virtualmips/sbox.h at main · RetroBSD/virtualmips · GitHub

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/*
 * Cisco router simulation platform.
 * Copyright (c) 2007 Christophe Fillot (cf@utc.fr)
 *
 * S-box functions.
 */

#ifndef __SBOX_H__
#define __SBOX_H__

#include <sys/types.h>
#include "utils.h"

extern m_uint32_t sbox_array[];

static inline m_uint32_t sbox_compute (m_uint8_t * data, int len)
{
    m_uint32_t hash = 0;

    while (len > 0) {
        hash ^= sbox_array[*data];
        hash *= 3;
        data++;
    }

    return (hash);
}

static forced_inline m_uint32_t sbox_u32 (m_uint32_t val)
{
    m_uint32_t hash = 0;

    hash ^= sbox_array[(m_uint8_t) val];
    hash *= 3;
    val >>= 8;

    hash ^= sbox_array[(m_uint8_t) val];
    hash *= 3;
    val >>= 8;

    hash ^= sbox_array[(m_uint8_t) val];
    hash *= 3;
    val >>= 8;

    hash ^= sbox_array[(m_uint8_t) val];
    return (hash);
}

#endif