KeyFactory Class

Definition

[Android.Runtime.Register("java/security/KeyFactory", DoNotGenerateAcw=true)]
public class KeyFactory : Java.Lang.Object

[<Android.Runtime.Register("java/security/KeyFactory", DoNotGenerateAcw=true)>]
type KeyFactory = class
    inherit Object

Inheritance

Object

Object

KeyFactory

Attributes

RegisterAttribute

Remarks

Key factories are used to convert keys (opaque cryptographic keys of type Key) into key specifications (transparent representations of the underlying key material), and vice versa.

Key factories are bi-directional. That is, they allow you to build an opaque key object from a given key specification (key material), or to retrieve the underlying key material of a key object in a suitable format.

Multiple compatible key specifications may exist for the same key. For example, a DSA public key may be specified using DSAPublicKeySpec or X509EncodedKeySpec. A key factory can be used to translate between compatible key specifications.

The following is an example of how to use a key factory in order to instantiate a DSA public key from its encoding. Assume Alice has received a digital signature from Bob. Bob also sent her his public key (in encoded format) to verify his signature. Alice then performs the following actions:

X509EncodedKeySpec bobPubKeySpec = new X509EncodedKeySpec(bobEncodedPubKey);
            KeyFactory keyFactory = KeyFactory.getInstance("DSA");
            PublicKey bobPubKey = keyFactory.generatePublic(bobPubKeySpec);
            Signature sig = Signature.getInstance("DSA");
            sig.initVerify(bobPubKey);
            sig.update(data);
            sig.verify(signature);

Android provides the following KeyFactory algorithms: <table> <thead> <tr> <th>Algorithm</th> <th>Supported API Levels</th> </tr> </thead> <tbody> <tr> <td>DH</td> <td>1+</td> </tr> <tr> <td>DSA</td> <td>1+</td> </tr> <tr> <td>EC</td> <td>11+</td> </tr> <tr> <td>RSA</td> <td>1+</td> </tr> <tr class="deprecated"> <td>X.509</td> <td>1-8</td> </tr> </tbody> </table>

Added in 1.2.

Java documentation for java.security.KeyFactory.

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

Constructors

Properties

Methods

Explicit Interface Implementations

Extension Methods

Applies to