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lcp_hlp.h

/*
 * Copyright 2001 - 2010 Intel Corporation. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name Intel Corporation nor the names of its contributors may be
 * used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __TXT_LCP2_HELPER_H__
#define __TXT_LCP2_HELPER_H__

static inline lcp_signature_t *get_signature(const lcp_policy_list_t *pollist)
{
    if ( pollist == NULL )
        return NULL;

    if ( pollist->sig_alg != LCP_POLSALG_RSA_PKCS_15 )
        return NULL;

    return (lcp_signature_t *)((const void *)&pollist->policy_elements +
                               pollist->policy_elements_size);
}

static inline size_t get_signature_size(const lcp_signature_t *sig)
{
    if ( sig == NULL )
        return 0;
    return offsetof(lcp_signature_t, pubkey_value) + 2*sig->pubkey_size;
}


static inline size_t get_policy_list_size(const lcp_policy_list_t *pollist)
{
    size_t size = 0;

    if ( pollist == NULL )
        return 0;

    size = offsetof(lcp_policy_list_t, policy_elements) +
           pollist->policy_elements_size;
    /* add sig size */
    if ( pollist->sig_alg == LCP_POLSALG_RSA_PKCS_15 )
        size += get_signature_size(get_signature(pollist));
    return size;
}

#endif    /*  __TXT_LCP2_HELPER_H__ */

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