1 files changed, 50 insertions, 0 deletions
diff --git a/pkix/src/main/java/org/spongycastle/cms/KeyTransRecipientInformation.java b/pkix/src/main/java/org/spongycastle/cms/KeyTransRecipientInformation.java
new file mode 100644
index 00000000..f671b8cd
--- /dev/null
+++ b/pkix/src/main/java/org/spongycastle/cms/KeyTransRecipientInformation.java
@@ -0,0 +1,50 @@
+package org.spongycastle.cms;
+
+import org.spongycastle.asn1.ASN1OctetString;
+import org.spongycastle.asn1.cms.IssuerAndSerialNumber;
+import org.spongycastle.asn1.cms.KeyTransRecipientInfo;
+import org.spongycastle.asn1.cms.RecipientIdentifier;
+import org.spongycastle.asn1.x509.AlgorithmIdentifier;
+
+/**
+ * the KeyTransRecipientInformation class for a recipient who has been sent a secret
+ * key encrypted using their public key that needs to be used to
+ * extract the message.
+ */
+public class KeyTransRecipientInformation
+    extends RecipientInformation
+{
+    private KeyTransRecipientInfo info;
+
+    KeyTransRecipientInformation(
+        KeyTransRecipientInfo   info,
+        AlgorithmIdentifier     messageAlgorithm,
+        CMSSecureReadable       secureReadable,
+        AuthAttributesProvider  additionalData)
+    {
+        super(info.getKeyEncryptionAlgorithm(), messageAlgorithm, secureReadable, additionalData);
+
+        this.info = info;
+
+        RecipientIdentifier r = info.getRecipientIdentifier();
+
+        if (r.isTagged())
+        {
+            ASN1OctetString octs = ASN1OctetString.getInstance(r.getId());
+
+            rid = new KeyTransRecipientId(octs.getOctets());
+        }
+        else
+        {
+            IssuerAndSerialNumber   iAnds = IssuerAndSerialNumber.getInstance(r.getId());
+
+            rid = new KeyTransRecipientId(iAnds.getName(), iAnds.getSerialNumber().getValue());
+        }
+    }
+
+    protected RecipientOperator getRecipientOperator(Recipient recipient)
+        throws CMSException
+    {
+        return ((KeyTransRecipient)recipient).getRecipientOperator(keyEncAlg, messageAlgorithm, info.getEncryptedKey().getOctets());
+    }
+}