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using System;
using System.Collections;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Asn1.Cms
{
public class SignerInfo
: Asn1Encodable
{
private DerInteger version;
private SignerIdentifier sid;
private AlgorithmIdentifier digAlgorithm;
private Asn1Set authenticatedAttributes;
private AlgorithmIdentifier digEncryptionAlgorithm;
private Asn1OctetString encryptedDigest;
private Asn1Set unauthenticatedAttributes;
public static SignerInfo GetInstance(
object obj)
{
if (obj == null || obj is SignerInfo)
return (SignerInfo) obj;
if (obj is Asn1Sequence)
return new SignerInfo((Asn1Sequence) obj);
throw new ArgumentException("Unknown object in factory: " + obj.GetType().FullName, "obj");
}
public SignerInfo(
SignerIdentifier sid,
AlgorithmIdentifier digAlgorithm,
Asn1Set authenticatedAttributes,
AlgorithmIdentifier digEncryptionAlgorithm,
Asn1OctetString encryptedDigest,
Asn1Set unauthenticatedAttributes)
{
if (sid.IsTagged)
{
this.version = new DerInteger(3);
}
else
{
this.version = new DerInteger(1);
}
this.sid = sid;
this.digAlgorithm = digAlgorithm;
this.authenticatedAttributes = authenticatedAttributes;
this.digEncryptionAlgorithm = digEncryptionAlgorithm;
this.encryptedDigest = encryptedDigest;
this.unauthenticatedAttributes = unauthenticatedAttributes;
}
public SignerInfo(
Asn1Sequence seq)
{
IEnumerator e = seq.GetEnumerator();
e.MoveNext();
version = (DerInteger) e.Current;
e.MoveNext();
sid = SignerIdentifier.GetInstance(e.Current);
e.MoveNext();
digAlgorithm = AlgorithmIdentifier.GetInstance(e.Current);
e.MoveNext();
object obj = e.Current;
if (obj is Asn1TaggedObject)
{
authenticatedAttributes = Asn1Set.GetInstance((Asn1TaggedObject) obj, false);
e.MoveNext();
digEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(e.Current);
}
else
{
authenticatedAttributes = null;
digEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(obj);
}
e.MoveNext();
encryptedDigest = DerOctetString.GetInstance(e.Current);
if (e.MoveNext())
{
unauthenticatedAttributes = Asn1Set.GetInstance((Asn1TaggedObject) e.Current, false);
}
else
{
unauthenticatedAttributes = null;
}
}
public DerInteger Version
{
get { return version; }
}
public SignerIdentifier SignerID
{
get { return sid; }
}
public Asn1Set AuthenticatedAttributes
{
get { return authenticatedAttributes; }
}
public AlgorithmIdentifier DigestAlgorithm
{
get { return digAlgorithm; }
}
public Asn1OctetString EncryptedDigest
{
get { return encryptedDigest; }
}
public AlgorithmIdentifier DigestEncryptionAlgorithm
{
get { return digEncryptionAlgorithm; }
}
public Asn1Set UnauthenticatedAttributes
{
get { return unauthenticatedAttributes; }
}
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* SignerInfo ::= Sequence {
* version Version,
* SignerIdentifier sid,
* digestAlgorithm DigestAlgorithmIdentifier,
* authenticatedAttributes [0] IMPLICIT Attributes OPTIONAL,
* digestEncryptionAlgorithm DigestEncryptionAlgorithmIdentifier,
* encryptedDigest EncryptedDigest,
* unauthenticatedAttributes [1] IMPLICIT Attributes OPTIONAL
* }
*
* EncryptedDigest ::= OCTET STRING
*
* DigestAlgorithmIdentifier ::= AlgorithmIdentifier
*
* DigestEncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(
version, sid, digAlgorithm);
if (authenticatedAttributes != null)
{
v.Add(new DerTaggedObject(false, 0, authenticatedAttributes));
}
v.Add(digEncryptionAlgorithm, encryptedDigest);
if (unauthenticatedAttributes != null)
{
v.Add(new DerTaggedObject(false, 1, unauthenticatedAttributes));
}
return new DerSequence(v);
}
}
}
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