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package org.bouncycastle.asn1.cms;
import java.io.IOException;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1SequenceParser;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.ASN1SetParser;
import org.bouncycastle.asn1.ASN1TaggedObjectParser;
import org.bouncycastle.asn1.BERTags;
/**
* Parser for <a href="http://tools.ietf.org/html/rfc5652#section-5.1">RFC 5652</a>: {@link SignedData} object.
* <p>
* <pre>
* SignedData ::= SEQUENCE {
* version CMSVersion,
* digestAlgorithms DigestAlgorithmIdentifiers,
* encapContentInfo EncapsulatedContentInfo,
* certificates [0] IMPLICIT CertificateSet OPTIONAL,
* crls [1] IMPLICIT CertificateRevocationLists OPTIONAL,
* signerInfos SignerInfos
* }
* </pre>
*/
public class SignedDataParser
{
private ASN1SequenceParser _seq;
private ASN1Integer _version;
private Object _nextObject;
private boolean _certsCalled;
private boolean _crlsCalled;
public static SignedDataParser getInstance(
Object o)
throws IOException
{
if (o instanceof ASN1Sequence)
{
return new SignedDataParser(((ASN1Sequence)o).parser());
}
if (o instanceof ASN1SequenceParser)
{
return new SignedDataParser((ASN1SequenceParser)o);
}
throw new IOException("unknown object encountered: " + o.getClass().getName());
}
private SignedDataParser(
ASN1SequenceParser seq)
throws IOException
{
this._seq = seq;
this._version = (ASN1Integer)seq.readObject();
}
public ASN1Integer getVersion()
{
return _version;
}
public ASN1SetParser getDigestAlgorithms()
throws IOException
{
Object o = _seq.readObject();
if (o instanceof ASN1Set)
{
return ((ASN1Set)o).parser();
}
return (ASN1SetParser)o;
}
public ContentInfoParser getEncapContentInfo()
throws IOException
{
return new ContentInfoParser((ASN1SequenceParser)_seq.readObject());
}
public ASN1SetParser getCertificates()
throws IOException
{
_certsCalled = true;
_nextObject = _seq.readObject();
if (_nextObject instanceof ASN1TaggedObjectParser && ((ASN1TaggedObjectParser)_nextObject).getTagNo() == 0)
{
ASN1SetParser certs = (ASN1SetParser)((ASN1TaggedObjectParser)_nextObject).getObjectParser(BERTags.SET, false);
_nextObject = null;
return certs;
}
return null;
}
public ASN1SetParser getCrls()
throws IOException
{
if (!_certsCalled)
{
throw new IOException("getCerts() has not been called.");
}
_crlsCalled = true;
if (_nextObject == null)
{
_nextObject = _seq.readObject();
}
if (_nextObject instanceof ASN1TaggedObjectParser && ((ASN1TaggedObjectParser)_nextObject).getTagNo() == 1)
{
ASN1SetParser crls = (ASN1SetParser)((ASN1TaggedObjectParser)_nextObject).getObjectParser(BERTags.SET, false);
_nextObject = null;
return crls;
}
return null;
}
public ASN1SetParser getSignerInfos()
throws IOException
{
if (!_certsCalled || !_crlsCalled)
{
throw new IOException("getCerts() and/or getCrls() has not been called.");
}
if (_nextObject == null)
{
_nextObject = _seq.readObject();
}
return (ASN1SetParser)_nextObject;
}
}
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