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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.Cms;
using Org.BouncyCastle.Asn1.Tsp;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Math;
namespace Org.BouncyCastle.Tsp
{
/**
* Generator for RFC 3161 Time Stamp Responses.
*/
public class TimeStampResponseGenerator
{
private PkiStatus status;
private Asn1EncodableVector statusStrings;
private int failInfo;
private TimeStampTokenGenerator tokenGenerator;
private IList<string> acceptedAlgorithms;
private IList<string> acceptedPolicies;
private IList<string> acceptedExtensions;
public TimeStampResponseGenerator(
TimeStampTokenGenerator tokenGenerator,
IList<string> acceptedAlgorithms)
: this(tokenGenerator, acceptedAlgorithms, null, null)
{
}
public TimeStampResponseGenerator(
TimeStampTokenGenerator tokenGenerator,
IList<string> acceptedAlgorithms,
IList<string> acceptedPolicy)
: this(tokenGenerator, acceptedAlgorithms, acceptedPolicy, null)
{
}
public TimeStampResponseGenerator(
TimeStampTokenGenerator tokenGenerator,
IList<string> acceptedAlgorithms,
IList<string> acceptedPolicies,
IList<string> acceptedExtensions)
{
this.tokenGenerator = tokenGenerator;
this.acceptedAlgorithms = acceptedAlgorithms;
this.acceptedPolicies = acceptedPolicies;
this.acceptedExtensions = acceptedExtensions;
statusStrings = new Asn1EncodableVector();
}
private void AddStatusString(string statusString)
{
statusStrings.Add(new DerUtf8String(statusString));
}
private void SetFailInfoField(int field)
{
failInfo |= field;
}
private PkiStatusInfo GetPkiStatusInfo()
{
Asn1EncodableVector v = new Asn1EncodableVector(
new DerInteger((int)status));
if (statusStrings.Count > 0)
{
v.Add(new PkiFreeText(new DerSequence(statusStrings)));
}
if (failInfo != 0)
{
v.Add(new FailInfo(failInfo));
}
return PkiStatusInfo.GetInstance(new DerSequence(v));
}
/**
* Return an appropriate TimeStampResponse.
* <p>
* If genTime is null a timeNotAvailable error response will be returned.
*
* @param request the request this response is for.
* @param serialNumber serial number for the response token.
* @param genTime generation time for the response token.
* @param provider provider to use for signature calculation.
* @return
* @throws NoSuchAlgorithmException
* @throws NoSuchProviderException
* @throws TSPException
* </p>
*/
public TimeStampResponse Generate(TimeStampRequest request, BigInteger serialNumber, DateTime? genTime)
{
TimeStampResp resp;
try
{
if (genTime == null)
throw new TspValidationException("The time source is not available.",
PkiFailureInfo.TimeNotAvailable);
request.Validate(acceptedAlgorithms, acceptedPolicies, acceptedExtensions);
this.status = PkiStatus.Granted;
this.AddStatusString("Operation Okay");
PkiStatusInfo pkiStatusInfo = GetPkiStatusInfo();
ContentInfo tstTokenContentInfo;
try
{
TimeStampToken token = tokenGenerator.Generate(request, serialNumber, genTime.Value);
byte[] encoded = token.ToCmsSignedData().GetEncoded();
tstTokenContentInfo = ContentInfo.GetInstance(Asn1Object.FromByteArray(encoded));
}
catch (IOException e)
{
throw new TspException("Timestamp token received cannot be converted to ContentInfo", e);
}
resp = new TimeStampResp(pkiStatusInfo, tstTokenContentInfo);
}
catch (TspValidationException e)
{
status = PkiStatus.Rejection;
this.SetFailInfoField(e.FailureCode);
this.AddStatusString(e.Message);
PkiStatusInfo pkiStatusInfo = GetPkiStatusInfo();
resp = new TimeStampResp(pkiStatusInfo, null);
}
try
{
return new TimeStampResponse(resp);
}
catch (IOException e)
{
throw new TspException("created badly formatted response!", e);
}
}
public TimeStampResponse GenerateGrantedResponse(TimeStampRequest request, BigInteger serialNumber,
DateTime? genTime, string statusString, X509Extensions additionalExtensions)
{
TimeStampResp resp;
try
{
if (genTime == null)
throw new TspValidationException("The time source is not available.",
PkiFailureInfo.TimeNotAvailable);
request.Validate(acceptedAlgorithms, acceptedPolicies, acceptedExtensions);
this.status = PkiStatus.Granted;
this.AddStatusString(statusString);
PkiStatusInfo pkiStatusInfo = GetPkiStatusInfo();
ContentInfo tstTokenContentInfo;
try
{
TimeStampToken token = tokenGenerator.Generate(request, serialNumber, genTime.Value,additionalExtensions);
byte[] encoded = token.ToCmsSignedData().GetEncoded();
tstTokenContentInfo = ContentInfo.GetInstance(Asn1Object.FromByteArray(encoded));
}
catch (IOException e)
{
throw new TspException("Timestamp token received cannot be converted to ContentInfo", e);
}
resp = new TimeStampResp(pkiStatusInfo, tstTokenContentInfo);
}
catch (TspValidationException e)
{
status = PkiStatus.Rejection;
this.SetFailInfoField(e.FailureCode);
this.AddStatusString(e.Message);
PkiStatusInfo pkiStatusInfo = GetPkiStatusInfo();
resp = new TimeStampResp(pkiStatusInfo, null);
}
try
{
return new TimeStampResponse(resp);
}
catch (IOException e)
{
throw new TspException("created badly formatted response!", e);
}
}
class FailInfo
: DerBitString
{
internal FailInfo(int failInfoValue)
: base(failInfoValue)
{
}
}
/**
* Generate a TimeStampResponse with chosen status and FailInfoField.
*
* @param status the PKIStatus to set.
* @param failInfoField the FailInfoField to set.
* @param statusString an optional string describing the failure.
* @return a TimeStampResponse with a failInfoField and optional statusString
* @throws TSPException in case the response could not be created
*/
public TimeStampResponse GenerateFailResponse(PkiStatus status, int failInfoField, string statusString)
{
this.status = status;
this.SetFailInfoField(failInfoField);
if (statusString != null)
{
this.AddStatusString(statusString);
}
PkiStatusInfo pkiStatusInfo = GetPkiStatusInfo();
TimeStampResp resp = new TimeStampResp(pkiStatusInfo, null);
try
{
return new TimeStampResponse(resp);
}
catch (IOException e)
{
throw new TspException("created badly formatted response!", e);
}
}
}
}
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