1 files changed, 99 insertions, 0 deletions
diff --git a/Crypto/src/asn1/cms/KeyTransRecipientInfo.cs b/Crypto/src/asn1/cms/KeyTransRecipientInfo.cs
new file mode 100644
index 000000000..aae18c59d
--- /dev/null
+++ b/Crypto/src/asn1/cms/KeyTransRecipientInfo.cs
@@ -0,0 +1,99 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.Cms
+{
+ public class KeyTransRecipientInfo
+ : Asn1Encodable
+ {
+ private DerInteger version;
+ private RecipientIdentifier rid;
+ private AlgorithmIdentifier keyEncryptionAlgorithm;
+ private Asn1OctetString encryptedKey;
+
+ public KeyTransRecipientInfo(
+ RecipientIdentifier rid,
+ AlgorithmIdentifier keyEncryptionAlgorithm,
+ Asn1OctetString encryptedKey)
+ {
+ if (rid.ToAsn1Object() is Asn1TaggedObject)
+ {
+ this.version = new DerInteger(2);
+ }
+ else
+ {
+ this.version = new DerInteger(0);
+ }
+
+ this.rid = rid;
+ this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
+ this.encryptedKey = encryptedKey;
+ }
+
+ public KeyTransRecipientInfo(
+ Asn1Sequence seq)
+ {
+ this.version = (DerInteger) seq[0];
+ this.rid = RecipientIdentifier.GetInstance(seq[1]);
+ this.keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[2]);
+ this.encryptedKey = (Asn1OctetString) seq[3];
+ }
+
+ /**
+ * return a KeyTransRecipientInfo object from the given object.
+ *
+ * @param obj the object we want converted.
+ * @exception ArgumentException if the object cannot be converted.
+ */
+ public static KeyTransRecipientInfo GetInstance(
+ object obj)
+ {
+ if (obj == null || obj is KeyTransRecipientInfo)
+ return (KeyTransRecipientInfo) obj;
+
+ if(obj is Asn1Sequence)
+ return new KeyTransRecipientInfo((Asn1Sequence) obj);
+
+ throw new ArgumentException(
+ "Illegal object in KeyTransRecipientInfo: " + obj.GetType().Name);
+ }
+
+ public DerInteger Version
+ {
+ get { return version; }
+ }
+
+ public RecipientIdentifier RecipientIdentifier
+ {
+ get { return rid; }
+ }
+
+ public AlgorithmIdentifier KeyEncryptionAlgorithm
+ {
+ get { return keyEncryptionAlgorithm; }
+ }
+
+ public Asn1OctetString EncryptedKey
+ {
+ get { return encryptedKey; }
+ }
+
+ /**
+ * Produce an object suitable for an Asn1OutputStream.
+ * <pre>
+ * KeyTransRecipientInfo ::= Sequence {
+ * version CMSVersion, -- always set to 0 or 2
+ * rid RecipientIdentifier,
+ * keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
+ * encryptedKey EncryptedKey
+ * }
+ * </pre>
+ */
+ public override Asn1Object ToAsn1Object()
+ {
+ return new DerSequence(version, rid, keyEncryptionAlgorithm, encryptedKey);
+ }
+ }
+}
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