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using System;
using System.IO;
using System.Text;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Cmp;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.Tsp;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Tsp
{
/**
* Base class for an RFC 3161 Time Stamp Response object.
*/
public class TimeStampResponse
{
private TimeStampResp resp;
private TimeStampToken timeStampToken;
public TimeStampResponse(
TimeStampResp resp)
{
this.resp = resp;
if (resp.TimeStampToken != null)
{
timeStampToken = new TimeStampToken(resp.TimeStampToken);
}
}
/**
* Create a TimeStampResponse from a byte array containing an ASN.1 encoding.
*
* @param resp the byte array containing the encoded response.
* @throws TspException if the response is malformed.
* @throws IOException if the byte array doesn't represent an ASN.1 encoding.
*/
public TimeStampResponse(
byte[] resp)
: this(readTimeStampResp(new Asn1InputStream(resp)))
{
}
/**
* Create a TimeStampResponse from an input stream containing an ASN.1 encoding.
*
* @param input the input stream containing the encoded response.
* @throws TspException if the response is malformed.
* @throws IOException if the stream doesn't represent an ASN.1 encoding.
*/
public TimeStampResponse(
Stream input)
: this(readTimeStampResp(new Asn1InputStream(input)))
{
}
private static TimeStampResp readTimeStampResp(
Asn1InputStream input)
{
try
{
return TimeStampResp.GetInstance(input.ReadObject());
}
catch (ArgumentException e)
{
throw new TspException("malformed timestamp response: " + e, e);
}
catch (InvalidCastException e)
{
throw new TspException("malformed timestamp response: " + e, e);
}
}
public int Status
{
get { return resp.Status.Status.IntValue; }
}
public string GetStatusString()
{
if (resp.Status.StatusString == null)
{
return null;
}
StringBuilder statusStringBuf = new StringBuilder();
PkiFreeText text = resp.Status.StatusString;
for (int i = 0; i != text.Count; i++)
{
statusStringBuf.Append(text[i].GetString());
}
return statusStringBuf.ToString();
}
public PkiFailureInfo GetFailInfo()
{
if (resp.Status.FailInfo == null)
{
return null;
}
return new PkiFailureInfo(resp.Status.FailInfo);
}
public TimeStampToken TimeStampToken
{
get { return timeStampToken; }
}
/**
* Check this response against to see if it a well formed response for
* the passed in request. Validation will include checking the time stamp
* token if the response status is GRANTED or GRANTED_WITH_MODS.
*
* @param request the request to be checked against
* @throws TspException if the request can not match this response.
*/
public void Validate(
TimeStampRequest request)
{
TimeStampToken tok = this.TimeStampToken;
if (tok != null)
{
TimeStampTokenInfo tstInfo = tok.TimeStampInfo;
if (request.Nonce != null && !request.Nonce.Equals(tstInfo.Nonce))
{
throw new TspValidationException("response contains wrong nonce value.");
}
if (this.Status != (int) PkiStatus.Granted && this.Status != (int) PkiStatus.GrantedWithMods)
{
throw new TspValidationException("time stamp token found in failed request.");
}
if (!Arrays.FixedTimeEquals(request.GetMessageImprintDigest(), tstInfo.GetMessageImprintDigest()))
{
throw new TspValidationException("response for different message imprint digest.");
}
if (!tstInfo.MessageImprintAlgOid.Equals(request.MessageImprintAlgOid))
{
throw new TspValidationException("response for different message imprint algorithm.");
}
Asn1.Cms.Attribute scV1 = tok.SignedAttributes[PkcsObjectIdentifiers.IdAASigningCertificate];
Asn1.Cms.Attribute scV2 = tok.SignedAttributes[PkcsObjectIdentifiers.IdAASigningCertificateV2];
if (scV1 == null && scV2 == null)
{
throw new TspValidationException("no signing certificate attribute present.");
}
if (scV1 != null && scV2 != null)
{
/*
* RFC 5035 5.4. If both attributes exist in a single message,
* they are independently evaluated.
*/
}
if (request.ReqPolicy != null && !request.ReqPolicy.Equals(tstInfo.Policy))
{
throw new TspValidationException("TSA policy wrong for request.");
}
}
else if (this.Status == (int) PkiStatus.Granted || this.Status == (int) PkiStatus.GrantedWithMods)
{
throw new TspValidationException("no time stamp token found and one expected.");
}
}
/**
* return the ASN.1 encoded representation of this object.
*/
public byte[] GetEncoded()
{
return resp.GetEncoded();
}
/**
* return the ASN.1 encoded representation of this object for the specific encoding type.
*
* @param encoding encoding style ("DER", "DL", "BER")
*/
public byte[] GetEncoded(string encoding)
{
if (Asn1Encodable.DL.Equals(encoding))
{
if (timeStampToken == null)
return new DLSequence(resp.Status).GetEncoded(encoding);
return new DLSequence(resp.Status, timeStampToken.ToCmsSignedData().ContentInfo).GetEncoded(encoding);
}
return resp.GetEncoded(encoding);
}
}
}
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