include/crypto/blake2b.h

   1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
   2
   3 #ifndef _CRYPTO_BLAKE2B_H
   4 #define _CRYPTO_BLAKE2B_H
   5
   6 #include <linux/bug.h>
   7 #include <linux/types.h>
   8 #include <linux/string.h>
   9
  10 enum blake2b_lengths {
  11         BLAKE2B_BLOCK_SIZE = 128,
  12         BLAKE2B_HASH_SIZE = 64,
  13         BLAKE2B_KEY_SIZE = 64,
  14
  15         BLAKE2B_160_HASH_SIZE = 20,
  16         BLAKE2B_256_HASH_SIZE = 32,
  17         BLAKE2B_384_HASH_SIZE = 48,
  18         BLAKE2B_512_HASH_SIZE = 64,
  19 };
  20
  21 struct blake2b_state {
  22         /* 'h', 't', and 'f' are used in assembly code, so keep them as-is. */
  23         u64 h[8];
  24         u64 t[2];
  25         u64 f[2];
  26         u8 buf[BLAKE2B_BLOCK_SIZE];
  27         unsigned int buflen;
  28         unsigned int outlen;
  29 };
  30
  31 enum blake2b_iv {
  32         BLAKE2B_IV0 = 0x6A09E667F3BCC908ULL,
  33         BLAKE2B_IV1 = 0xBB67AE8584CAA73BULL,
  34         BLAKE2B_IV2 = 0x3C6EF372FE94F82BULL,
  35         BLAKE2B_IV3 = 0xA54FF53A5F1D36F1ULL,
  36         BLAKE2B_IV4 = 0x510E527FADE682D1ULL,
  37         BLAKE2B_IV5 = 0x9B05688C2B3E6C1FULL,
  38         BLAKE2B_IV6 = 0x1F83D9ABFB41BD6BULL,
  39         BLAKE2B_IV7 = 0x5BE0CD19137E2179ULL,
  40 };
  41
  42 static inline void __blake2b_init(struct blake2b_state *state, size_t outlen,
  43                                   const void *key, size_t keylen)
  44 {
  45         state->h[0] = BLAKE2B_IV0 ^ (0x01010000 | keylen << 8 | outlen);
  46         state->h[1] = BLAKE2B_IV1;
  47         state->h[2] = BLAKE2B_IV2;
  48         state->h[3] = BLAKE2B_IV3;
  49         state->h[4] = BLAKE2B_IV4;
  50         state->h[5] = BLAKE2B_IV5;
  51         state->h[6] = BLAKE2B_IV6;
  52         state->h[7] = BLAKE2B_IV7;
  53         state->t[0] = 0;
  54         state->t[1] = 0;
  55         state->f[0] = 0;
  56         state->f[1] = 0;
  57         state->buflen = 0;
  58         state->outlen = outlen;
  59         if (keylen) {
  60                 memcpy(state->buf, key, keylen);
  61                 memset(&state->buf[keylen], 0, BLAKE2B_BLOCK_SIZE - keylen);
  62                 state->buflen = BLAKE2B_BLOCK_SIZE;
  63         }
  64 }
  65
  66 #endif /* _CRYPTO_BLAKE2B_H */