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/bitops.h>
  14 #include <linux/types.h>
  15
  16 #define AEGIS_BLOCK_SIZE 16
  17
  18 union aegis_block {
  19         __le64 words64[AEGIS_BLOCK_SIZE / sizeof(__le64)];
  20         __le32 words32[AEGIS_BLOCK_SIZE / sizeof(__le32)];
  21         u8 bytes[AEGIS_BLOCK_SIZE];
  22 };
  23
  24 #define AEGIS_BLOCK_ALIGN (__alignof__(union aegis_block))
  25 #define AEGIS_ALIGNED(p) IS_ALIGNED((uintptr_t)p, AEGIS_BLOCK_ALIGN)
  26
  27 static __always_inline void crypto_aegis_block_xor(union aegis_block *dst,
  28                                                    const union aegis_block *src)
  29 {
  30         dst->words64[0] ^= src->words64[0];
  31         dst->words64[1] ^= src->words64[1];
  32 }
  33
  34 static __always_inline void crypto_aegis_block_and(union aegis_block *dst,
  35                                                    const union aegis_block *src)
  36 {
  37         dst->words64[0] &= src->words64[0];
  38         dst->words64[1] &= src->words64[1];
  39 }
  40
  41 static __always_inline void crypto_aegis_aesenc(union aegis_block *dst,
  42                                                 const union aegis_block *src,
  43                                                 const union aegis_block *key)
  44 {
  45         const u8  *s  = src->bytes;
  46         const u32 *t = crypto_ft_tab[0];
  47         u32 d0, d1, d2, d3;
  48
  49         d0 = t[s[ 0]] ^ rol32(t[s[ 5]], 8) ^ rol32(t[s[10]], 16) ^ rol32(t[s[15]], 24);
  50         d1 = t[s[ 4]] ^ rol32(t[s[ 9]], 8) ^ rol32(t[s[14]], 16) ^ rol32(t[s[ 3]], 24);
  51         d2 = t[s[ 8]] ^ rol32(t[s[13]], 8) ^ rol32(t[s[ 2]], 16) ^ rol32(t[s[ 7]], 24);
  52         d3 = t[s[12]] ^ rol32(t[s[ 1]], 8) ^ rol32(t[s[ 6]], 16) ^ rol32(t[s[11]], 24);
  53
  54         dst->words32[0] = cpu_to_le32(d0) ^ key->words32[0];
  55         dst->words32[1] = cpu_to_le32(d1) ^ key->words32[1];
  56         dst->words32[2] = cpu_to_le32(d2) ^ key->words32[2];
  57         dst->words32[3] = cpu_to_le32(d3) ^ key->words32[3];
  58 }
  59
  60 #endif /* _CRYPTO_AEGIS_H */