1 files changed, 148 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/asn1/x509/AlgorithmIdentifier.java b/core/src/main/java/org/spongycastle/asn1/x509/AlgorithmIdentifier.java
new file mode 100644
index 00000000..f5797250
--- /dev/null
+++ b/core/src/main/java/org/spongycastle/asn1/x509/AlgorithmIdentifier.java
@@ -0,0 +1,148 @@
+package org.spongycastle.asn1.x509;
+
+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.ASN1TaggedObject;
+import org.spongycastle.asn1.DERNull;
+import org.spongycastle.asn1.DERSequence;
+
+public class AlgorithmIdentifier
+    extends ASN1Object
+{
+    private ASN1ObjectIdentifier objectId;
+    private ASN1Encodable       parameters;
+    private boolean             parametersDefined = false;
+
+    public static AlgorithmIdentifier getInstance(
+        ASN1TaggedObject obj,
+        boolean          explicit)
+    {
+        return getInstance(ASN1Sequence.getInstance(obj, explicit));
+    }
+    
+    public static AlgorithmIdentifier getInstance(
+        Object  obj)
+    {
+        if (obj== null || obj instanceof AlgorithmIdentifier)
+        {
+            return (AlgorithmIdentifier)obj;
+        }
+
+        // TODO: delete
+        if (obj instanceof ASN1ObjectIdentifier)
+        {
+            return new AlgorithmIdentifier((ASN1ObjectIdentifier)obj);
+        }
+
+        // TODO: delete
+        if (obj instanceof String)
+        {
+            return new AlgorithmIdentifier((String)obj);
+        }
+
+        return new AlgorithmIdentifier(ASN1Sequence.getInstance(obj));
+    }
+
+    public AlgorithmIdentifier(
+        ASN1ObjectIdentifier     objectId)
+    {
+        this.objectId = objectId;
+    }
+
+    /**
+     * @deprecated use ASN1ObjectIdentifier
+     * @param objectId
+     */
+    public AlgorithmIdentifier(
+        String     objectId)
+    {
+        this.objectId = new ASN1ObjectIdentifier(objectId);
+    }
+
+    public AlgorithmIdentifier(
+        ASN1ObjectIdentifier     objectId,
+        ASN1Encodable           parameters)
+    {
+        parametersDefined = true;
+        this.objectId = objectId;
+        this.parameters = parameters;
+    }
+
+    /**
+     * @deprecated use AlgorithmIdentifier.getInstance()
+     * @param seq
+     */
+    public AlgorithmIdentifier(
+        ASN1Sequence   seq)
+    {
+        if (seq.size() < 1 || seq.size() > 2)
+        {
+            throw new IllegalArgumentException("Bad sequence size: "
+                    + seq.size());
+        }
+        
+        objectId = ASN1ObjectIdentifier.getInstance(seq.getObjectAt(0));
+
+        if (seq.size() == 2)
+        {
+            parametersDefined = true;
+            parameters = seq.getObjectAt(1);
+        }
+        else
+        {
+            parameters = null;
+        }
+    }
+
+    public ASN1ObjectIdentifier getAlgorithm()
+    {
+        return new ASN1ObjectIdentifier(objectId.getId());
+    }
+
+    /**
+     * @deprecated use getAlgorithm
+     * @return
+     */
+    public ASN1ObjectIdentifier getObjectId()
+    {
+        return objectId;
+    }
+
+    public ASN1Encodable getParameters()
+    {
+        return parameters;
+    }
+
+    /**
+     * Produce an object suitable for an ASN1OutputStream.
+     * <pre>
+     *      AlgorithmIdentifier ::= SEQUENCE {
+     *                            algorithm OBJECT IDENTIFIER,
+     *                            parameters ANY DEFINED BY algorithm OPTIONAL }
+     * </pre>
+     */
+    public ASN1Primitive toASN1Primitive()
+    {
+        ASN1EncodableVector  v = new ASN1EncodableVector();
+
+        v.add(objectId);
+
+        if (parametersDefined)
+        {
+            if (parameters != null)
+            {
+                v.add(parameters);
+            }
+            else
+            {
+                v.add(DERNull.INSTANCE);
+            }
+        }
+
+        return new DERSequence(v);
+    }
+}