1 files changed, 122 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/cms/Attribute.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/cms/Attribute.java
new file mode 100644
index 000000000..292303a03
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/cms/Attribute.java
@@ -0,0 +1,122 @@
+package org.spongycastle.asn1.cms;
+
+import org.spongycastle.asn1.ASN1Encodable;
+import org.spongycastle.asn1.ASN1EncodableVector;
+import org.spongycastle.asn1.ASN1Object;
+import org.spongycastle.asn1.ASN1ObjectIdentifier;
+import org.spongycastle.asn1.ASN1Primitive;
+import org.spongycastle.asn1.ASN1Sequence;
+import org.spongycastle.asn1.ASN1Set;
+import org.spongycastle.asn1.DERObjectIdentifier;
+import org.spongycastle.asn1.DERSequence;
+
+/**
+ * <a href="http://tools.ietf.org/html/rfc5652#page-14">RFC 5652</a>:
+ * Attribute is a pair of OID (as type identifier) + set of values.
+ * <p>
+ * <pre>
+ * Attribute ::= SEQUENCE {
+ *     attrType OBJECT IDENTIFIER,
+ *     attrValues SET OF AttributeValue
+ * }
+ * 
+ * AttributeValue ::= ANY
+ * </pre>
+ * <p>
+ * General rule on values is that same AttributeValue must not be included
+ * multiple times into the set. That is, if the value is a SET OF INTEGERs,
+ * then having same value repeated is wrong: (1, 1), but different values is OK: (1, 2).
+ * Normally the AttributeValue syntaxes are more complicated than that.
+ * <p>
+ * General rule of Attribute usage is that the {@link Attributes} containers
+ * must not have multiple Attribute:s with same attrType (OID) there.
+ */
+public class Attribute
+    extends ASN1Object
+{
+    private ASN1ObjectIdentifier attrType;
+    private ASN1Set             attrValues;
+
+    /**
+     * Return an Attribute object from the given object.
+     * <p>
+     * Accepted inputs:
+     * <ul>
+     * <li> null &rarr; null
+     * <li> {@link Attribute} object
+     * <li> {@link org.spongycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with Attribute structure inside
+     * </ul>
+     *
+     * @param o the object we want converted.
+     * @exception IllegalArgumentException if the object cannot be converted.
+     */
+    public static Attribute getInstance(
+        Object o)
+    {
+        if (o instanceof Attribute)
+        {
+            return (Attribute)o;
+        }
+        
+        if (o != null)
+        {
+            return new Attribute(ASN1Sequence.getInstance(o));
+        }
+
+        return null;
+    }
+    
+    private Attribute(
+        ASN1Sequence seq)
+    {
+        attrType = (ASN1ObjectIdentifier)seq.getObjectAt(0);
+        attrValues = (ASN1Set)seq.getObjectAt(1);
+    }
+
+    /**
+     * @deprecated use ASN1ObjectIdentifier
+     */
+    public Attribute(
+        DERObjectIdentifier attrType,
+        ASN1Set             attrValues)
+    {
+        this.attrType = new ASN1ObjectIdentifier(attrType.getId());
+        this.attrValues = attrValues;
+    }
+
+    public Attribute(
+        ASN1ObjectIdentifier attrType,
+        ASN1Set             attrValues)
+    {
+        this.attrType = attrType;
+        this.attrValues = attrValues;
+    }
+
+    public ASN1ObjectIdentifier getAttrType()
+    {
+        return attrType;
+    }
+    
+    public ASN1Set getAttrValues()
+    {
+        return attrValues;
+    }
+
+    public ASN1Encodable[] getAttributeValues()
+    {
+        return attrValues.toArray();
+    }
+
+    /** 
+     * Produce an object suitable for an ASN1OutputStream.
+     */
+    public ASN1Primitive toASN1Primitive()
+    {
+        ASN1EncodableVector v = new ASN1EncodableVector();
+
+        v.add(attrType);
+        v.add(attrValues);
+
+        return new DERSequence(v);
+    }
+}