1 files changed, 47 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/x9/X9IntegerConverter.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/x9/X9IntegerConverter.java
new file mode 100644
index 000000000..66dcc59b1
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/x9/X9IntegerConverter.java
@@ -0,0 +1,47 @@
+package org.spongycastle.asn1.x9;
+
+import java.math.BigInteger;
+
+import org.spongycastle.math.ec.ECCurve;
+import org.spongycastle.math.ec.ECFieldElement;
+
+public class X9IntegerConverter
+{
+    public int getByteLength(
+        ECCurve c)
+    {
+        return (c.getFieldSize() + 7) / 8;
+    }
+
+    public int getByteLength(
+        ECFieldElement fe)
+    {
+        return (fe.getFieldSize() + 7) / 8;
+    }
+
+    public byte[] integerToBytes(
+        BigInteger s,
+        int        qLength)
+    {
+        byte[] bytes = s.toByteArray();
+        
+        if (qLength < bytes.length)
+        {
+            byte[] tmp = new byte[qLength];
+        
+            System.arraycopy(bytes, bytes.length - tmp.length, tmp, 0, tmp.length);
+            
+            return tmp;
+        }
+        else if (qLength > bytes.length)
+        {
+            byte[] tmp = new byte[qLength];
+        
+            System.arraycopy(bytes, 0, tmp, tmp.length - bytes.length, bytes.length);
+            
+            return tmp; 
+        }
+    
+        return bytes;
+    }
+}