RS256.cs

using System;
using System.Security.Cryptography;
using Waher.Script;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Exceptions;
using Waher.Script.Model;
using Waher.Script.Objects;
 
namespace Waher.Security.JWS.Functions
{
    public class RS256 : FunctionMultiVariate
    {
        public RS256(int Start, int Length, Expression Expression)
            : base(Array.Empty<ScriptNode>(), argumentTypes0, Start, Length, Expression)
        {
        }
 
        public RS256(ScriptNode Rsa, int Start, int Length, Expression Expression)
            : base(new ScriptNode[] { Rsa }, argumentTypes1Scalar, Start, Length, Expression)
        {
        }
 
        public override string FunctionName => nameof(RS256);
 
        public override string[] DefaultArgumentNames => new string[] { "Rsa" };
 
        public override IElement Evaluate(IElement[] Arguments, Variables Variables)
        {
            if (Arguments.Length == 0)
                return new ObjectValue(new RsaSsaPkcsSha256());
 
            object Obj = Arguments[0].AssociatedObjectValue;
 
            if (Obj is RSA Rsa)
                return new ObjectValue(new RsaSsaPkcsSha256(Rsa));
            else if (Obj is RSAParameters Parameters)
                return new ObjectValue(new RsaSsaPkcsSha256(Parameters));
            else if (Obj is double NrBits)
                return new ObjectValue(new RsaSsaPkcsSha256((int)NrBits));
            else
                throw new ScriptRuntimeException("Expected argument to be an RSA object, RSAParameters object, or a number of bits.", this);
        }
    }
}