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67 lines
1.9 KiB
67 lines
1.9 KiB
#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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