Sha2_256.cs

using System;
using System.Threading.Tasks;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Exceptions;
using Waher.Script.Model;
using Waher.Script.Objects;
using Waher.Security;
 
namespace Waher.Script.Cryptography.Functions.HashFunctions
{
    public class Sha2_256 : FunctionOneScalarVariable
    {
        public Sha2_256(ScriptNode Data, int Start, int Length, Expression Expression)
            : base(Data, Start, Length, Expression)
        {
        }
 
        public override string FunctionName => nameof(Sha2_256);
 
        public override IElement EvaluateScalar(IElement Argument, Variables Variables)
        {
            if (!(Argument.AssociatedObjectValue is byte[] Bin))
            {
                if (!(Argument.AssociatedObjectValue is string s))
                    s = Expression.ToString(Argument.AssociatedObjectValue);
 
                return this.EvaluateScalar(s, Variables);
            }
 
            return new ObjectValue(Hashes.ComputeSHA256Hash(Bin));
        }
 
        public override Task<IElement> EvaluateScalarAsync(IElement Argument, Variables Variables)
        {
            return Task.FromResult(this.EvaluateScalar(Argument, Variables));
        }
 
        public override IElement EvaluateScalar(string Argument, Variables Variables)
        {
            byte[] Bin = System.Text.Encoding.UTF8.GetBytes(Argument);
            return new ObjectValue(Hashes.ComputeSHA256Hash(Bin));
        }
 
        public override Task<IElement> EvaluateScalarAsync(string Argument, Variables Variables)
        {
            return Task.FromResult(this.EvaluateScalar(Argument, Variables));
        }
 
    }
}