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public Multiply ( |
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/// <summary>
/// Computes the client session value
/// </summary>
public static byte[] ComputeClientSessionValue(byte[] serverPublicEphemeral, byte[] xdata, byte[] udata, byte[] clientPrivateEphemeral)
{
// (B - kg^x) ^ (a + ux) (mod N)
var B = new NetBigInteger(NetUtility.ToHexString(serverPublicEphemeral), 16);
var x = new NetBigInteger(NetUtility.ToHexString(xdata), 16);
var u = new NetBigInteger(NetUtility.ToHexString(udata), 16);
var a = new NetBigInteger(NetUtility.ToHexString(clientPrivateEphemeral), 16);
var bx = g.ModPow(x, N);
var btmp = B.Add(N.Multiply(k)).Subtract(bx.Multiply(k)).Mod(N);
return btmp.ModPow(x.Multiply(u).Add(a), N).ToByteArrayUnsigned();
}
/// <summary>
/// Compute server ephemeral value (B)
/// </summary>
public static byte[] ComputeServerEphemeral(byte[] serverPrivateEphemeral, byte[] verifier) // b
{
var b = new NetBigInteger(NetUtility.ToHexString(serverPrivateEphemeral), 16);
var v = new NetBigInteger(NetUtility.ToHexString(verifier), 16);
// B = kv + g^b (mod N)
var bb = g.ModPow(b, N);
var kv = v.Multiply(k);
var B = (kv.Add(bb)).Mod(N);
return B.ToByteArrayUnsigned();
}