Rsa.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
 
namespace Waher.Security.PKCS
{
    public abstract class Rsa : SignatureAlgorithm
    {
        private readonly RSA rsa;
 
        public Rsa(RSA RSA)
        {
            this.rsa = RSA;
        }
 
        public override string PkiAlgorithmOID => "1.2.840.113549.1.1.1";
 
        public abstract HashAlgorithmName HashAlgorithmName
        {
            get;
        }
 
        public override void ExportPublicKey(DerEncoder Output)
        {
            RSAParameters Parameters = this.rsa.ExportParameters(false);
            
            Output.StartSEQUENCE();
            Output.INTEGER(Parameters.Modulus, false);
            Output.INTEGER(Parameters.Exponent, false);
            Output.EndSEQUENCE();
        }
 
        public override void ExportPrivateKey(DerEncoder Output)
        {
            RSAParameters Parameters = this.rsa.ExportParameters(true);
 
            Output.StartSEQUENCE();
            Output.INTEGER(0);  // Version
            Output.INTEGER(Parameters.Modulus, false);
            Output.INTEGER(Parameters.Exponent, false);
            Output.INTEGER(Parameters.D, false);
            Output.INTEGER(Parameters.P, false);
            Output.INTEGER(Parameters.Q, false);
            Output.INTEGER(Parameters.DP, false);
            Output.INTEGER(Parameters.DQ, false);
            Output.INTEGER(Parameters.InverseQ, false);
            Output.EndSEQUENCE();
        }
 
        public override byte[] Sign(byte[] Data)
        {
            return this.rsa.SignData(Data, this.HashAlgorithmName, RSASignaturePadding.Pkcs1);
        }
    }
}