78 lines
2.6 KiB
C#
78 lines
2.6 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 Best.HTTP.SecureProtocol.Org.BouncyCastle.Asn1;
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using Best.HTTP.SecureProtocol.Org.BouncyCastle.Asn1.X509;
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using Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Generators;
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using Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Parameters;
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using Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Utilities;
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namespace Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Agreement.Kdf
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{
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/**
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* X9.63 based key derivation function for ECDH CMS.
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*/
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public sealed class ECDHKekGenerator
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: IDerivationFunction
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{
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private readonly IDerivationFunction m_kdf;
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private DerObjectIdentifier algorithm;
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private int keySize;
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private byte[] z;
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public ECDHKekGenerator(IDigest digest)
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{
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m_kdf = new Kdf2BytesGenerator(digest);
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}
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public void Init(IDerivationParameters param)
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{
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DHKdfParameters parameters = (DHKdfParameters)param;
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this.algorithm = parameters.Algorithm;
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this.keySize = parameters.KeySize;
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this.z = parameters.GetZ(); // TODO Clone?
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}
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public IDigest Digest => m_kdf.Digest;
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public int GenerateBytes(byte[] outBytes, int outOff, int length)
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{
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Check.OutputLength(outBytes, outOff, length, "output buffer too small");
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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
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return GenerateBytes(outBytes.AsSpan(outOff, length));
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#else
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// TODO Create an ASN.1 class for this (RFC3278)
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// ECC-CMS-SharedInfo
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DerSequence s = new DerSequence(
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new AlgorithmIdentifier(algorithm, DerNull.Instance),
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new DerTaggedObject(true, 2, new DerOctetString(Pack.UInt32_To_BE((uint)keySize))));
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m_kdf.Init(new KdfParameters(z, s.GetDerEncoded()));
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return m_kdf.GenerateBytes(outBytes, outOff, length);
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#endif
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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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public int GenerateBytes(Span<byte> output)
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{
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// TODO Create an ASN.1 class for this (RFC3278)
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// ECC-CMS-SharedInfo
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DerSequence s = new DerSequence(
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new AlgorithmIdentifier(algorithm, DerNull.Instance),
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new DerTaggedObject(true, 2, new DerOctetString(Pack.UInt32_To_BE((uint)keySize))));
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m_kdf.Init(new KdfParameters(z, s.GetDerEncoded()));
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return m_kdf.GenerateBytes(output);
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}
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#endif
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}
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}
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#pragma warning restore
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#endif
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