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  Copyright (c) 2019-2022, Intel Corporation

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  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 of 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
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*******************************************************************************/

#include <string.h>

#include "intel-ipsec-mb.h"
#include "include/wireless_common.h"

int
snow3g_f8_iv_gen(const uint32_t count, const uint8_t bearer,
                 const uint8_t dir, void *iv_ptr)
{
        uint32_t *iv32 = (uint32_t *) iv_ptr;

        if (iv_ptr == NULL)
                return -1;

        /* Bearer must contain 5 bits only */
        if (bearer >= (1<<5))
                return -1;

        /* Direction must contain 1 bit only */
        if (dir > 1)
                return -1;
        /**
         * Parameters are passed in Little Endian format
         * and reversed to generate the IV in Big Endian format
         */
        /* IV[3] = BEARER || DIRECTION || 0s */
        iv32[3] = bswap4((bearer << 27) | (dir << 26));

        /* IV[2] = COUNT */
        iv32[2] = bswap4(count);

        /* IV[1] = BEARER || DIRECTION || 0s */
        iv32[1] = iv32[3];

        /* IV[0] = COUNT */
        iv32[0] = iv32[2];

        return 0;
}

int
snow3g_f9_iv_gen(const uint32_t count, const uint32_t fresh,
                 const uint8_t dir, void *iv_ptr)
{
        uint32_t *iv32 = (uint32_t *) iv_ptr;

        if (iv_ptr == NULL)
                return -1;

        /* Direction must contain 1 bit only */
        if (dir > 1)
                return -1;
        /**
         * Parameters are passed in Little Endian format
         * and reversed to generate the IV in Big Endian format
         */
        /* IV[3] = FRESH ^ (DIRECTION[0] << 17) */
        iv32[3] = bswap4(fresh ^ (dir << 15));

        /* IV[2] = DIRECTION[0] ^ COUNT[0-31] */
        iv32[2] = bswap4(count ^ (dir << 31));

        /* IV[1] = FRESH */
        iv32[1] = bswap4(fresh);

        /* IV[0] = COUNT */
        iv32[0] = bswap4(count);

        return 0;
}
