1 files changed, 188 insertions, 0 deletions
diff --git a/src/main/java/com/lowagie/bc/asn1/DERGeneralizedTime.java b/src/main/java/com/lowagie/bc/asn1/DERGeneralizedTime.java
new file mode 100644
index 0000000..28cab51
--- /dev/null
+++ b/src/main/java/com/lowagie/bc/asn1/DERGeneralizedTime.java
@@ -0,0 +1,188 @@
+package com.lowagie.bc.asn1;
+
+import java.io.IOException;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.SimpleTimeZone;
+
+/**
+ * Generalized time object.
+ */
+public class DERGeneralizedTime
+    extends DERObject
+{
+    String      time;
+
+    /**
+     * return a generalized time from the passed in object
+     *
+     * @exception IllegalArgumentException if the object cannot be converted.
+     */
+    public static DERGeneralizedTime getInstance(
+        Object  obj)
+    {
+        if (obj == null || obj instanceof DERGeneralizedTime)
+        {
+            return (DERGeneralizedTime)obj;
+        }
+
+        if (obj instanceof ASN1OctetString)
+        {
+            return new DERGeneralizedTime(((ASN1OctetString)obj).getOctets());
+        }
+
+        throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
+    }
+
+    /**
+     * return a Generalized Time object 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 DERGeneralizedTime getInstance(
+        ASN1TaggedObject obj,
+        boolean          explicit)
+    {
+        return getInstance(obj.getObject());
+    }
+    
+    /**
+     * The correct format for this is YYYYMMDDHHMMSSZ, or without the Z
+     * for local time, or Z+-HHMM on the end, for difference between local
+     * time and UTC time.
+     * <p>
+     *
+     * @param time the time string.
+     */
+    public DERGeneralizedTime(
+        String  time)
+    {
+        this.time = time;
+    }
+
+    /**
+     * base constructer from a java.util.date object
+     */
+    public DERGeneralizedTime(
+        Date time)
+    {
+        SimpleDateFormat dateF = new SimpleDateFormat("yyyyMMddHHmmss'Z'");
+
+        dateF.setTimeZone(new SimpleTimeZone(0,"Z"));
+
+        this.time = dateF.format(time);
+    }
+
+    DERGeneralizedTime(
+        byte[]  bytes)
+    {
+        //
+        // explicitly convert to characters
+        //
+        char[]  dateC = new char[bytes.length];
+
+        for (int i = 0; i != dateC.length; i++)
+        {
+            dateC[i] = (char)(bytes[i] & 0xff);
+        }
+
+        this.time = new String(dateC);
+    }
+
+    /**
+     * return the time - always in the form of 
+     *  YYYYMMDDhhmmssGMT(+hh:mm|-hh:mm).
+     * <p>
+     * Normally in a certificate we would expect "Z" rather than "GMT",
+     * however adding the "GMT" means we can just use:
+     * <pre>
+     *     dateF = new SimpleDateFormat("yyyyMMddHHmmssz");
+     * </pre>
+     * To read in the time and get a date which is compatible with our local
+     * time zone.
+     */
+    public String getTime()
+    {
+        //
+        // standardise the format.
+        //             
+        if (time.charAt(time.length() - 1) == 'Z')
+        {
+            return time.substring(0, time.length() - 1) + "GMT+00:00";
+        }
+        else
+        {
+            int signPos = time.length() - 5;
+            char sign = time.charAt(signPos);
+            if (sign == '-' || sign == '+')
+            {
+                return time.substring(0, signPos)
+                    + "GMT"
+                    + time.substring(signPos, signPos + 3)
+                    + ":"
+                    + time.substring(signPos + 3);
+            }
+            else
+            {
+                signPos = time.length() - 3;
+                sign = time.charAt(signPos);
+                if (sign == '-' || sign == '+')
+                {
+                    return time.substring(0, signPos)
+                        + "GMT"
+                        + time.substring(signPos)
+                        + ":00";
+                }
+            }
+        }            
+
+        return time;
+    }
+
+    public Date getDate() 
+    	throws ParseException
+    {
+        SimpleDateFormat dateF = new SimpleDateFormat("yyyyMMddHHmmss'Z'");
+        
+        dateF.setTimeZone(new SimpleTimeZone(0, "Z"));
+        
+        return dateF.parse(time);
+    }
+    
+    private byte[] getOctets()
+    {
+        char[]  cs = time.toCharArray();
+        byte[]  bs = new byte[cs.length];
+
+        for (int i = 0; i != cs.length; i++)
+        {
+            bs[i] = (byte)cs[i];
+        }
+
+        return bs;
+    }
+
+
+    void encode(
+        DEROutputStream  out)
+        throws IOException
+    {
+        out.writeEncoded(GENERALIZED_TIME, this.getOctets());
+    }
+    
+    public boolean equals(
+        Object  o)
+    {
+        if ((o == null) || !(o instanceof DERGeneralizedTime))
+        {
+            return false;
+        }
+
+        return time.equals(((DERGeneralizedTime)o).time);
+    }
+}