crypto/aegis.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   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
   9 #ifndef _CRYPTO_AEGIS_H
  10 #define _CRYPTO_AEGIS_H
  11
  12 #include <crypto/aes.h>
  13 #include <linux/types.h>
  14
  15 #define AEGIS_BLOCK_SIZE 16
  16
  17 union aegis_block {
  18         __le64 words64[AEGIS_BLOCK_SIZE / sizeof(__le64)];
  19         __le32 words32[AEGIS_BLOCK_SIZE / sizeof(__le32)];
  20         u8 bytes[AEGIS_BLOCK_SIZE];
  21 };
  22
  23 #define AEGIS_BLOCK_ALIGN (__alignof__(union aegis_block))
  24 #define AEGIS_ALIGNED(p) IS_ALIGNED((uintptr_t)p, AEGIS_BLOCK_ALIGN)
  25
  26 static const union aegis_block crypto_aegis_const[2] = {
  27         { .words64 = {
  28                 cpu_to_le64(U64_C(0x0d08050302010100)),
  29                 cpu_to_le64(U64_C(0x6279e99059372215)),
  30         } },
  31         { .words64 = {
  32                 cpu_to_le64(U64_C(0xf12fc26d55183ddb)),
  33                 cpu_to_le64(U64_C(0xdd28b57342311120)),
  34         } },
  35 };
  36
  37 static void crypto_aegis_block_xor(union aegis_block *dst,
  38                                    const union aegis_block *src)
  39 {
  40         dst->words64[0] ^= src->words64[0];
  41         dst->words64[1] ^= src->words64[1];
  42 }
  43
  44 static void crypto_aegis_block_and(union aegis_block *dst,
  45                                    const union aegis_block *src)
  46 {
  47         dst->words64[0] &= src->words64[0];
  48         dst->words64[1] &= src->words64[1];
  49 }
  50
  51 static void crypto_aegis_aesenc(union aegis_block *dst,
  52                                 const union aegis_block *src,
  53                                 const union aegis_block *key)
  54 {
  55         const u8  *s  = src->bytes;
  56         const u32 *t0 = crypto_ft_tab[0];
  57         const u32 *t1 = crypto_ft_tab[1];
  58         const u32 *t2 = crypto_ft_tab[2];
  59         const u32 *t3 = crypto_ft_tab[3];
  60         u32 d0, d1, d2, d3;
  61
  62         d0 = t0[s[ 0]] ^ t1[s[ 5]] ^ t2[s[10]] ^ t3[s[15]];
  63         d1 = t0[s[ 4]] ^ t1[s[ 9]] ^ t2[s[14]] ^ t3[s[ 3]];
  64         d2 = t0[s[ 8]] ^ t1[s[13]] ^ t2[s[ 2]] ^ t3[s[ 7]];
  65         d3 = t0[s[12]] ^ t1[s[ 1]] ^ t2[s[ 6]] ^ t3[s[11]];
  66
  67         dst->words32[0] = cpu_to_le32(d0) ^ key->words32[0];
  68         dst->words32[1] = cpu_to_le32(d1) ^ key->words32[1];
  69         dst->words32[2] = cpu_to_le32(d2) ^ key->words32[2];
  70         dst->words32[3] = cpu_to_le32(d3) ^ key->words32[3];
  71 }
  72
  73 #endif /* _CRYPTO_AEGIS_H */