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;
+ }
+ }
+}
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