PasswordRecipientInfo.cs :  » PDF » iTextSharp » Org » BouncyCastle » Asn1 » Cms » C# / CSharp Open Source

using System;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.X509;

namespace Org.BouncyCastle.Asn1.Cms{
    public class PasswordRecipientInfo
        : Asn1Encodable
    {
        private readonly DerInteger        version;
        private readonly AlgorithmIdentifier  keyDerivationAlgorithm;
        private readonly AlgorithmIdentifier  keyEncryptionAlgorithm;
        private readonly Asn1OctetString    encryptedKey;

    public PasswordRecipientInfo(
            AlgorithmIdentifier  keyEncryptionAlgorithm,
            Asn1OctetString    encryptedKey)
        {
            this.version = new DerInteger(0);
            this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
            this.encryptedKey = encryptedKey;
        }

    public PasswordRecipientInfo(
      AlgorithmIdentifier  keyDerivationAlgorithm,
      AlgorithmIdentifier  keyEncryptionAlgorithm,
      Asn1OctetString    encryptedKey)
    {
      this.version = new DerInteger(0);
      this.keyDerivationAlgorithm = keyDerivationAlgorithm;
      this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
      this.encryptedKey = encryptedKey;
    }

    public PasswordRecipientInfo(
            Asn1Sequence seq)
        {
            version = (DerInteger) seq[0];

      if (seq[1] is Asn1TaggedObject)
            {
                keyDerivationAlgorithm = AlgorithmIdentifier.GetInstance((Asn1TaggedObject) seq[1], false);
                keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[2]);
                encryptedKey = (Asn1OctetString) seq[3];
            }
            else
            {
                keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[1]);
                encryptedKey = (Asn1OctetString) seq[2];
            }
        }

    /**
         * return a PasswordRecipientInfo object from a tagged object.
         *
         * @param obj the tagged object holding the object we want.
         * @param explicitly true if the object is meant to be explicitly
         *              tagged false otherwise.
         * @exception ArgumentException if the object held by the
         *          tagged object cannot be converted.
         */
        public static PasswordRecipientInfo GetInstance(
            Asn1TaggedObject  obj,
            bool        explicitly)
        {
            return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
        }

    /**
         * return a PasswordRecipientInfo object from the given object.
         *
         * @param obj the object we want converted.
         * @exception ArgumentException if the object cannot be converted.
         */
        public static PasswordRecipientInfo GetInstance(
            object obj)
        {
            if (obj == null || obj is PasswordRecipientInfo)
            {
                return (PasswordRecipientInfo) obj;
            }

      if (obj is Asn1Sequence)
            {
                return new PasswordRecipientInfo((Asn1Sequence) obj);
            }

      throw new ArgumentException("Invalid PasswordRecipientInfo: " + obj.GetType().Name);
        }

    public DerInteger Version
    {
      get { return version; }
    }

    public AlgorithmIdentifier KeyDerivationAlgorithm
    {
      get { return keyDerivationAlgorithm; }
    }

    public AlgorithmIdentifier KeyEncryptionAlgorithm
    {
      get { return keyEncryptionAlgorithm; }
    }

    public Asn1OctetString EncryptedKey
    {
      get { return encryptedKey; }
    }

    /**
         * Produce an object suitable for an Asn1OutputStream.
         * <pre>
         * PasswordRecipientInfo ::= Sequence {
         *   version CMSVersion,   -- Always set to 0
         *   keyDerivationAlgorithm [0] KeyDerivationAlgorithmIdentifier
         *                             OPTIONAL,
         *  keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
         *  encryptedKey EncryptedKey }
         * </pre>
         */
        public override Asn1Object ToAsn1Object()
        {
            Asn1EncodableVector v = new Asn1EncodableVector(version);

      if (keyDerivationAlgorithm != null)
            {
                v.Add(new DerTaggedObject(false, 0, keyDerivationAlgorithm));
            }

      v.Add(keyEncryptionAlgorithm, encryptedKey);

      return new DerSequence(v);
        }
    }
}