1 files changed, 129 insertions, 0 deletions
diff --git a/src/main/java/com/lowagie/bc/asn1/DERInteger.java b/src/main/java/com/lowagie/bc/asn1/DERInteger.java
new file mode 100644
index 0000000..9df0d62
--- /dev/null
+++ b/src/main/java/com/lowagie/bc/asn1/DERInteger.java
@@ -0,0 +1,129 @@
+package com.lowagie.bc.asn1;
+
+import java.io.IOException;
+import java.math.BigInteger;
+
+public class DERInteger
+    extends DERObject
+{
+    byte[]      bytes;
+
+    /**
+     * return an integer from the passed in object
+     *
+     * @exception IllegalArgumentException if the object cannot be converted.
+     */
+    public static DERInteger getInstance(
+        Object  obj)
+    {
+        if (obj == null || obj instanceof DERInteger)
+        {
+            return (DERInteger)obj;
+        }
+
+        if (obj instanceof ASN1OctetString)
+        {
+            return new DERInteger(((ASN1OctetString)obj).getOctets());
+        }
+
+        if (obj instanceof ASN1TaggedObject)
+        {
+            return getInstance(((ASN1TaggedObject)obj).getObject());
+        }
+
+        throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
+    }
+
+    /**
+     * return an Integer from a tagged object.
+     *
+     * @param obj the tagged object holding the object we want
+     * @param explicit true if the object is meant to be explicitly
+     *              tagged false otherwise.
+     * @exception IllegalArgumentException if the tagged object cannot
+     *               be converted.
+     */
+    public static DERInteger getInstance(
+        ASN1TaggedObject obj,
+        boolean          explicit)
+    {
+        return getInstance(obj.getObject());
+    }
+
+    public DERInteger(
+        int         value)
+    {
+        bytes = BigInteger.valueOf(value).toByteArray();
+    }
+
+    public DERInteger(
+        BigInteger   value)
+    {
+        bytes = value.toByteArray();
+    }
+
+    public DERInteger(
+        byte[]   bytes)
+    {
+        this.bytes = bytes;
+    }
+
+    public BigInteger getValue()
+    {
+        return new BigInteger(bytes);
+    }
+
+    /**
+     * in some cases positive values get crammed into a space,
+     * that's not quite big enough...
+     */
+    public BigInteger getPositiveValue()
+    {
+        return new BigInteger(1, bytes);
+    }
+
+    void encode(
+        DEROutputStream out)
+        throws IOException
+    {
+        out.writeEncoded(INTEGER, bytes);
+    }
+    
+    public int hashCode()
+    {
+         int     value = 0;
+ 
+         for (int i = 0; i != bytes.length; i++)
+         {
+             value ^= (bytes[i] & 0xff) << (i % 4);
+         }
+ 
+         return value;
+    }
+
+    public boolean equals(
+        Object  o)
+    {
+        if (o == null || !(o instanceof DERInteger))
+        {
+            return false;
+        }
+
+        DERInteger other = (DERInteger)o;
+
+        if (bytes.length != other.bytes.length)
+        {
+            return false;
+        }
+
+        for (int i = 0; i != bytes.length; i++)
+        {
+            if (bytes[i] != other.bytes[i])
+            {
+                return false;
+            }
+        }
+
+        return true;
+    }
+}