnoreCase("true", propValue);
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}
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/// <summary>
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/// Initialize the FPE engine for encryption/decryption.
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/// </summary>
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/// <returns>number of bytes output.</returns>
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/// <param name="forEncryption">true if initialising for encryption, false otherwise.</param>
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/// <param name="parameters ">the key and other parameters to use to set the engine up.</param>
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public abstract void Init(bool forEncryption, ICipherParameters parameters);
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protected abstract int EncryptBlock(byte[] inBuf, int inOff, int length, byte[] outBuf, int outOff);
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protected abstract int DecryptBlock(byte[] inBuf, int inOff, int length, byte[] outBuf, int outOff);
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}
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}
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#pragma warning restore
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#endif
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