1 files changed, 182 insertions, 0 deletions
diff --git a/Crypto/src/asn1/cms/AuthenticatedDataParser.cs b/Crypto/src/asn1/cms/AuthenticatedDataParser.cs
new file mode 100644
index 000000000..4b80d1b02
--- /dev/null
+++ b/Crypto/src/asn1/cms/AuthenticatedDataParser.cs
@@ -0,0 +1,182 @@
+using System;
+
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.Cms
+{
+ /**
+ * 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 class AuthenticatedDataParser
+ {
+ private Asn1SequenceParser seq;
+ private DerInteger version;
+ private IAsn1Convertible nextObject;
+ private bool originatorInfoCalled;
+
+ public AuthenticatedDataParser(
+ Asn1SequenceParser seq)
+ {
+ this.seq = seq;
+ this.version = (DerInteger)seq.ReadObject();
+ }
+
+ public DerInteger Version
+ {
+ get { return version; }
+ }
+
+ public OriginatorInfo GetOriginatorInfo()
+ {
+ originatorInfoCalled = true;
+
+ if (nextObject == null)
+ {
+ nextObject = seq.ReadObject();
+ }
+
+ if (nextObject is Asn1TaggedObjectParser && ((Asn1TaggedObjectParser)nextObject).TagNo == 0)
+ {
+ Asn1SequenceParser originatorInfo = (Asn1SequenceParser) ((Asn1TaggedObjectParser)nextObject).GetObjectParser(Asn1Tags.Sequence, false);
+ nextObject = null;
+ return OriginatorInfo.GetInstance(originatorInfo.ToAsn1Object());
+ }
+
+ return null;
+ }
+
+ public Asn1SetParser GetRecipientInfos()
+ {
+ if (!originatorInfoCalled)
+ {
+ GetOriginatorInfo();
+ }
+
+ if (nextObject == null)
+ {
+ nextObject = seq.ReadObject();
+ }
+
+ Asn1SetParser recipientInfos = (Asn1SetParser)nextObject;
+ nextObject = null;
+ return recipientInfos;
+ }
+
+ public AlgorithmIdentifier GetMacAlgorithm()
+ {
+ if (nextObject == null)
+ {
+ nextObject = seq.ReadObject();
+ }
+
+ if (nextObject != null)
+ {
+ Asn1SequenceParser o = (Asn1SequenceParser)nextObject;
+ nextObject = null;
+ return AlgorithmIdentifier.GetInstance(o.ToAsn1Object());
+ }
+
+ return null;
+ }
+
+ public AlgorithmIdentifier GetDigestAlgorithm()
+ {
+ if (nextObject == null)
+ {
+ nextObject = seq.ReadObject();
+ }
+
+ if (nextObject is Asn1TaggedObjectParser)
+ {
+ AlgorithmIdentifier obj = AlgorithmIdentifier.GetInstance(
+ (Asn1TaggedObject)nextObject.ToAsn1Object(), false);
+ nextObject = null;
+ return obj;
+ }
+
+ return null;
+ }
+
+ public ContentInfoParser GetEnapsulatedContentInfo()
+ {
+ if (nextObject == null)
+ {
+ nextObject = seq.ReadObject();
+ }
+
+ if (nextObject != null)
+ {
+ Asn1SequenceParser o = (Asn1SequenceParser)nextObject;
+ nextObject = null;
+ return new ContentInfoParser(o);
+ }
+
+ return null;
+ }
+
+ public Asn1SetParser GetAuthAttrs()
+ {
+ if (nextObject == null)
+ {
+ nextObject = seq.ReadObject();
+ }
+
+ if (nextObject is Asn1TaggedObjectParser)
+ {
+ IAsn1Convertible o = nextObject;
+ nextObject = null;
+ return (Asn1SetParser)((Asn1TaggedObjectParser)o).GetObjectParser(Asn1Tags.Set, false);
+ }
+
+ return null;
+ }
+
+ public Asn1OctetString GetMac()
+ {
+ if (nextObject == null)
+ {
+ nextObject = seq.ReadObject();
+ }
+
+ IAsn1Convertible o = nextObject;
+ nextObject = null;
+
+ return Asn1OctetString.GetInstance(o.ToAsn1Object());
+ }
+
+ public Asn1SetParser GetUnauthAttrs()
+ {
+ if (nextObject == null)
+ {
+ nextObject = seq.ReadObject();
+ }
+
+ if (nextObject != null)
+ {
+ IAsn1Convertible o = nextObject;
+ nextObject = null;
+ return (Asn1SetParser)((Asn1TaggedObjectParser)o).GetObjectParser(Asn1Tags.Set, false);
+ }
+
+ return null;
+ }
+ }
+}
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