81 lines
2.4 KiB
C#
81 lines
2.4 KiB
C#
#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 System.Security.Cryptography;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Prng
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{
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public class CryptoApiEntropySourceProvider
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: IEntropySourceProvider
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{
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private readonly RandomNumberGenerator mRng;
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private readonly bool mPredictionResistant;
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public CryptoApiEntropySourceProvider()
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: this(RandomNumberGenerator.Create(), true)
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{
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}
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public CryptoApiEntropySourceProvider(RandomNumberGenerator rng, bool isPredictionResistant)
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{
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if (rng == null)
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throw new ArgumentNullException("rng");
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mRng = rng;
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mPredictionResistant = isPredictionResistant;
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}
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public IEntropySource Get(int bitsRequired)
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{
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return new CryptoApiEntropySource(mRng, mPredictionResistant, bitsRequired);
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}
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private class CryptoApiEntropySource
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: IEntropySource
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{
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private readonly RandomNumberGenerator mRng;
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private readonly bool mPredictionResistant;
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private readonly int mEntropySize;
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internal CryptoApiEntropySource(RandomNumberGenerator rng, bool predictionResistant, int entropySize)
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{
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this.mRng = rng;
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this.mPredictionResistant = predictionResistant;
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this.mEntropySize = entropySize;
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}
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#region IEntropySource Members
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bool IEntropySource.IsPredictionResistant
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{
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get { return mPredictionResistant; }
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}
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byte[] IEntropySource.GetEntropy()
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{
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byte[] result = new byte[(mEntropySize + 7) / 8];
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mRng.GetBytes(result);
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return result;
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}
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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || _UNITY_2021_2_OR_NEWER_
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int IEntropySource.GetEntropy(Span<byte> output)
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{
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int length = (mEntropySize + 7) / 8;
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mRng.GetBytes(output[..length]);
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return length;
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}
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#endif
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int IEntropySource.EntropySize
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{
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get { return mEntropySize; }
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}
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#endregion
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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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