RsaPublicBcpgKey.cs :  » PDF » iTextSharp » Org » BouncyCastle » Bcpg » C# / CSharp Open Source

using System;

using Org.BouncyCastle.Math;

namespace Org.BouncyCastle.Bcpg{
  /// <remarks>Base class for an RSA public key.</remarks>
  public class RsaPublicBcpgKey
    : BcpgObject, IBcpgKey
  {
    private readonly MPInteger n, e;

    /// <summary>Construct an RSA public key from the passed in stream.</summary>
    public RsaPublicBcpgKey(
      BcpgInputStream bcpgIn)
    {
      this.n = new MPInteger(bcpgIn);
      this.e = new MPInteger(bcpgIn);
    }

    /// <param name="n">The modulus.</param>
    /// <param name="e">The public exponent.</param>
    public RsaPublicBcpgKey(
      BigInteger  n,
      BigInteger  e)
    {
      this.n = new MPInteger(n);
      this.e = new MPInteger(e);
    }

    public BigInteger PublicExponent
    {
      get { return e.Value; }
    }

    public BigInteger Modulus
    {
      get { return n.Value; }
    }

    /// <summary>The format, as a string, always "PGP".</summary>
    public string Format
    {
      get { return "PGP"; }
    }

    /// <summary>Return the standard PGP encoding of the key.</summary>
    public override byte[] GetEncoded()
    {
      try
      {
        return base.GetEncoded();
      }
      catch (Exception)
      {
        return null;
      }
    }

    public override void Encode(
      BcpgOutputStream bcpgOut)
    {
      bcpgOut.WriteObjects(n, e);
    }
  }
}