1 files changed, 117 insertions, 0 deletions
diff --git a/Crypto/src/asn1/DerInteger.cs b/Crypto/src/asn1/DerInteger.cs
new file mode 100644
index 000000000..eb0614515
--- /dev/null
+++ b/Crypto/src/asn1/DerInteger.cs
@@ -0,0 +1,117 @@
+using System;
+
+using Org.BouncyCastle.Math;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Asn1
+{
+ public class DerInteger
+ : Asn1Object
+ {
+ private readonly byte[] bytes;
+
+ /**
+ * return an integer from the passed in object
+ *
+ * @exception ArgumentException if the object cannot be converted.
+ */
+ public static DerInteger GetInstance(
+ object obj)
+ {
+ if (obj == null || obj is DerInteger)
+ {
+ return (DerInteger)obj;
+ }
+
+ throw new ArgumentException("illegal object in GetInstance: " + obj.GetType().Name);
+ }
+
+ /**
+ * return an Integer from a tagged object.
+ *
+ * @param obj the tagged object holding the object we want
+ * @param isExplicit true if the object is meant to be explicitly
+ * tagged false otherwise.
+ * @exception ArgumentException if the tagged object cannot
+ * be converted.
+ */
+ public static DerInteger GetInstance(
+ Asn1TaggedObject obj,
+ bool isExplicit)
+ {
+ if (obj == null)
+ throw new ArgumentNullException("obj");
+
+ Asn1Object o = obj.GetObject();
+
+ if (isExplicit || o is DerInteger)
+ {
+ return GetInstance(o);
+ }
+
+ return new DerInteger(Asn1OctetString.GetInstance(o).GetOctets());
+ }
+
+ public DerInteger(
+ int value)
+ {
+ bytes = BigInteger.ValueOf(value).ToByteArray();
+ }
+
+ public DerInteger(
+ BigInteger value)
+ {
+ if (value == null)
+ throw new ArgumentNullException("value");
+
+ bytes = value.ToByteArray();
+ }
+
+ public DerInteger(
+ byte[] bytes)
+ {
+ this.bytes = bytes;
+ }
+
+ public BigInteger Value
+ {
+ get { return new BigInteger(bytes); }
+ }
+
+ /**
+ * in some cases positive values Get crammed into a space,
+ * that's not quite big enough...
+ */
+ public BigInteger PositiveValue
+ {
+ get { return new BigInteger(1, bytes); }
+ }
+
+ internal override void Encode(
+ DerOutputStream derOut)
+ {
+ derOut.WriteEncoded(Asn1Tags.Integer, bytes);
+ }
+
+ protected override int Asn1GetHashCode()
+ {
+ return Arrays.GetHashCode(bytes);
+ }
+
+ protected override bool Asn1Equals(
+ Asn1Object asn1Object)
+ {
+ DerInteger other = asn1Object as DerInteger;
+
+ if (other == null)
+ return false;
+
+ return Arrays.AreEqual(this.bytes, other.bytes);
+ }
+
+ public override string ToString()
+ {
+ return Value.ToString();
+ }
+ }
+}
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