Initial import of old CVS repository

1 files changed, 48 insertions, 0 deletions

diff --git a/crypto/src/asn1/x9/X9IntegerConverter.cs b/crypto/src/asn1/x9/X9IntegerConverter.cs
new file mode 100644
index 000000000..2bce20488
--- /dev/null
+++ b/crypto/src/asn1/x9/X9IntegerConverter.cs
@@ -0,0 +1,48 @@
+using System;
+
+using Org.BouncyCastle.Math;
+using Org.BouncyCastle.Math.EC;
+
+namespace Org.BouncyCastle.Asn1.X9
+{
+    public sealed class X9IntegerConverter
+    {
+		private X9IntegerConverter()
+		{
+		}
+
+		public static int GetByteLength(
+            ECFieldElement fe)
+        {
+			return (fe.FieldSize + 7) / 8;
+        }
+
+		public static int GetByteLength(
+			ECCurve c)
+		{
+			return (c.FieldSize + 7) / 8;
+		}
+
+		public static byte[] IntegerToBytes(
+			BigInteger	s,
+			int			qLength)
+		{
+			byte[] bytes = s.ToByteArrayUnsigned();
+
+			if (qLength < bytes.Length)
+			{
+				byte[] tmp = new byte[qLength];
+				Array.Copy(bytes, bytes.Length - tmp.Length, tmp, 0, tmp.Length);
+				return tmp;
+			}
+			else if (qLength > bytes.Length)
+			{
+				byte[] tmp = new byte[qLength];
+				Array.Copy(bytes, 0, tmp, tmp.Length - bytes.Length, bytes.Length);
+				return tmp;
+			}
+
+			return bytes;
+		}
+    }
+}