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
  22 union aegis_block {
  23         __le64 words64[AEGIS_BLOCK_SIZE / sizeof(__le64)];
  24         __le32 words32[AEGIS_BLOCK_SIZE / sizeof(__le32)];
  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
  31 static 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
  42 static 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
  49 static 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
  56 static void crypto_aegis_aesenc(union aegis_block *dst,
  57                                 const union aegis_block *src,
  58                                 const union aegis_block *key)
  59 {
  60         const u8  *s  = src->bytes;
  61         const u32 *t0 = crypto_ft_tab[0];
  62         const u32 *t1 = crypto_ft_tab[1];
  63         const u32 *t2 = crypto_ft_tab[2];
  64         const u32 *t3 = crypto_ft_tab[3];
  65         u32 d0, d1, d2, d3;
  66
  67         d0 = t0[s[ 0]] ^ t1[s[ 5]] ^ t2[s[10]] ^ t3[s[15]];
  68         d1 = t0[s[ 4]] ^ t1[s[ 9]] ^ t2[s[14]] ^ t3[s[ 3]];
  69         d2 = t0[s[ 8]] ^ t1[s[13]] ^ t2[s[ 2]] ^ t3[s[ 7]];
  70         d3 = t0[s[12]] ^ t1[s[ 1]] ^ t2[s[ 6]] ^ t3[s[11]];
  71
  72         dst->words32[0] = cpu_to_le32(d0) ^ key->words32[0];
  73         dst->words32[1] = cpu_to_le32(d1) ^ key->words32[1];
  74         dst->words32[2] = cpu_to_le32(d2) ^ key->words32[2];
  75         dst->words32[3] = cpu_to_le32(d3) ^ key->words32[3];
  76 }
  77
  78 #endif /* _CRYPTO_AEGIS_H */