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using System;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Asn1.Cms
{
public class AuthenticatedData
: Asn1Encodable
{
public static AuthenticatedData GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is AuthenticatedData authenticatedData)
return authenticatedData;
return new AuthenticatedData(Asn1Sequence.GetInstance(obj));
}
public static AuthenticatedData GetInstance(Asn1TaggedObject obj, bool isExplicit)
{
return new AuthenticatedData(Asn1Sequence.GetInstance(obj, isExplicit));
}
private readonly DerInteger m_version;
private readonly OriginatorInfo m_originatorInfo;
private readonly Asn1Set m_recipientInfos;
private readonly AlgorithmIdentifier m_macAlgorithm;
private readonly AlgorithmIdentifier m_digestAlgorithm;
private readonly ContentInfo m_encapsulatedContentInfo;
private readonly Asn1Set m_authAttrs;
private readonly Asn1OctetString m_mac;
private readonly Asn1Set m_unauthAttrs;
public AuthenticatedData(OriginatorInfo originatorInfo, Asn1Set recipientInfos,
AlgorithmIdentifier macAlgorithm, AlgorithmIdentifier digestAlgorithm, ContentInfo encapsulatedContent,
Asn1Set authAttrs, Asn1OctetString mac, Asn1Set unauthAttrs)
{
if ((digestAlgorithm == null) != (authAttrs == null))
throw new ArgumentException("digestAlgorithm and authAttrs must be set together");
m_version = CalculateVersionField(originatorInfo);
m_originatorInfo = originatorInfo;
m_macAlgorithm = macAlgorithm ?? throw new ArgumentNullException(nameof(macAlgorithm));
m_digestAlgorithm = digestAlgorithm;
m_recipientInfos = recipientInfos ?? throw new ArgumentNullException(nameof(recipientInfos));
m_encapsulatedContentInfo = encapsulatedContent ?? throw new ArgumentNullException(nameof(encapsulatedContent));
m_authAttrs = authAttrs;
m_mac = mac ?? throw new ArgumentNullException(nameof(mac));
m_unauthAttrs = unauthAttrs;
}
private AuthenticatedData(Asn1Sequence seq)
{
int count = seq.Count, pos = 0;
if (count < 5 || count > 9)
throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
m_version = DerInteger.GetInstance(seq[pos++]);
m_originatorInfo = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 0, false, OriginatorInfo.GetInstance);
m_recipientInfos = Asn1Set.GetInstance(seq[pos++]);
m_macAlgorithm = AlgorithmIdentifier.GetInstance(seq[pos++]);
m_digestAlgorithm = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 1, false, AlgorithmIdentifier.GetInstance);
m_encapsulatedContentInfo = ContentInfo.GetInstance(seq[pos++]);
m_authAttrs = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 2, false, Asn1Set.GetInstance);
m_mac = Asn1OctetString.GetInstance(seq[pos++]);
m_unauthAttrs = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 3, false, Asn1Set.GetInstance);
if (pos != count)
throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
}
public DerInteger Version => m_version;
public OriginatorInfo OriginatorInfo => m_originatorInfo;
public Asn1Set RecipientInfos => m_recipientInfos;
public AlgorithmIdentifier MacAlgorithm => m_macAlgorithm;
public AlgorithmIdentifier DigestAlgorithm => m_digestAlgorithm;
public ContentInfo EncapsulatedContentInfo => m_encapsulatedContentInfo;
public Asn1Set AuthAttrs => m_authAttrs;
public Asn1OctetString Mac => m_mac;
public Asn1Set UnauthAttrs => m_unauthAttrs;
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* AuthenticatedData ::= SEQUENCE {
* version CMSVersion,
* originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
* recipientInfos RecipientInfos,
* macAlgorithm MessageAuthenticationCodeAlgorithm,
* digestAlgorithm [1] DigestAlgorithmIdentifier OPTIONAL,
* encapContentInfo EncapsulatedContentInfo,
* authAttrs [2] IMPLICIT AuthAttributes OPTIONAL,
* mac MessageAuthenticationCode,
* unauthAttrs [3] IMPLICIT UnauthAttributes OPTIONAL }
*
* AuthAttributes ::= SET SIZE (1..MAX) OF Attribute
*
* UnauthAttributes ::= SET SIZE (1..MAX) OF Attribute
*
* MessageAuthenticationCode ::= OCTET STRING
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(9);
v.Add(m_version);
v.AddOptionalTagged(false, 0, m_originatorInfo);
v.Add(m_recipientInfos, m_macAlgorithm);
v.AddOptionalTagged(false, 1, m_digestAlgorithm);
v.Add(m_encapsulatedContentInfo);
v.AddOptionalTagged(false, 2, m_authAttrs);
v.Add(m_mac);
v.AddOptionalTagged(false, 3, m_unauthAttrs);
return new BerSequence(v);
}
public static int CalculateVersion(OriginatorInfo origInfo) => CalculateVersionField(origInfo).IntValueExact;
private static DerInteger CalculateVersionField(OriginatorInfo originatorInfo)
{
/*
* IF (originatorInfo is present) AND
* ((any certificates with a type of other are present) OR
* (any crls with a type of other are present))
* THEN version is 3
* ELSE
* IF ((originatorInfo is present) AND
* (any version 2 attribute certificates are present))
* THEN version is 1
* ELSE version is 0
*/
if (originatorInfo != null)
{
var crls = originatorInfo.Crls;
if (crls != null)
{
foreach (var element in crls)
{
var tagged = Asn1TaggedObject.GetOptional(element);
if (tagged != null)
{
// RevocationInfoChoice.other
if (tagged.HasContextTag(1))
return DerInteger.Three;
}
}
}
var certs = originatorInfo.Certificates;
if (certs != null)
{
bool anyV2AttrCerts = false;
foreach (var element in certs)
{
var tagged = Asn1TaggedObject.GetOptional(element);
if (tagged != null)
{
// CertificateChoices.other
if (tagged.HasContextTag(3))
return DerInteger.Three;
// CertificateChoices.v2AttrCert
anyV2AttrCerts = anyV2AttrCerts || tagged.HasContextTag(2);
}
}
if (anyV2AttrCerts)
return DerInteger.One;
}
}
return DerInteger.Zero;
}
}
}
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