1 files changed, 92 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/asn1/x509/DSAParameter.java b/core/src/main/java/org/spongycastle/asn1/x509/DSAParameter.java
new file mode 100644
index 00000000..1b6b2405
--- /dev/null
+++ b/core/src/main/java/org/spongycastle/asn1/x509/DSAParameter.java
@@ -0,0 +1,92 @@
+package org.spongycastle.asn1.x509;
+
+import java.math.BigInteger;
+import java.util.Enumeration;
+
+import org.spongycastle.asn1.ASN1EncodableVector;
+import org.spongycastle.asn1.ASN1Integer;
+import org.spongycastle.asn1.ASN1Object;
+import org.spongycastle.asn1.ASN1Primitive;
+import org.spongycastle.asn1.ASN1Sequence;
+import org.spongycastle.asn1.ASN1TaggedObject;
+import org.spongycastle.asn1.DERSequence;
+
+public class DSAParameter
+    extends ASN1Object
+{
+    ASN1Integer      p, q, g;
+
+    public static DSAParameter getInstance(
+        ASN1TaggedObject obj,
+        boolean          explicit)
+    {
+        return getInstance(ASN1Sequence.getInstance(obj, explicit));
+    }
+
+    public static DSAParameter getInstance(
+        Object obj)
+    {
+        if (obj instanceof DSAParameter)
+        {
+            return (DSAParameter)obj;
+        }
+        
+        if(obj != null)
+        {
+            return new DSAParameter(ASN1Sequence.getInstance(obj));
+        }
+        
+        return null;
+    }
+
+    public DSAParameter(
+        BigInteger  p,
+        BigInteger  q,
+        BigInteger  g)
+    {
+        this.p = new ASN1Integer(p);
+        this.q = new ASN1Integer(q);
+        this.g = new ASN1Integer(g);
+    }
+
+    private DSAParameter(
+        ASN1Sequence  seq)
+    {
+        if (seq.size() != 3)
+        {
+            throw new IllegalArgumentException("Bad sequence size: " + seq.size());
+        }
+        
+        Enumeration     e = seq.getObjects();
+
+        p = ASN1Integer.getInstance(e.nextElement());
+        q = ASN1Integer.getInstance(e.nextElement());
+        g = ASN1Integer.getInstance(e.nextElement());
+    }
+
+    public BigInteger getP()
+    {
+        return p.getPositiveValue();
+    }
+
+    public BigInteger getQ()
+    {
+        return q.getPositiveValue();
+    }
+
+    public BigInteger getG()
+    {
+        return g.getPositiveValue();
+    }
+
+    public ASN1Primitive toASN1Primitive()
+    {
+        ASN1EncodableVector  v = new ASN1EncodableVector();
+
+        v.add(p);
+        v.add(q);
+        v.add(g);
+
+        return new DERSequence(v);
+    }
+}