You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
77 lines
3.1 KiB
77 lines
3.1 KiB
1 year ago
|
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
|
||
|
|
#pragma warning disable
|
||
|
|
using System;
|
||
|
|
using BestHTTP.SecureProtocol.Org.BouncyCastle.Math;
|
||
|
|
using BestHTTP.SecureProtocol.Org.BouncyCastle.Math.EC;
|
||
|
|
using BestHTTP.SecureProtocol.Org.BouncyCastle.Security;
|
||
|
|
using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto;
|
||
|
|
using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Parameters;
|
||
|
|
|
||
|
|
namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Agreement
|
||
|
|
{
|
||
|
|
/**
|
||
|
|
* P1363 7.2.2 ECSVDP-DHC
|
||
|
|
*
|
||
|
|
* ECSVDP-DHC is Elliptic Curve Secret Value Derivation Primitive,
|
||
|
|
* Diffie-Hellman version with cofactor multiplication. It is based on
|
||
|
|
* the work of [DH76], [Mil86], [Kob87], [LMQ98] and [Kal98a]. This
|
||
|
|
* primitive derives a shared secret value from one party's private key
|
||
|
|
* and another party's public key, where both have the same set of EC
|
||
|
|
* domain parameters. If two parties correctly execute this primitive,
|
||
|
|
* they will produce the same output. This primitive can be invoked by a
|
||
|
|
* scheme to derive a shared secret key; specifically, it may be used
|
||
|
|
* with the schemes ECKAS-DH1 and DL/ECKAS-DH2. It does not assume the
|
||
|
|
* validity of the input public key (see also Section 7.2.1).
|
||
|
|
* <p>
|
||
|
|
* Note: As stated P1363 compatibility mode with ECDH can be preset, and
|
||
|
|
* in this case the implementation doesn't have a ECDH compatibility mode
|
||
|
|
* (if you want that just use ECDHBasicAgreement and note they both implement
|
||
|
|
* BasicAgreement!).</p>
|
||
|
|
*/
|
||
|
|
public class ECDHCBasicAgreement
|
||
|
|
: IBasicAgreement
|
||
|
|
{
|
||
|
|
private ECPrivateKeyParameters privKey;
|
||
|
|
|
||
|
|
public virtual void Init(
|
||
|
|
ICipherParameters parameters)
|
||
|
|
{
|
||
|
|
if (parameters is ParametersWithRandom)
|
||
|
|
{
|
||
|
|
parameters = ((ParametersWithRandom) parameters).Parameters;
|
||
|
|
}
|
||
|
|
|
||
|
|
this.privKey = (ECPrivateKeyParameters)parameters;
|
||
|
|
}
|
||
|
|
|
||
|
|
public virtual int GetFieldSize()
|
||
|
|
{
|
||
|
|
return (privKey.Parameters.Curve.FieldSize + 7) / 8;
|
||
|
|
}
|
||
|
|
|
||
|
|
public virtual BigInteger CalculateAgreement(
|
||
|
|
ICipherParameters pubKey)
|
||
|
|
{
|
||
|
|
ECPublicKeyParameters pub = (ECPublicKeyParameters)pubKey;
|
||
|
|
ECDomainParameters dp = privKey.Parameters;
|
||
|
|
if (!dp.Equals(pub.Parameters))
|
||
|
|
throw new InvalidOperationException("ECDHC public key has wrong domain parameters");
|
||
|
|
|
||
|
|
BigInteger hd = dp.H.Multiply(privKey.D).Mod(dp.N);
|
||
|
|
|
||
|
|
// Always perform calculations on the exact curve specified by our private key's parameters
|
||
|
|
ECPoint pubPoint = ECAlgorithms.CleanPoint(dp.Curve, pub.Q);
|
||
|
|
if (pubPoint.IsInfinity)
|
||
|
|
throw new InvalidOperationException("Infinity is not a valid public key for ECDHC");
|
||
|
|
|
||
|
|
ECPoint P = pubPoint.Multiply(hd).Normalize();
|
||
|
|
if (P.IsInfinity)
|
||
|
|
throw new InvalidOperationException("Infinity is not a valid agreement value for ECDHC");
|
||
|
|
|
||
|
|
return P.AffineXCoord.ToBigInteger();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#pragma warning restore
|
||
|
|
#endif
|