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## javax.xml.crypto.dsig.keyinfo
Interface KeyInfo

All Superinterfaces:
  XMLStructure

    public interface KeyInfo

extends XMLStructure

A representation of the XML `KeyInfo` element as defined in the W3C Recommendation for XML-Signature Syntax and Processing. A `KeyInfo` contains a list of `XMLStructure`s, each of which contain information that enables the recipient(s) to obtain the key needed to validate an XML signature. The XML Schema Definition is defined as:

     <element name="KeyInfo" type="ds:KeyInfoType"/>
     <complexType name="KeyInfoType" mixed="true">
       <choice maxOccurs="unbounded">
         <element ref="ds:KeyName"/>
         <element ref="ds:KeyValue"/>
         <element ref="ds:RetrievalMethod"/>
         <element ref="ds:X509Data"/>
         <element ref="ds:PGPData"/>
         <element ref="ds:SPKIData"/>
         <element ref="ds:MgmtData"/>
         <any processContents="lax" namespace="##other"/>
         <!-- (1,1) elements from (0,unbounded) namespaces -->
       </choice>
       <attribute name="Id" type="ID" use="optional"/>
     </complexType>

A `KeyInfo` instance may be created by invoking one of the `newKeyInfo` methods of the `KeyInfoFactory` class, and passing it a list of one or more `XMLStructure`s and an optional id parameter; for example:

       KeyInfoFactory factory = KeyInfoFactory.getInstance("DOM");
       KeyInfo keyInfo = factory.newKeyInfo
            (Collections.singletonList(factory.newKeyName("Alice"), "keyinfo-1"));

`KeyInfo` objects can also be marshalled to XML by invoking the `marshal` method.

Author:
  Sean Mullan, JSR 105 Expert Group
See Also:
  `KeyInfoFactory.newKeyInfo(List)`, `KeyInfoFactory.newKeyInfo(List, String)`

Method Summary
`java.util.List` | `getContent()` Returns an `unmodifiable list` containing the key information.
`java.lang.String` | `getId()` Return the optional Id attribute of this `KeyInfo`, which may be useful for referencing this `KeyInfo` from other XML structures.
`void` | `marshal(XMLStructure parent, XMLCryptoContext context)` Marshals the key info to XML.

Methods inherited from interface javax.xml.crypto.XMLStructure
`isFeatureSupported`

Method Detail

### getContent

    java.util.List getContent()

  Returns an `unmodifiable list` containing the key information. Each entry of the list is an `XMLStructure`.

  If there is a public subclass representing the type of `XMLStructure`, it is returned as an instance of that class (ex: an `X509Data` element would be returned as an instance of `X509Data`).

  Returns:
    an unmodifiable list of one or more `XMLStructure`s in this `KeyInfo`. Never returns `null` or an empty list.

### getId

    java.lang.String getId()

  Return the optional Id attribute of this `KeyInfo`, which may be useful for referencing this `KeyInfo` from other XML structures.

  Returns:
    the Id attribute of this `KeyInfo` (may be `null` if not specified)

### marshal

    void marshal(XMLStructure parent,
                 XMLCryptoContext context)
                 throws MarshalException

  Marshals the key info to XML.

  Parameters:
    `parent` - a mechanism-specific structure containing the parent node that the marshalled key info will be appended to
    `context` - the `XMLCryptoContext` containing additional context (may be null if not applicable)
  Throws:
    `java.lang.ClassCastException` - if the type of `parent` or `context` is not compatible with this key info
    `MarshalException` - if the key info cannot be marshalled
    `java.lang.NullPointerException` - if `parent` is `null`

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