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package org.spongycastle.tsp;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.spongycastle.asn1.ASN1InputStream;
import org.spongycastle.asn1.cmp.PKIFailureInfo;
import org.spongycastle.asn1.cmp.PKIFreeText;
import org.spongycastle.asn1.cmp.PKIStatus;
import org.spongycastle.asn1.cms.Attribute;
import org.spongycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.spongycastle.asn1.tsp.TimeStampResp;
import org.spongycastle.util.Arrays;
/**
* Base class for an RFC 3161 Time Stamp Response object.
*/
public class TimeStampResponse
{
TimeStampResp resp;
TimeStampToken timeStampToken;
public TimeStampResponse(TimeStampResp resp)
throws TSPException, IOException
{
this.resp = resp;
if (resp.getTimeStampToken() != null)
{
timeStampToken = new TimeStampToken(resp.getTimeStampToken());
}
}
/**
* 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)
throws TSPException, IOException
{
this(new ByteArrayInputStream(resp));
}
/**
* Create a TimeStampResponse from an input stream containing an ASN.1 encoding.
*
* @param in 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(InputStream in)
throws TSPException, IOException
{
this(readTimeStampResp(in));
}
private static TimeStampResp readTimeStampResp(
InputStream in)
throws IOException, TSPException
{
try
{
return TimeStampResp.getInstance(new ASN1InputStream(in).readObject());
}
catch (IllegalArgumentException e)
{
throw new TSPException("malformed timestamp response: " + e, e);
}
catch (ClassCastException e)
{
throw new TSPException("malformed timestamp response: " + e, e);
}
}
public int getStatus()
{
return resp.getStatus().getStatus().intValue();
}
public String getStatusString()
{
if (resp.getStatus().getStatusString() != null)
{
StringBuffer statusStringBuf = new StringBuffer();
PKIFreeText text = resp.getStatus().getStatusString();
for (int i = 0; i != text.size(); i++)
{
statusStringBuf.append(text.getStringAt(i).getString());
}
return statusStringBuf.toString();
}
else
{
return null;
}
}
public PKIFailureInfo getFailInfo()
{
if (resp.getStatus().getFailInfo() != null)
{
return new PKIFailureInfo(resp.getStatus().getFailInfo());
}
return null;
}
public TimeStampToken getTimeStampToken()
{
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)
throws TSPException
{
TimeStampToken tok = this.getTimeStampToken();
if (tok != null)
{
TimeStampTokenInfo tstInfo = tok.getTimeStampInfo();
if (request.getNonce() != null && !request.getNonce().equals(tstInfo.getNonce()))
{
throw new TSPValidationException("response contains wrong nonce value.");
}
if (this.getStatus() != PKIStatus.GRANTED && this.getStatus() != PKIStatus.GRANTED_WITH_MODS)
{
throw new TSPValidationException("time stamp token found in failed request.");
}
if (!Arrays.constantTimeAreEqual(request.getMessageImprintDigest(), tstInfo.getMessageImprintDigest()))
{
throw new TSPValidationException("response for different message imprint digest.");
}
if (!tstInfo.getMessageImprintAlgOID().equals(request.getMessageImprintAlgOID()))
{
throw new TSPValidationException("response for different message imprint algorithm.");
}
Attribute scV1 = tok.getSignedAttributes().get(PKCSObjectIdentifiers.id_aa_signingCertificate);
Attribute scV2 = tok.getSignedAttributes().get(PKCSObjectIdentifiers.id_aa_signingCertificateV2);
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.getReqPolicy() != null && !request.getReqPolicy().equals(tstInfo.getPolicy()))
{
throw new TSPValidationException("TSA policy wrong for request.");
}
}
else if (this.getStatus() == PKIStatus.GRANTED || this.getStatus() == PKIStatus.GRANTED_WITH_MODS)
{
throw new TSPValidationException("no time stamp token found and one expected.");
}
}
/**
* return the ASN.1 encoded representation of this object.
*/
public byte[] getEncoded() throws IOException
{
return resp.getEncoded();
}
}
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