1 files changed, 48 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/asn1/smime/SMIMEEncryptionKeyPreferenceAttribute.java b/core/src/main/java/org/spongycastle/asn1/smime/SMIMEEncryptionKeyPreferenceAttribute.java
new file mode 100644
index 00000000..2eacdee9
--- /dev/null
+++ b/core/src/main/java/org/spongycastle/asn1/smime/SMIMEEncryptionKeyPreferenceAttribute.java
@@ -0,0 +1,48 @@
+package org.spongycastle.asn1.smime;
+
+import org.spongycastle.asn1.ASN1OctetString;
+import org.spongycastle.asn1.DERSet;
+import org.spongycastle.asn1.DERTaggedObject;
+import org.spongycastle.asn1.cms.Attribute;
+import org.spongycastle.asn1.cms.IssuerAndSerialNumber;
+import org.spongycastle.asn1.cms.RecipientKeyIdentifier;
+
+/**
+ * The SMIMEEncryptionKeyPreference object.
+ * <pre>
+ * SMIMEEncryptionKeyPreference ::= CHOICE {
+ *     issuerAndSerialNumber   [0] IssuerAndSerialNumber,
+ *     receipentKeyId          [1] RecipientKeyIdentifier,
+ *     subjectAltKeyIdentifier [2] SubjectKeyIdentifier
+ * }
+ * </pre>
+ */
+public class SMIMEEncryptionKeyPreferenceAttribute
+    extends Attribute
+{
+    public SMIMEEncryptionKeyPreferenceAttribute(
+        IssuerAndSerialNumber issAndSer)
+    {
+        super(SMIMEAttributes.encrypKeyPref,
+                new DERSet(new DERTaggedObject(false, 0, issAndSer)));
+    }
+    
+    public SMIMEEncryptionKeyPreferenceAttribute(
+        RecipientKeyIdentifier rKeyId)
+    {
+
+        super(SMIMEAttributes.encrypKeyPref, 
+                    new DERSet(new DERTaggedObject(false, 1, rKeyId)));
+    }
+    
+    /**
+     * @param sKeyId the subjectKeyIdentifier value (normally the X.509 one)
+     */
+    public SMIMEEncryptionKeyPreferenceAttribute(
+        ASN1OctetString sKeyId)
+    {
+
+        super(SMIMEAttributes.encrypKeyPref,
+                    new DERSet(new DERTaggedObject(false, 2, sKeyId)));
+    }
+}