1 files changed, 59 insertions, 0 deletions
diff --git a/Crypto/src/x509/X509KeyUsage.cs b/Crypto/src/x509/X509KeyUsage.cs
new file mode 100644
index 000000000..e0a7b4939
--- /dev/null
+++ b/Crypto/src/x509/X509KeyUsage.cs
@@ -0,0 +1,59 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.X509
+{
+ /**
+ * A holding class for constructing an X509 Key Usage extension.
+ *
+ * <pre>
+ * id-ce-keyUsage OBJECT IDENTIFIER ::= { id-ce 15 }
+ *
+ * KeyUsage ::= BIT STRING {
+ * digitalSignature (0),
+ * nonRepudiation (1),
+ * keyEncipherment (2),
+ * dataEncipherment (3),
+ * keyAgreement (4),
+ * keyCertSign (5),
+ * cRLSign (6),
+ * encipherOnly (7),
+ * decipherOnly (8) }
+ * </pre>
+ */
+ public class X509KeyUsage
+ : Asn1Encodable
+ {
+ public const int DigitalSignature = 1 << 7;
+ public const int NonRepudiation = 1 << 6;
+ public const int KeyEncipherment = 1 << 5;
+ public const int DataEncipherment = 1 << 4;
+ public const int KeyAgreement = 1 << 3;
+ public const int KeyCertSign = 1 << 2;
+ public const int CrlSign = 1 << 1;
+ public const int EncipherOnly = 1 << 0;
+ public const int DecipherOnly = 1 << 15;
+
+ private readonly int usage;
+
+ /**
+ * Basic constructor.
+ *
+ * @param usage - the bitwise OR of the Key Usage flags giving the
+ * allowed uses for the key.
+ * e.g. (X509KeyUsage.keyEncipherment | X509KeyUsage.dataEncipherment)
+ */
+ public X509KeyUsage(
+ int usage)
+ {
+ this.usage = usage;
+ }
+
+ public override Asn1Object ToAsn1Object()
+ {
+ return new KeyUsage(usage);
+ }
+ }
+}
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