1 files changed, 79 insertions, 0 deletions
diff --git a/Crypto/src/asn1/x509/KeyUsage.cs b/Crypto/src/asn1/x509/KeyUsage.cs
new file mode 100644
index 000000000..fef04e8b9
--- /dev/null
+++ b/Crypto/src/asn1/x509/KeyUsage.cs
@@ -0,0 +1,79 @@
+namespace Org.BouncyCastle.Asn1.X509
+{
+ /**
+ * The KeyUsage object.
+ * <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 KeyUsage
+ : DerBitString
+ {
+ 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);
+
+ public static new KeyUsage GetInstance(
+ object obj)
+ {
+ if (obj is KeyUsage)
+ {
+ return (KeyUsage)obj;
+ }
+
+ if (obj is X509Extension)
+ {
+ return GetInstance(X509Extension.ConvertValueToObject((X509Extension) obj));
+ }
+
+ return new KeyUsage(DerBitString.GetInstance(obj));
+ }
+
+ /**
+ * Basic constructor.
+ *
+ * @param usage - the bitwise OR of the Key Usage flags giving the
+ * allowed uses for the key.
+ * e.g. (KeyUsage.keyEncipherment | KeyUsage.dataEncipherment)
+ */
+ public KeyUsage(
+ int usage)
+ : base(GetBytes(usage), GetPadBits(usage))
+ {
+ }
+
+ private KeyUsage(
+ DerBitString usage)
+ : base(usage.GetBytes(), usage.PadBits)
+ {
+ }
+
+ public override string ToString()
+ {
+ byte[] data = GetBytes();
+ if (data.Length == 1)
+ {
+ return "KeyUsage: 0x" + (data[0] & 0xff).ToString("X");
+ }
+
+ return "KeyUsage: 0x" + ((data[1] & 0xff) << 8 | (data[0] & 0xff)).ToString("X");
+ }
+ }
+}
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