SHOW Signed

net.rim.device.api.crypto.encoder
Class SymmetricKeyEncoder

java.lang.Object
  |
  +--net.rim.device.api.crypto.encoder.SymmetricKeyEncoder

public abstract class SymmetricKeyEncoder
extends Object

Allows the developer to encode symmetric keys using a variety of supported encoding algorithms. Once again, the details of creating and using the appropriate algorithm are managed by SymmetricKeyDecoder and are completely transparent to the developer.

Encoding a Symmetric Key

Encoding a public key involves calling the public static encode() method with the desired symmetric key. As the following code illustrates, encoding a is straightforward:

      DESKey key = new DESKey( ... );
      EncodedKey encodedKey = SymmetricKeyEncoder.encode( key, "scheme" );
 
Of course, the DES key must be properly created and initialized.

Decoding a Symmetric Key

Decoding a symmetric key is similar to encoding one. Simply call the public static decode() method with the encoded key:

      byte[] encodedKeyData = ...;
      SymmetricKey decodedKey = SymmetricKeyDecoder.decode( encodedKey, "scheme" );
 
This code assumes that encodedKey contains a properly encoded symmetric key.

Supported Encoding Algorithms

A complete list of the key encoding algorithms supported by the RIM crypto API can be found here. Currently, RIM provides the following symmetric key encoding algorithms, which can be accessed with the specifed string :

A RIM variant of PKCS8 Use the encoding string "PKCS8".

For algorithms not found in this list, a developer can implement additional symmetric key decoding algorithms that can be integrated into the Crypto API. Please see the tutorial on Adding Encoders.

Category:
Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

Since:
JDE 3.6.0

Constructor Summary
 
Method Summary
 Category: Signed static EncodedKey encode(SymmetricKey key)
          Encodes the given key using the default PKCS8 encoding scheme.
 Category: Signed static EncodedKey encode(SymmetricKey key, String encodingAlgorithm)
          Encodes a given key using the specified encoding scheme.
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail
Method Detail

encode

public static EncodedKey encode(SymmetricKey key)
                         throws NoSuchAlgorithmException,
                                CryptoTokenException,
                                CryptoUnsupportedOperationException
Encodes the given key using the default PKCS8 encoding scheme.

Parameters:
key - The symmetric key to encode.
Returns:
An EncodedKey object containing the encoded key.
Throws:
NoSuchAlgorithmException - Thrown if the encoding algorithm cannot be found.
CryptoTokenException - Thrown if an error occurs with the crypto token or the crypto token is invalid.
CryptoUnsupportedOperationException - Thrown if a call is made to an unsupported operation.
Since:
JDE 4.0.2
Category:
Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

encode

public static EncodedKey encode(SymmetricKey key,
                                String encodingAlgorithm)
                         throws NoSuchAlgorithmException,
                                CryptoTokenException,
                                CryptoUnsupportedOperationException
Encodes a given key using the specified encoding scheme.

Parameters:
key - The symmetric key to encode.
encodingAlgorithm - A String representing the encoding Algorithm to use, eg "PKCS8".
Returns:
An EncodedKey object containing the encoded key.
Throws:
NoSuchAlgorithmException - Thrown if the specified encoding algorithm cannot be found.
CryptoTokenException - Thrown if an error occurs with the crypto token or the crypto token is invalid.
CryptoUnsupportedOperationException - Thrown if a call is made to an unsupported operation.
Since:
JDE 4.0.2
Category:
Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.


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