From b8054933b3d07ef8bfc3bec56b2bb795c1d01e5e Mon Sep 17 00:00:00 2001
From: J08nY
Date: Wed, 7 Aug 2024 13:02:34 +0200
Subject: Add support for deterministic PRNG to SunEC and BouncyCastle.

---
 .../java/cz/crcs/ectester/common/util/Util.java    | 23 +++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

(limited to 'common')

diff --git a/common/src/main/java/cz/crcs/ectester/common/util/Util.java b/common/src/main/java/cz/crcs/ectester/common/util/Util.java
index 5b0cd79..9e6daa2 100644
--- a/common/src/main/java/cz/crcs/ectester/common/util/Util.java
+++ b/common/src/main/java/cz/crcs/ectester/common/util/Util.java
@@ -1,5 +1,8 @@
 package cz.crcs.ectester.common.util;
 
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+
 /**
  * @author Jan Jancar johny@neuromancer.sk
  */
@@ -18,11 +21,25 @@ public class Util {
 
     public static int getVersion() {
         String version = System.getProperty("java.version");
-        if(version.startsWith("1.")) {
+        if (version.startsWith("1.")) {
             version = version.substring(2, 3);
         } else {
             int dot = version.indexOf(".");
-            if(dot != -1) { version = version.substring(0, dot); }
-        } return Integer.parseInt(version);
+            if (dot != -1) {
+                version = version.substring(0, dot);
+            }
+        }
+        return Integer.parseInt(version);
+    }
+
+    public static SecureRandom getRandom(byte[] seed) {
+        SecureRandom random;
+        try {
+            random = SecureRandom.getInstance("DRBG");
+        } catch (NoSuchAlgorithmException ignored) {
+            return null;
+        }
+        random.setSeed(seed);
+        return random;
     }
 }
-- 
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