SubjectPublicKeyInfo.cs :  » PDF » iTextSharp » Org » BouncyCastle » Asn1 » X509 » C# / CSharp Open Source

using System;
using System.Collections;
using System.IO;

namespace Org.BouncyCastle.Asn1.X509{
    /**
     * The object that contains the public key stored in a certficate.
     * <p>
     * The GetEncoded() method in the public keys in the JCE produces a DER
     * encoded one of these.</p>
     */
    public class SubjectPublicKeyInfo
        : Asn1Encodable
    {
        private readonly AlgorithmIdentifier  algID;
        private readonly DerBitString      keyData;

    public static SubjectPublicKeyInfo GetInstance(
            Asn1TaggedObject  obj,
            bool        explicitly)
        {
            return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
        }

    public static SubjectPublicKeyInfo GetInstance(
            object obj)
        {
            if (obj is SubjectPublicKeyInfo)
            {
                return (SubjectPublicKeyInfo) obj;
            }

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

      throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
        }

    public SubjectPublicKeyInfo(
            AlgorithmIdentifier  algID,
            Asn1Encodable    publicKey)
        {
            this.keyData = new DerBitString(publicKey);
            this.algID = algID;
        }

    public SubjectPublicKeyInfo(
            AlgorithmIdentifier  algID,
            byte[]        publicKey)
        {
            this.keyData = new DerBitString(publicKey);
            this.algID = algID;
        }

    private SubjectPublicKeyInfo(
            Asn1Sequence seq)
        {
      if (seq.Count != 2)
        throw new ArgumentException("Bad sequence size: " + seq.Count, "seq");

            this.algID = AlgorithmIdentifier.GetInstance(seq[0]);
      this.keyData = DerBitString.GetInstance(seq[1]);
    }

    public AlgorithmIdentifier AlgorithmID
        {
      get { return algID; }
        }

    /**
         * for when the public key is an encoded object - if the bitstring
         * can't be decoded this routine raises an IOException.
         *
         * @exception IOException - if the bit string doesn't represent a Der
         * encoded object.
         */
        public Asn1Object GetPublicKey()
        {
      return Asn1Object.FromByteArray(keyData.GetBytes());
        }

    /**
         * for when the public key is raw bits...
         */
        public DerBitString PublicKeyData
        {
      get { return keyData; }
        }

    /**
         * Produce an object suitable for an Asn1OutputStream.
         * <pre>
         * SubjectPublicKeyInfo ::= Sequence {
         *                          algorithm AlgorithmIdentifier,
         *                          publicKey BIT STRING }
         * </pre>
         */
        public override Asn1Object ToAsn1Object()
        {
      return new DerSequence(algID, keyData);
        }
    }
}