2002/03/21 01:19:32

[org.ibex.core.git] / src / org / bouncycastle / asn1 / x509 / KeyUsage.java

diff --git a/src/org/bouncycastle/asn1/x509/KeyUsage.java b/src/org/bouncycastle/asn1/x509/KeyUsage.java
new file mode 100644 (file)
index 0000000..e4ed284
--- /dev/null
+++ b/src/org/bouncycastle/asn1/x509/KeyUsage.java
@@ -0,0 +1,68 @@
+package org.bouncycastle.asn1.x509;
+
+import org.bouncycastle.asn1.*;
+
+/**
+ * <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
+    extends DERBitString
+{
+    public static final int        digitalSignature = (1 << 7); 
+    public static final int        nonRepudiation   = (1 << 6);
+    public static final int        keyEncipherment  = (1 << 5);
+    public static final int        dataEncipherment = (1 << 4);
+    public static final int        keyAgreement     = (1 << 3);
+    public static final int        keyCertSign      = (1 << 2);
+    public static final int        cRLSign          = (1 << 1);
+    public static final int        encipherOnly     = (1 << 0);
+    public static final int        decipherOnly     = (1 << 15);
+
+    static private byte[] getUsageBytes(
+        int usage)
+    {
+        byte[]  usageBytes = new byte[2];
+
+        usageBytes[0] = (byte)(usage & 0xFF);
+        usageBytes[1] = (byte)((usage >> 8) & 0xFF);
+
+        return usageBytes;
+    }
+
+    /**
+     * 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 KeyUsage(
+        int usage)
+    {
+        super(getUsageBytes(usage), 7);
+    }
+
+    public KeyUsage(
+        DERBitString usage)
+    {
+        super(usage.getBytes(), usage.getPadBits());
+    }
+
+    public String toString()
+    {
+        return "KeyUsage: 0x" + Integer.toHexString(data[0] & 0xff);
+    }
+}