From d6a3569addaf5a7db27dd3e79a4ba4bcd27c2486 Mon Sep 17 00:00:00 2001
From: Thomas Lenz <tlenz@iaik.tugraz.at>
Date: Tue, 8 Mar 2016 10:55:47 +0100
Subject: update mandate ReferenceValue generator. This was necessary to get a
 referencevalue, which is MIS conform and which could used as SAML2 RequestID

---
 .../java/at/gv/egovernment/moa/id/util/Random.java | 95 ++++++++++++++++++----
 1 file changed, 81 insertions(+), 14 deletions(-)

(limited to 'id/server/idserverlib/src/main/java/at/gv/egovernment/moa/id/util')

diff --git a/id/server/idserverlib/src/main/java/at/gv/egovernment/moa/id/util/Random.java b/id/server/idserverlib/src/main/java/at/gv/egovernment/moa/id/util/Random.java
index 22a021d99..07679999b 100644
--- a/id/server/idserverlib/src/main/java/at/gv/egovernment/moa/id/util/Random.java
+++ b/id/server/idserverlib/src/main/java/at/gv/egovernment/moa/id/util/Random.java
@@ -47,10 +47,17 @@
 package at.gv.egovernment.moa.id.util;
 
 
-import iaik.security.random.SeedGenerator;
-
 import java.nio.ByteBuffer;
 import java.security.SecureRandom;
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+import org.apache.commons.codec.binary.Hex;
+
+import com.google.common.primitives.Bytes;
+
+import iaik.security.random.SeedGenerator;
 
 
 /**
@@ -60,37 +67,97 @@ import java.security.SecureRandom;
  */
 public class Random {
 
+	
+	private final static char[] allowedPreFix = 
+		{'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
+		 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
+	private static final DateFormat dateFormater = new SimpleDateFormat("yyyyddMM");
+	
   /** random number generator used */
 	//private static SecureRandom random = new SecureRandom();
 	private static SecureRandom random;
-	private static SeedGenerator seedgenerator;
-	
+	private static SeedGenerator seedgenerator;	
+		
 	static {
 		random = iaik.security.random.SHA256FIPS186Random.getDefault();
 	    seedgenerator = iaik.security.random.AutoSeedGenerator.getDefault();
-
 		
 	}
+	
+	/**
+	 * Generate a unique process reference-value [160bit], which always starts with a letter
+	 * <br>
+	 * This unique ID consists of single letter, a 64bit date String[yyyyddMM],
+	 *  and a 88bit random value.  
+	 * 
+	 * @return 160bit ID, which is hex encoded
+	 */
+	public static String nextProcessReferenceValue() {		
+		//pre-process all three parts of a unique reference value
+		String now = dateFormater.format(new Date()); //8 bytes = 64bit
+		byte[] randValue = nextByteRandom(11);
+		char preFix = allowedPreFix[Math.abs(random.nextInt() % allowedPreFix.length)];
+	 
+		//generate ID
+		return preFix + new String(Hex.encodeHex(Bytes.concat(now.getBytes(), randValue), true)); // 20 bytes = 160 bits
+		
+	}
+	
+	
+	
+	/**
+	 * Creates a new random number [256bit], and encode it as hex value.
+	 * 
+	 * @return random hex encoded value [256bit]
+	 */
+	public static String nextHexRandom() {
+		return new String(Hex.encodeHex(nextByteRandom(32), true)); // 32 bytes = 256 bits
+		
+	}
+	
+	  /**
+	   * Creates a new random number [64bit], to be used as an ID.
+	   * 
+	   * @return random long as a String [64bit]
+	   */
+	public static String nextLongRandom() {	  
+		return "".concat(String.valueOf(Math.abs(generateLongRandom(32)))); // 32 bytes = 256 bits	
+			
+	  }
+		
   /**
    * Creates a new random number, to be used as an ID.
    * 
-   * @return random long as a String
+   * @return random long as a String [64bit]
    */
-  public static String nextRandom() {
-	  
-	byte[] b = new byte[32]; // 32 bytes = 256 bits
-	random.nextBytes(b);
-		 
-    ByteBuffer bb = ByteBuffer.wrap(b);
-	long l = bb.getLong();
+	@Deprecated
+  public static String nextRandom() {	  
+	long l = ByteBuffer.wrap(nextByteRandom(32)).getLong(); // 32 bytes = 256 bits
 	return "" + Math.abs(l);
 		
-
   }
   
+  
   public static void seedRandom() {
 	  
 	  if (seedgenerator.seedAvailable())
 		  random.setSeed(seedgenerator.getSeed());
+  }
+  
+	private static long generateLongRandom(int size) {
+		return ByteBuffer.wrap(nextByteRandom(size)).getLong(); 	
+	}
+  
+  /**
+   * Generate a new random number
+   * 
+   * @param size Size of random number in bits
+   * @return
+   */
+  private static byte[] nextByteRandom(int size) {
+	  byte[] b = new byte[size];
+	  random.nextBytes(b);			 
+	  return b;
+	  
   }
 }
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