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## org.bouncycastle.asn1.x509
Class ExtendedKeyUsage

    java.lang.Object
      org.bouncycastle.asn1.ASN1Object
          org.bouncycastle.asn1.x509.ExtendedKeyUsage

All Implemented Interfaces:
  ASN1Encodable, Encodable

public class ExtendedKeyUsage
extends ASN1Object

The extendedKeyUsage object. extendedKeyUsage ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId

Constructor Summary
`ExtendedKeyUsage(KeyPurposeId usage)` Base constructor, from a single KeyPurposeId.
`ExtendedKeyUsage(KeyPurposeId[] usages)` Base constructor, from multiple KeyPurposeIds.
`ExtendedKeyUsage(java.util.Vector usages)` Deprecated. use KeyPurposeId[] constructor.

Method Summary
`static ExtendedKeyUsage` | `fromExtensions(Extensions extensions)` Retrieve an ExtendedKeyUsage for a passed in Extensions object, if present.
`static ExtendedKeyUsage` | `getInstance(ASN1TaggedObject obj, boolean explicit)` Return an ExtendedKeyUsage from the passed in tagged object.
`static ExtendedKeyUsage` | `getInstance(java.lang.Object obj)` Return an ExtendedKeyUsage from the passed in object.
`KeyPurposeId[]` | `getUsages()` Returns all extended key usages.
`boolean` | `hasKeyPurposeId(KeyPurposeId keyPurposeId)` Return true if this ExtendedKeyUsage object contains the passed in keyPurposeId.
`int` | `size()` Return the number of KeyPurposeIds present in this ExtendedKeyUsage.
`ASN1Primitive` | `toASN1Primitive()` Return the ASN.1 primitive form of this object.

Methods inherited from class org.bouncycastle.asn1.ASN1Object
`encodeTo, encodeTo, equals, getEncoded, getEncoded, hasEncodedTagValue, hashCode`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### ExtendedKeyUsage

    public ExtendedKeyUsage(KeyPurposeId usage)

  Base constructor, from a single KeyPurposeId.

Parameters:
  `usage` - the keyPurposeId to be included.

### ExtendedKeyUsage

    public ExtendedKeyUsage(KeyPurposeId[] usages)

  Base constructor, from multiple KeyPurposeIds.

Parameters:
  `usages` - an array of KeyPurposeIds.

### ExtendedKeyUsage

    public ExtendedKeyUsage(java.util.Vector usages)

  Deprecated. use KeyPurposeId[] constructor.

Method Detail

### getInstance

    public static ExtendedKeyUsage getInstance(ASN1TaggedObject obj,
                                               boolean explicit)

  Return an ExtendedKeyUsage from the passed in tagged object.

  Parameters:
    `obj` - the tagged object containing the ExtendedKeyUsage
    `explicit` - true if the tagged object should be interpreted as explicitly tagged, false if implicit.
  Returns:
    the ExtendedKeyUsage contained.

### getInstance

    public static ExtendedKeyUsage getInstance(java.lang.Object obj)

  Return an ExtendedKeyUsage from the passed in object.

  Parameters:
    `obj` - an ExtendedKeyUsage, some form or encoding of one, or null.
  Returns:
    an ExtendedKeyUsage object, or null if null is passed in.

### fromExtensions

    public static ExtendedKeyUsage fromExtensions(Extensions extensions)

  Retrieve an ExtendedKeyUsage for a passed in Extensions object, if present.

  Parameters:
    `extensions` - the extensions object to be examined.
  Returns:
    the ExtendedKeyUsage, null if the extension is not present.

### hasKeyPurposeId

    public boolean hasKeyPurposeId(KeyPurposeId keyPurposeId)

  Return true if this ExtendedKeyUsage object contains the passed in keyPurposeId.

  Parameters:
    `keyPurposeId` - the KeyPurposeId of interest.
  Returns:
    true if the keyPurposeId is present, false otherwise.

### getUsages

    public KeyPurposeId[] getUsages()

  Returns all extended key usages.

  Returns:
    An array with all key purposes.

### size

    public int size()

  Return the number of KeyPurposeIds present in this ExtendedKeyUsage.

  Returns:
    the number of KeyPurposeIds

### toASN1Primitive

    public ASN1Primitive toASN1Primitive()

  Return the ASN.1 primitive form of this object.

  Specified by:
    `toASN1Primitive` in interface `ASN1Encodable`
  Specified by:
    `toASN1Primitive` in class `ASN1Object`
  Returns:
    an ASN1Sequence.

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