Blackberry Java Development Environment 4.6.0 Manuel - Page 28

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Cryptographic Smart Card Driver Development Guide

Code sample: Enabling a CryptoToken object for RSA

operations using a private key

Example: MyRSACryptoToken.java

/**

* MyRSACryptoToken.java

package com.rim.samples.device.smartcard;

import net.rim.device.api.smartcard.*;

import net.rim.device.api.crypto.*;

import net.rim.device.api.crypto.keystore.*;

import net.rim.device.api.util.*;

import net.rim.device.api.crypto.certificate.x509.*;

import net.rim.device.api.crypto.certificate.*;

import net.rim.device.api.crypto.asn1.*;

import net.rim.device.api.compress.*;

import net.rim.device.api.i18n.*;

/**

* This class describes an implmentation of an RSA cryptographic token.

* The RIM Crypto API will use this object to perform a private key RSA operation.

* This object should delegate the operation to the smart card.

final class MyRSACryptoToken extends RSACryptoToken implements Persistable

{

private static final String DECRYPT_DESC = "The private key will be used to decrypt

encrypted data.";

private static final String SIGN_DESC = "The private key will be used to generate a

digital signature.";

/**

* Constructs a new MyRSACryptoToken object.

MyRSACryptoToken()

{

}

/**

* Determine if this token does the user authentication for the system.

* If not the KeyStore will prompt for the key store password when the user

* tries to access the private key.

* @return True if this token will prompt for the necessary

* user authentication when private key access is requested.

public boolean providesUserAuthentication()

{

return true;

}