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package org.spongycastle.asn1.x509;
import org.spongycastle.asn1.ASN1Object;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.DERBitString;
/**
* 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
extends ASN1Object
{
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);
private DERBitString bitString;
public static KeyUsage getInstance(Object obj) // needs to be DERBitString for other VMs
{
if (obj instanceof KeyUsage)
{
return (KeyUsage)obj;
}
else if (obj != null)
{
return new KeyUsage(DERBitString.getInstance(obj));
}
return null;
}
public static KeyUsage fromExtensions(Extensions extensions)
{
return KeyUsage.getInstance(extensions.getExtensionParsedValue(Extension.keyUsage));
}
/**
* 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)
{
this.bitString = new DERBitString(usage);
}
private KeyUsage(
DERBitString bitString)
{
this.bitString = bitString;
}
/**
* Return true if a given usage bit is set, false otherwise.
*
* @param usages combination of usage flags.
* @return true if all bits are set, false otherwise.
*/
public boolean hasUsages(int usages)
{
return (bitString.intValue() & usages) == usages;
}
public byte[] getBytes()
{
return bitString.getBytes();
}
public int getPadBits()
{
return bitString.getPadBits();
}
public String toString()
{
byte[] data = bitString.getBytes();
if (data.length == 1)
{
return "KeyUsage: 0x" + Integer.toHexString(data[0] & 0xff);
}
return "KeyUsage: 0x" + Integer.toHexString((data[1] & 0xff) << 8 | (data[0] & 0xff));
}
public ASN1Primitive toASN1Primitive()
{
return bitString;
}
}
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