diff --git a/Crypto/src/asn1/pkcs/SignedData.cs b/Crypto/src/asn1/pkcs/SignedData.cs
new file mode 100644
index 000000000..10951d37a
--- /dev/null
+++ b/Crypto/src/asn1/pkcs/SignedData.cs
@@ -0,0 +1,163 @@
+using System;
+using System.Collections;
+
+using Org.BouncyCastle.Asn1;
+
+namespace Org.BouncyCastle.Asn1.Pkcs
+{
+ /**
+ * a Pkcs#7 signed data object.
+ */
+ public class SignedData
+ : Asn1Encodable
+ {
+ private readonly DerInteger version;
+ private readonly Asn1Set digestAlgorithms;
+ private readonly ContentInfo contentInfo;
+ private readonly Asn1Set certificates;
+ private readonly Asn1Set crls;
+ private readonly Asn1Set signerInfos;
+
+ public static SignedData GetInstance(
+ object obj)
+ {
+ if (obj is SignedData)
+ {
+ return (SignedData) obj;
+ }
+
+ if (obj is Asn1Sequence)
+ {
+ return new SignedData((Asn1Sequence) obj);
+ }
+
+ throw new ArgumentException("Unknown object in factory: " + obj.GetType().FullName, "obj");
+ }
+
+ public SignedData(
+ DerInteger _version,
+ Asn1Set _digestAlgorithms,
+ ContentInfo _contentInfo,
+ Asn1Set _certificates,
+ Asn1Set _crls,
+ Asn1Set _signerInfos)
+ {
+ version = _version;
+ digestAlgorithms = _digestAlgorithms;
+ contentInfo = _contentInfo;
+ certificates = _certificates;
+ crls = _crls;
+ signerInfos = _signerInfos;
+ }
+
+ private SignedData(
+ Asn1Sequence seq)
+ {
+ IEnumerator e = seq.GetEnumerator();
+
+ e.MoveNext();
+ version = (DerInteger) e.Current;
+
+ e.MoveNext();
+ digestAlgorithms = (Asn1Set) e.Current;
+
+ e.MoveNext();
+ contentInfo = ContentInfo.GetInstance(e.Current);
+
+ while (e.MoveNext())
+ {
+ Asn1Object o = (Asn1Object) e.Current;
+
+ //
+ // an interesting feature of SignedData is that there appear to be varying implementations...
+ // for the moment we ignore anything which doesn't fit.
+ //
+ if (o is DerTaggedObject)
+ {
+ DerTaggedObject tagged = (DerTaggedObject) o;
+
+ switch (tagged.TagNo)
+ {
+ case 0:
+ certificates = Asn1Set.GetInstance(tagged, false);
+ break;
+ case 1:
+ crls = Asn1Set.GetInstance(tagged, false);
+ break;
+ default:
+ throw new ArgumentException("unknown tag value " + tagged.TagNo);
+ }
+ }
+ else
+ {
+ signerInfos = (Asn1Set) o;
+ }
+ }
+ }
+
+ public DerInteger Version
+ {
+ get { return version; }
+ }
+
+ public Asn1Set DigestAlgorithms
+ {
+ get { return digestAlgorithms; }
+ }
+
+ public ContentInfo ContentInfo
+ {
+ get { return contentInfo; }
+ }
+
+ public Asn1Set Certificates
+ {
+ get { return certificates; }
+ }
+
+ public Asn1Set Crls
+ {
+ get { return crls; }
+ }
+
+ public Asn1Set SignerInfos
+ {
+ get { return signerInfos; }
+ }
+
+ /**
+ * Produce an object suitable for an Asn1OutputStream.
+ * <pre>
+ * SignedData ::= Sequence {
+ * version Version,
+ * digestAlgorithms DigestAlgorithmIdentifiers,
+ * contentInfo ContentInfo,
+ * certificates
+ * [0] IMPLICIT ExtendedCertificatesAndCertificates
+ * OPTIONAL,
+ * crls
+ * [1] IMPLICIT CertificateRevocationLists OPTIONAL,
+ * signerInfos SignerInfos }
+ * </pre>
+ */
+ public override Asn1Object ToAsn1Object()
+ {
+ Asn1EncodableVector v = new Asn1EncodableVector(
+ version, digestAlgorithms, contentInfo);
+
+ if (certificates != null)
+ {
+ v.Add(new DerTaggedObject(false, 0, certificates));
+ }
+
+ if (crls != null)
+ {
+ v.Add(new DerTaggedObject(false, 1, crls));
+ }
+
+ v.Add(signerInfos);
+
+ return new BerSequence(v);
+ }
+ }
+}
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