1 files changed, 102 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/asn1/cms/CCMParameters.java b/core/src/main/java/org/spongycastle/asn1/cms/CCMParameters.java
new file mode 100644
index 00000000..1c505449
--- /dev/null
+++ b/core/src/main/java/org/spongycastle/asn1/cms/CCMParameters.java
@@ -0,0 +1,102 @@
+package org.spongycastle.asn1.cms;
+
+import org.spongycastle.asn1.ASN1EncodableVector;
+import org.spongycastle.asn1.ASN1Integer;
+import org.spongycastle.asn1.ASN1Object;
+import org.spongycastle.asn1.ASN1OctetString;
+import org.spongycastle.asn1.ASN1Primitive;
+import org.spongycastle.asn1.ASN1Sequence;
+import org.spongycastle.asn1.DEROctetString;
+import org.spongycastle.asn1.DERSequence;
+import org.spongycastle.util.Arrays;
+
+/**
+ * <a href="http://tools.ietf.org/html/rfc5084">RFC 5084</a>: CCMParameters object.
+ * <p>
+ * <pre>
+ CCMParameters ::= SEQUENCE {
+   aes-nonce        OCTET STRING, -- recommended size is 12 octets
+   aes-ICVlen       AES-CCM-ICVlen DEFAULT 12 }
+ * </pre>
+ */
+public class CCMParameters
+    extends ASN1Object
+{
+    private byte[] nonce;
+    private int icvLen;
+
+    /**
+     * Return an CCMParameters object from the given object.
+     * <p>
+     * Accepted inputs:
+     * <ul>
+     * <li> null &rarr; null
+     * <li> {@link org.spongycastle.asn1.cms.CCMParameters} object
+     * <li> {@link org.spongycastle.asn1.ASN1Sequence#getInstance(Object) ASN1Sequence} input formats with CCMParameters structure inside
+     * </ul>
+     *
+     * @param obj the object we want converted.
+     * @exception IllegalArgumentException if the object cannot be converted.
+     */
+    public static CCMParameters getInstance(
+        Object  obj)
+    {
+        if (obj instanceof CCMParameters)
+        {
+            return (CCMParameters)obj;
+        }
+        else if (obj != null)
+        {
+            return new CCMParameters(ASN1Sequence.getInstance(obj));
+        }
+
+        return null;
+    }
+
+    private CCMParameters(
+        ASN1Sequence seq)
+    {
+        this.nonce = ASN1OctetString.getInstance(seq.getObjectAt(0)).getOctets();
+
+        if (seq.size() == 2)
+        {
+            this.icvLen = ASN1Integer.getInstance(seq.getObjectAt(1)).getValue().intValue();
+        }
+        else
+        {
+            this.icvLen = 12;
+        }
+    }
+
+    public CCMParameters(
+        byte[] nonce,
+        int icvLen)
+    {
+        this.nonce = Arrays.clone(nonce);
+        this.icvLen = icvLen;
+    }
+
+    public byte[] getNonce()
+    {
+        return Arrays.clone(nonce);
+    }
+
+    public int getIcvLen()
+    {
+        return icvLen;
+    }
+
+    public ASN1Primitive toASN1Primitive()
+    {
+        ASN1EncodableVector    v = new ASN1EncodableVector();
+
+        v.add(new DEROctetString(nonce));
+
+        if (icvLen != 12)
+        {
+            v.add(new ASN1Integer(icvLen));
+        }
+
+        return new DERSequence(v);
+    }
+}