CmsAuthenticatedDataParser
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Cms;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;
using System.IO;
namespace Org.BouncyCastle.Cms
{
public class CmsAuthenticatedDataParser : CmsContentInfoParser
{
internal RecipientInformationStore _recipientInfoStore;
internal AuthenticatedDataParser authData;
private AlgorithmIdentifier macAlg;
private byte[] mac;
private Org.BouncyCastle.Asn1.Cms.AttributeTable authAttrs;
private Org.BouncyCastle.Asn1.Cms.AttributeTable unauthAttrs;
private bool authAttrNotRead;
private bool unauthAttrNotRead;
public AlgorithmIdentifier MacAlgorithmID => macAlg;
public string MacAlgOid => macAlg.Algorithm.Id;
public Asn1Object MacAlgParams => macAlg.Parameters?.ToAsn1Object();
public CmsAuthenticatedDataParser(byte[] envelopedData)
: this(new MemoryStream(envelopedData, false))
{
}
public CmsAuthenticatedDataParser(Stream envelopedData)
: base(envelopedData)
{
authAttrNotRead = true;
authData = new AuthenticatedDataParser((Asn1SequenceParser)contentInfo.GetContent(16));
Asn1Set instance = Asn1Set.GetInstance(authData.GetRecipientInfos().ToAsn1Object());
macAlg = authData.GetMacAlgorithm();
CmsReadable readable = new CmsProcessableInputStream(((Asn1OctetStringParser)authData.GetEnapsulatedContentInfo().GetContent(4)).GetOctetStream());
CmsSecureReadable secureReadable = new CmsEnvelopedHelper.CmsAuthenticatedSecureReadable(macAlg, readable);
_recipientInfoStore = CmsEnvelopedHelper.BuildRecipientInformationStore(instance, secureReadable);
}
public RecipientInformationStore GetRecipientInfos()
{
return _recipientInfoStore;
}
public byte[] GetMac()
{
if (mac == null) {
GetAuthAttrs();
mac = authData.GetMac().GetOctets();
}
return Arrays.Clone(mac);
}
public Org.BouncyCastle.Asn1.Cms.AttributeTable GetAuthAttrs()
{
if (authAttrs == null && authAttrNotRead) {
Asn1SetParser asn1SetParser = authData.GetAuthAttrs();
authAttrNotRead = false;
if (asn1SetParser != null)
authAttrs = CmsUtilities.ParseAttributeTable(asn1SetParser);
}
return authAttrs;
}
public Org.BouncyCastle.Asn1.Cms.AttributeTable GetUnauthAttrs()
{
if (unauthAttrs == null && unauthAttrNotRead) {
Asn1SetParser asn1SetParser = authData.GetUnauthAttrs();
unauthAttrNotRead = false;
if (asn1SetParser != null)
unauthAttrs = CmsUtilities.ParseAttributeTable(asn1SetParser);
}
return unauthAttrs;
}
}
}