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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));
if (obj == null)
return null;
return new KeyUsage(DerBitString.GetInstance(obj));
}
public static KeyUsage FromExtensions(X509Extensions extensions)
{
return GetInstance(X509Extensions.GetExtensionParsedValue(extensions, X509Extensions.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)
: base(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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