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

using System;

using Org.BouncyCastle.Asn1.X509;

namespace Org.BouncyCastle.Asn1.Esf{
  /// <summary>
  /// Summary description for OtherHashAlgAndValue.
  /// </summary>
  /// <remarks>
  /// <code>
  /// OtherHashAlgAndValue ::= SEQUENCE {
  ///    hashAlgorithm  AlgorithmIdentifier,
  ///   hashValue    OtherHashValue
  /// }
  /// 
  /// OtherHashValue ::= OCTET STRING
  /// </code>
  /// </remarks>
  public class OtherHashAlgAndValue
    : Asn1Encodable
  {
    private readonly AlgorithmIdentifier  hashAlgorithm;
    private readonly Asn1OctetString    hashValue;

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

      if (obj is Asn1Sequence)
        return new OtherHashAlgAndValue((Asn1Sequence) obj);

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

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

      this.hashAlgorithm = AlgorithmIdentifier.GetInstance(seq[0].ToAsn1Object());
      this.hashValue = (Asn1OctetString) seq[1].ToAsn1Object();
    }

    public OtherHashAlgAndValue(
      AlgorithmIdentifier  hashAlgorithm,
      byte[]        hashValue)
    {
      if (hashAlgorithm == null)
        throw new ArgumentNullException("hashAlgorithm");
      if (hashValue == null)
        throw new ArgumentNullException("hashValue");

      this.hashAlgorithm = hashAlgorithm;
      this.hashValue = new DerOctetString(hashValue);
    }

    public OtherHashAlgAndValue(
      AlgorithmIdentifier  hashAlgorithm,
      Asn1OctetString    hashValue)
    {
      if (hashAlgorithm == null)
        throw new ArgumentNullException("hashAlgorithm");
      if (hashValue == null)
        throw new ArgumentNullException("hashValue");

      this.hashAlgorithm = hashAlgorithm;
      this.hashValue = hashValue;
    }

    public AlgorithmIdentifier HashAlgorithm
    {
      get { return hashAlgorithm; }
    }

    public byte[] GetHashValue()
    {
      return hashValue.GetOctets();
    }

    public override Asn1Object ToAsn1Object()
    {
      return new DerSequence(hashAlgorithm, hashValue);
    }
  }
}