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using System;
using System.Collections.Generic;
using System.IO;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Cmp;
using Org.BouncyCastle.Asn1.Tsp;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.X509;
namespace Org.BouncyCastle.Tsp
{
/**
* Base class for an RFC 3161 Time Stamp Request.
*/
public class TimeStampRequest
: X509ExtensionBase
{
private TimeStampReq req;
private X509Extensions extensions;
public TimeStampRequest(
TimeStampReq req)
{
this.req = req;
this.extensions = req.Extensions;
}
/**
* Create a TimeStampRequest from the past in byte array.
*
* @param req byte array containing the request.
* @throws IOException if the request is malformed.
*/
public TimeStampRequest(
byte[] req)
: this(new Asn1InputStream(req))
{
}
/**
* Create a TimeStampRequest from the past in input stream.
*
* @param in input stream containing the request.
* @throws IOException if the request is malformed.
*/
public TimeStampRequest(
Stream input)
: this(new Asn1InputStream(input))
{
}
private TimeStampRequest(
Asn1InputStream str)
{
try
{
this.req = TimeStampReq.GetInstance(str.ReadObject());
}
catch (InvalidCastException e)
{
throw new IOException("malformed request: " + e);
}
catch (ArgumentException e)
{
throw new IOException("malformed request: " + e);
}
}
public int Version
{
get { return req.Version.IntValueExact; }
}
public string MessageImprintAlgOid
{
get { return req.MessageImprint.HashAlgorithm.Algorithm.Id; }
}
public byte[] GetMessageImprintDigest()
{
return req.MessageImprint.GetHashedMessage();
}
public string ReqPolicy
{
get
{
return req.ReqPolicy == null
? null
: req.ReqPolicy.Id;
}
}
public BigInteger Nonce
{
get
{
return req.Nonce == null
? null
: req.Nonce.Value;
}
}
public bool CertReq
{
get
{
return req.CertReq == null
? false
: req.CertReq.IsTrue;
}
}
/**
* Validate the timestamp request, checking the digest to see if it is of an
* accepted type and whether it is of the correct length for the algorithm specified.
*
* @param algorithms a set of string OIDS giving accepted algorithms.
* @param policies if non-null a set of policies we are willing to sign under.
* @param extensions if non-null a set of extensions we are willing to accept.
* @throws TspException if the request is invalid, or processing fails.
*/
public void Validate(IList<string> algorithms, IList<string> policies, IList<string> extensions)
{
if (!algorithms.Contains(this.MessageImprintAlgOid))
throw new TspValidationException("request contains unknown algorithm", PkiFailureInfo.BadAlg);
if (policies != null && this.ReqPolicy != null && !policies.Contains(this.ReqPolicy))
throw new TspValidationException("request contains unknown policy", PkiFailureInfo.UnacceptedPolicy);
if (this.Extensions != null && extensions != null)
{
foreach (DerObjectIdentifier oid in this.Extensions.ExtensionOids)
{
if (!extensions.Contains(oid.Id))
throw new TspValidationException("request contains unknown extension", PkiFailureInfo.UnacceptedExtension);
}
}
int digestLength = TspUtil.GetDigestLength(this.MessageImprintAlgOid);
if (digestLength != this.GetMessageImprintDigest().Length)
throw new TspValidationException("imprint digest the wrong length", PkiFailureInfo.BadDataFormat);
}
/**
* return the ASN.1 encoded representation of this object.
*/
public byte[] GetEncoded()
{
return req.GetEncoded();
}
internal X509Extensions Extensions
{
get { return req.Extensions; }
}
public virtual bool HasExtensions
{
get { return extensions != null; }
}
public virtual X509Extension GetExtension(DerObjectIdentifier oid)
{
return extensions == null ? null : extensions.GetExtension(oid);
}
public virtual IList<DerObjectIdentifier> GetExtensionOids()
{
return TspUtil.GetExtensionOids(extensions);
}
protected override X509Extensions GetX509Extensions()
{
return Extensions;
}
}
}
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