1 files changed, 116 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/cms/KeyAgreeRecipientIdentifier.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/cms/KeyAgreeRecipientIdentifier.java
new file mode 100644
index 000000000..f3de2bc1a
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/cms/KeyAgreeRecipientIdentifier.java
@@ -0,0 +1,116 @@
+package org.spongycastle.asn1.cms;
+
+import org.spongycastle.asn1.ASN1Choice;
+import org.spongycastle.asn1.ASN1Object;
+import org.spongycastle.asn1.ASN1Primitive;
+import org.spongycastle.asn1.ASN1Sequence;
+import org.spongycastle.asn1.ASN1TaggedObject;
+import org.spongycastle.asn1.DERTaggedObject;
+
+/**
+ * <a href="http://tools.ietf.org/html/rfc5652#section-6.2.2">RFC 5652</a>:
+ * Content encryption key delivery mechanisms.
+ * <p>
+ * <pre>
+ * KeyAgreeRecipientIdentifier ::= CHOICE {
+ *     issuerAndSerialNumber IssuerAndSerialNumber,
+ *     rKeyId [0] IMPLICIT RecipientKeyIdentifier }
+ * </pre>
+ */
+public class KeyAgreeRecipientIdentifier
+    extends ASN1Object
+    implements ASN1Choice
+{
+    private IssuerAndSerialNumber issuerSerial;
+    private RecipientKeyIdentifier rKeyID;
+
+    /**
+     * Return an KeyAgreeRecipientIdentifier object from a tagged object.
+     *
+     * @param obj the tagged object holding the object we want.
+     * @param explicit true if the object is meant to be explicitly
+     *              tagged false otherwise.
+     * @exception IllegalArgumentException if the object held by the
+     *          tagged object cannot be converted.
+     */
+    public static KeyAgreeRecipientIdentifier getInstance(
+        ASN1TaggedObject    obj,
+        boolean             explicit)
+    {
+        return getInstance(ASN1Sequence.getInstance(obj, explicit));
+    }
+    
+    /**
+     * Return an KeyAgreeRecipientIdentifier object from the given object.
+     * <p>
+     * Accepted inputs:
+     * <ul>
+     * <li> {@link KeyAgreeRecipientIdentifier} object
+     * <li> {@link org.spongycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with IssuerAndSerialNumber structure inside
+     * <li> {@link org.spongycastle.asn1.ASN1TaggedObject#getInstance(java.lang.Object) ASN1TaggedObject} with tag value 0: a KeyAgreeRecipientIdentifier data structure
+     * </ul>
+     * <p>
+     * Note: no byte[] input!
+     *
+     * @param obj the object we want converted.
+     * @exception IllegalArgumentException if the object cannot be converted.
+     */
+    public static KeyAgreeRecipientIdentifier getInstance(
+        Object obj)
+    {
+        if (obj == null || obj instanceof KeyAgreeRecipientIdentifier)
+        {
+            return (KeyAgreeRecipientIdentifier)obj;
+        }
+        
+        if (obj instanceof ASN1Sequence)
+        {
+            return new KeyAgreeRecipientIdentifier(IssuerAndSerialNumber.getInstance(obj));
+        }
+        
+        if (obj instanceof ASN1TaggedObject && ((ASN1TaggedObject)obj).getTagNo() == 0)
+        {
+            return new KeyAgreeRecipientIdentifier(RecipientKeyIdentifier.getInstance(
+                (ASN1TaggedObject)obj, false));
+        }
+        
+        throw new IllegalArgumentException("Invalid KeyAgreeRecipientIdentifier: " + obj.getClass().getName());
+    } 
+
+    public KeyAgreeRecipientIdentifier(
+        IssuerAndSerialNumber issuerSerial)
+    {
+        this.issuerSerial = issuerSerial;
+        this.rKeyID = null;
+    }
+
+    public KeyAgreeRecipientIdentifier(
+         RecipientKeyIdentifier rKeyID)
+    {
+        this.issuerSerial = null;
+        this.rKeyID = rKeyID;
+    }
+
+    public IssuerAndSerialNumber getIssuerAndSerialNumber()
+    {
+        return issuerSerial;
+    }
+
+    public RecipientKeyIdentifier getRKeyID()
+    {
+        return rKeyID;
+    }
+
+    /** 
+     * Produce an object suitable for an ASN1OutputStream.
+     */
+    public ASN1Primitive toASN1Primitive()
+    {
+        if (issuerSerial != null)
+        {
+            return issuerSerial.toASN1Primitive();
+        }
+
+        return new DERTaggedObject(false, 0, rKeyID);
+    }
+}