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 struct aegis_state;
  25
  26 extern int aegis128_have_aes_insn;
  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 bool crypto_aegis128_have_simd(void);
  32 void crypto_aegis128_update_simd(struct aegis_state *state, const void *msg);
  33 void crypto_aegis128_init_simd(struct aegis_state *state,
  34                                const union aegis_block *key,
  35                                const u8 *iv);
  36 void crypto_aegis128_encrypt_chunk_simd(struct aegis_state *state, u8 *dst,
  37                                         const u8 *src, unsigned int size);
  38 void crypto_aegis128_decrypt_chunk_simd(struct aegis_state *state, u8 *dst,
  39                                         const u8 *src, unsigned int size);
  40 int crypto_aegis128_final_simd(struct aegis_state *state,
  41                                union aegis_block *tag_xor,
  42                                unsigned int assoclen,
  43                                unsigned int cryptlen,
  44                                unsigned int authsize);
  45
  46 static __always_inline void crypto_aegis_block_xor(union aegis_block *dst,
  47                                                    const union aegis_block *src)
  48 {
  49         dst->words64[0] ^= src->words64[0];
  50         dst->words64[1] ^= src->words64[1];
  51 }
  52
  53 static __always_inline void crypto_aegis_block_and(union aegis_block *dst,
  54                                                    const union aegis_block *src)
  55 {
  56         dst->words64[0] &= src->words64[0];
  57         dst->words64[1] &= src->words64[1];
  58 }
  59
  60 static __always_inline void crypto_aegis_aesenc(union aegis_block *dst,
  61                                                 const union aegis_block *src,
  62                                                 const union aegis_block *key)
  63 {
  64         const u8  *s  = src->bytes;
  65         const u32 *t = crypto_ft_tab[0];
  66         u32 d0, d1, d2, d3;
  67
  68         d0 = t[s[ 0]] ^ rol32(t[s[ 5]], 8) ^ rol32(t[s[10]], 16) ^ rol32(t[s[15]], 24);
  69         d1 = t[s[ 4]] ^ rol32(t[s[ 9]], 8) ^ rol32(t[s[14]], 16) ^ rol32(t[s[ 3]], 24);
  70         d2 = t[s[ 8]] ^ rol32(t[s[13]], 8) ^ rol32(t[s[ 2]], 16) ^ rol32(t[s[ 7]], 24);
  71         d3 = t[s[12]] ^ rol32(t[s[ 1]], 8) ^ rol32(t[s[ 6]], 16) ^ rol32(t[s[11]], 24);
  72
  73         dst->words32[0] = cpu_to_le32(d0) ^ key->words32[0];
  74         dst->words32[1] = cpu_to_le32(d1) ^ key->words32[1];
  75         dst->words32[2] = cpu_to_le32(d2) ^ key->words32[2];
  76         dst->words32[3] = cpu_to_le32(d3) ^ key->words32[3];
  77 }
  78
  79 #endif /* _CRYPTO_AEGIS_H */