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68 lines
1.9 KiB
68 lines
1.9 KiB
8 months 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 System.Collections;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.Nist;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.Pkcs;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.X9;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Agreement.Kdf;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Parameters;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Math;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Security;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Agreement
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{
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public class ECDHWithKdfBasicAgreement
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: ECDHBasicAgreement
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{
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private readonly string algorithm;
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private readonly IDerivationFunction kdf;
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public ECDHWithKdfBasicAgreement(
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string algorithm,
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IDerivationFunction kdf)
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{
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if (algorithm == null)
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throw new ArgumentNullException("algorithm");
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if (kdf == null)
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throw new ArgumentNullException("kdf");
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this.algorithm = algorithm;
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this.kdf = kdf;
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}
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public override BigInteger CalculateAgreement(
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ICipherParameters pubKey)
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{
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// Note that the ec.KeyAgreement class in JCE only uses kdf in one
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// of the engineGenerateSecret methods.
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BigInteger result = base.CalculateAgreement(pubKey);
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int keySize = GeneratorUtilities.GetDefaultKeySize(algorithm);
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DHKdfParameters dhKdfParams = new DHKdfParameters(
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new DerObjectIdentifier(algorithm),
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keySize,
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BigIntToBytes(result));
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kdf.Init(dhKdfParams);
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byte[] keyBytes = new byte[keySize / 8];
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kdf.GenerateBytes(keyBytes, 0, keyBytes.Length);
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return new BigInteger(1, keyBytes);
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}
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private byte[] BigIntToBytes(BigInteger r)
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{
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int byteLength = X9IntegerConverter.GetByteLength(privKey.Parameters.Curve);
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return X9IntegerConverter.IntegerToBytes(r, byteLength);
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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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