LXR linux/crypto/aegis.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * AEGIS common definitions
   4 *
   5 * Copyright (c) 2018 Ondrej Mosnacek <omosnacek@gmail.com>
   6 * Copyright (c) 2018 Red Hat, Inc. All rights reserved.
   7 *
   8 * This program is free software; you can redistribute it and/or modify it
   9 * under the terms of the GNU General Public License as published by the Free
  10 * Software Foundation; either version 2 of the License, or (at your option)
  11 * any later version.
  12 */
  13
  14#ifndef _CRYPTO_AEGIS_H
  15#define _CRYPTO_AEGIS_H
  16
  17#include <crypto/aes.h>
  18#include <linux/types.h>
  19
  20#define AEGIS_BLOCK_SIZE 16
  21
  22union aegis_block {
  23        __le64 words64[AEGIS_BLOCK_SIZE / sizeof(__le64)];
  24        u32 words32[AEGIS_BLOCK_SIZE / sizeof(u32)];
  25        u8 bytes[AEGIS_BLOCK_SIZE];
  26};
  27
  28#define AEGIS_BLOCK_ALIGN (__alignof__(union aegis_block))
  29#define AEGIS_ALIGNED(p) IS_ALIGNED((uintptr_t)p, AEGIS_BLOCK_ALIGN)
  30
  31static const union aegis_block crypto_aegis_const[2] = {
  32        { .words64 = {
  33                cpu_to_le64(U64_C(0x0d08050302010100)),
  34                cpu_to_le64(U64_C(0x6279e99059372215)),
  35        } },
  36        { .words64 = {
  37                cpu_to_le64(U64_C(0xf12fc26d55183ddb)),
  38                cpu_to_le64(U64_C(0xdd28b57342311120)),
  39        } },
  40};
  41
  42static void crypto_aegis_block_xor(union aegis_block *dst,
  43                                   const union aegis_block *src)
  44{
  45        dst->words64[0] ^= src->words64[0];
  46        dst->words64[1] ^= src->words64[1];
  47}
  48
  49static void crypto_aegis_block_and(union aegis_block *dst,
  50                                   const union aegis_block *src)
  51{
  52        dst->words64[0] &= src->words64[0];
  53        dst->words64[1] &= src->words64[1];
  54}
  55
  56static void crypto_aegis_aesenc(union aegis_block *dst,
  57                                const union aegis_block *src,
  58                                const union aegis_block *key)
  59{
  60        u32 *d = dst->words32;
  61        const u8  *s  = src->bytes;
  62        const u32 *k  = key->words32;
  63        const u32 *t0 = crypto_ft_tab[0];
  64        const u32 *t1 = crypto_ft_tab[1];
  65        const u32 *t2 = crypto_ft_tab[2];
  66        const u32 *t3 = crypto_ft_tab[3];
  67        u32 d0, d1, d2, d3;
  68
  69        d0 = t0[s[ 0]] ^ t1[s[ 5]] ^ t2[s[10]] ^ t3[s[15]] ^ k[0];
  70        d1 = t0[s[ 4]] ^ t1[s[ 9]] ^ t2[s[14]] ^ t3[s[ 3]] ^ k[1];
  71        d2 = t0[s[ 8]] ^ t1[s[13]] ^ t2[s[ 2]] ^ t3[s[ 7]] ^ k[2];
  72        d3 = t0[s[12]] ^ t1[s[ 1]] ^ t2[s[ 6]] ^ t3[s[11]] ^ k[3];
  73
  74        d[0] = d0;
  75        d[1] = d1;
  76        d[2] = d2;
  77        d[3] = d3;
  78}
  79
  80#endif /* _CRYPTO_AEGIS_H */
  81