From 1243b4acace365b0231aca22470517ae42c4ed1d Mon Sep 17 00:00:00 2001
From: J08nY
Date: Sat, 3 Nov 2018 00:02:02 +0100
Subject: Add compression tests for quadratic non-residue in modular square
 root.

---
 src/cz/crcs/ectester/common/util/ECUtil.java | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src/cz/crcs/ectester/common/util/ECUtil.java')

diff --git a/src/cz/crcs/ectester/common/util/ECUtil.java b/src/cz/crcs/ectester/common/util/ECUtil.java
index 6c3ad58..1706ca0 100644
--- a/src/cz/crcs/ectester/common/util/ECUtil.java
+++ b/src/cz/crcs/ectester/common/util/ECUtil.java
@@ -31,6 +31,14 @@ public class ECUtil {
         return raw;
     }
 
+    public static byte[] toX962Compressed(byte[][] point) {
+        if (point.length != 2) {
+            return null;
+        }
+        byte ybit = (byte) (point[1][point[1].length - 1] % 2);
+        return ByteUtil.concatenate(new byte[]{(byte) (0x02 | ybit)}, point[0]);
+    }
+
     public static byte[] toX962Compressed(ECPoint point, int bits) {
         if (point.equals(ECPoint.POINT_INFINITY)) {
             return new byte[]{0};
-- 
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