OtherHash.cs :  » PDF » iTextSharp » Org » BouncyCastle » Asn1 » Esf » C# / CSharp Open Source

using System;

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

namespace Org.BouncyCastle.Asn1.Esf{
  /// <remarks>
  /// <code>
  /// OtherHash ::= CHOICE {
  ///    sha1Hash  OtherHashValue, -- This contains a SHA-1 hash
  ///   otherHash  OtherHashAlgAndValue
  ///  }
  ///  
  ///  OtherHashValue ::= OCTET STRING
  /// </code>
  /// </remarks>
  public class OtherHash
    : Asn1Encodable, IAsn1Choice
  {
    private readonly Asn1OctetString    sha1Hash;
    private readonly OtherHashAlgAndValue  otherHash;

    public static OtherHash GetInstance(
      object obj)
    {
      if (obj == null || obj is OtherHash)
        return (OtherHash) obj;

      if (obj is Asn1OctetString)
        return new OtherHash((Asn1OctetString) obj);

      return new OtherHash(
        OtherHashAlgAndValue.GetInstance(obj));
    }

    public OtherHash(
      byte[] sha1Hash)
    {
      if (sha1Hash == null)
        throw new ArgumentNullException("sha1Hash");

      this.sha1Hash = new DerOctetString(sha1Hash);
    }

    public OtherHash(
      Asn1OctetString sha1Hash)
    {
      if (sha1Hash == null)
        throw new ArgumentNullException("sha1Hash");

      this.sha1Hash = sha1Hash;
    }

    public OtherHash(
      OtherHashAlgAndValue otherHash)
    {
      if (otherHash == null)
        throw new ArgumentNullException("otherHash");

      this.otherHash = otherHash;
    }

    public AlgorithmIdentifier HashAlgorithm
    {
      get
      {
        return otherHash == null
          ?  new AlgorithmIdentifier(OiwObjectIdentifiers.IdSha1)
          :  otherHash.HashAlgorithm;
      }
    }

    public byte[] GetHashValue()
    {
      return otherHash == null
        ?  sha1Hash.GetOctets()
        :  otherHash.GetHashValue();
    }

    public override Asn1Object ToAsn1Object()
    {
      return otherHash == null
        ?  sha1Hash
        :  otherHash.ToAsn1Object();
    }
  }
}