SignatureProxy.java

/*
 * Copyright 2015 Licel Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.licel.jcardsim.crypto;

import javacard.security.CryptoException;
import javacard.security.Signature;

/**
 * ProxyClass for <code>Signature</code>
 * @see Signature
 */
public class SignatureProxy {
    /**
     * Creates a <code>Signature</code> object instance of the selected algorithm.
     * @param algorithm the desired Signature algorithm. Valid codes listed in
     * ALG_ .. constants above e.g. <A HREF="../../javacard/security/Signature.html#ALG_DES_MAC4_NOPAD"><CODE>ALG_DES_MAC4_NOPAD</CODE></A>
     * @param externalAccess <code>true</code> indicates that the instance will be shared among
     * multiple applet instances and that the <code>Signature</code> instance will also be accessed (via a <code>Shareable</code>
     * interface) when the owner of the <code>Signature</code> instance is not the currently selected applet.
     * If <code>true</code> the implementation must not allocate CLEAR_ON_DESELECT transient space for internal data.
     * @return the <code>Signature</code> object instance of the requested algorithm
     * @throws CryptoException with the following reason codes:<ul>
     * <li><code>CryptoException.NO_SUCH_ALGORITHM</code> if the requested algorithm
     * or shared access mode is not supported.</ul>
     */
    public static final Signature getInstance(byte algorithm, boolean externalAccess)
            throws CryptoException {
        Signature instance = null;
        if (externalAccess) {
            CryptoException.throwIt(CryptoException.NO_SUCH_ALGORITHM);
        }
        switch (algorithm) {
            case Signature.ALG_RSA_SHA_ISO9796:
            case Signature.ALG_RSA_SHA_PKCS1:
            case Signature.ALG_RSA_MD5_PKCS1:
            case Signature.ALG_RSA_RIPEMD160_ISO9796:
            case Signature.ALG_RSA_RIPEMD160_PKCS1:
            case Signature.ALG_ECDSA_SHA:
            case Signature.ALG_RSA_SHA_ISO9796_MR:    
                instance = new AsymmetricSignatureImpl(algorithm);
                break;
            case Signature.ALG_DES_MAC4_NOPAD:
            case Signature.ALG_DES_MAC8_NOPAD:
            case Signature.ALG_DES_MAC4_ISO9797_M1:
            case Signature.ALG_DES_MAC8_ISO9797_M1:
            case Signature.ALG_DES_MAC4_ISO9797_M2:
            case Signature.ALG_DES_MAC8_ISO9797_M2:
            case Signature.ALG_DES_MAC8_ISO9797_1_M2_ALG3:
            case Signature.ALG_DES_MAC4_PKCS5:
            case Signature.ALG_DES_MAC8_PKCS5:
            case Signature.ALG_AES_MAC_128_NOPAD:
            case Signature.ALG_HMAC_SHA1:                
            case Signature.ALG_HMAC_SHA_256:                
            case Signature.ALG_HMAC_SHA_384:                
            case Signature.ALG_HMAC_SHA_512:                
            case Signature.ALG_HMAC_MD5:                
            case Signature.ALG_HMAC_RIPEMD160:
            case Signature.ALG_AES_CMAC_128:
                instance = new SymmetricSignatureImpl(algorithm);
                break;

            default:
                CryptoException.throwIt(CryptoException.NO_SUCH_ALGORITHM);
                break;


        }
        return instance;
    }
    
}