LCOV - code coverage report
Current view: top level - include/crypto - blake2s.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 29 29 100.0 %
Date: 2023-08-24 13:40:31 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /* SPDX-License-Identifier: GPL-2.0 OR MIT */
       2             : /*
       3             :  * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
       4             :  */
       5             : 
       6             : #ifndef _CRYPTO_BLAKE2S_H
       7             : #define _CRYPTO_BLAKE2S_H
       8             : 
       9             : #include <linux/bug.h>
      10             : #include <linux/kconfig.h>
      11             : #include <linux/types.h>
      12             : #include <linux/string.h>
      13             : 
      14             : enum blake2s_lengths {
      15             :         BLAKE2S_BLOCK_SIZE = 64,
      16             :         BLAKE2S_HASH_SIZE = 32,
      17             :         BLAKE2S_KEY_SIZE = 32,
      18             : 
      19             :         BLAKE2S_128_HASH_SIZE = 16,
      20             :         BLAKE2S_160_HASH_SIZE = 20,
      21             :         BLAKE2S_224_HASH_SIZE = 28,
      22             :         BLAKE2S_256_HASH_SIZE = 32,
      23             : };
      24             : 
      25             : struct blake2s_state {
      26             :         /* 'h', 't', and 'f' are used in assembly code, so keep them as-is. */
      27             :         u32 h[8];
      28             :         u32 t[2];
      29             :         u32 f[2];
      30             :         u8 buf[BLAKE2S_BLOCK_SIZE];
      31             :         unsigned int buflen;
      32             :         unsigned int outlen;
      33             : };
      34             : 
      35             : enum blake2s_iv {
      36             :         BLAKE2S_IV0 = 0x6A09E667UL,
      37             :         BLAKE2S_IV1 = 0xBB67AE85UL,
      38             :         BLAKE2S_IV2 = 0x3C6EF372UL,
      39             :         BLAKE2S_IV3 = 0xA54FF53AUL,
      40             :         BLAKE2S_IV4 = 0x510E527FUL,
      41             :         BLAKE2S_IV5 = 0x9B05688CUL,
      42             :         BLAKE2S_IV6 = 0x1F83D9ABUL,
      43             :         BLAKE2S_IV7 = 0x5BE0CD19UL,
      44             : };
      45             : 
      46         521 : static inline void __blake2s_init(struct blake2s_state *state, size_t outlen,
      47             :                                   const void *key, size_t keylen)
      48             : {
      49         521 :         state->h[0] = BLAKE2S_IV0 ^ (0x01010000 | keylen << 8 | outlen);
      50         521 :         state->h[1] = BLAKE2S_IV1;
      51         521 :         state->h[2] = BLAKE2S_IV2;
      52         521 :         state->h[3] = BLAKE2S_IV3;
      53         521 :         state->h[4] = BLAKE2S_IV4;
      54         521 :         state->h[5] = BLAKE2S_IV5;
      55         521 :         state->h[6] = BLAKE2S_IV6;
      56         521 :         state->h[7] = BLAKE2S_IV7;
      57         521 :         state->t[0] = 0;
      58         521 :         state->t[1] = 0;
      59         521 :         state->f[0] = 0;
      60         521 :         state->f[1] = 0;
      61         521 :         state->buflen = 0;
      62         521 :         state->outlen = outlen;
      63         521 :         if (keylen) {
      64        1010 :                 memcpy(state->buf, key, keylen);
      65        1010 :                 memset(&state->buf[keylen], 0, BLAKE2S_BLOCK_SIZE - keylen);
      66         505 :                 state->buflen = BLAKE2S_BLOCK_SIZE;
      67             :         }
      68         521 : }
      69             : 
      70             : static inline void blake2s_init(struct blake2s_state *state,
      71             :                                 const size_t outlen)
      72             : {
      73           8 :         __blake2s_init(state, outlen, NULL, 0);
      74             : }
      75             : 
      76             : static inline void blake2s_init_key(struct blake2s_state *state,
      77             :                                     const size_t outlen, const void *key,
      78             :                                     const size_t keylen)
      79             : {
      80         251 :         WARN_ON(IS_ENABLED(DEBUG) && (!outlen || outlen > BLAKE2S_HASH_SIZE ||
      81             :                 !key || !keylen || keylen > BLAKE2S_KEY_SIZE));
      82             : 
      83         251 :         __blake2s_init(state, outlen, key, keylen);
      84             : }
      85             : 
      86             : void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen);
      87             : void blake2s_final(struct blake2s_state *state, u8 *out);
      88             : 
      89         262 : static inline void blake2s(u8 *out, const u8 *in, const u8 *key,
      90             :                            const size_t outlen, const size_t inlen,
      91             :                            const size_t keylen)
      92             : {
      93             :         struct blake2s_state state;
      94             : 
      95         262 :         WARN_ON(IS_ENABLED(DEBUG) && ((!in && inlen > 0) || !out || !outlen ||
      96             :                 outlen > BLAKE2S_HASH_SIZE || keylen > BLAKE2S_KEY_SIZE ||
      97             :                 (!key && keylen)));
      98             : 
      99         262 :         __blake2s_init(&state, outlen, key, keylen);
     100         262 :         blake2s_update(&state, in, inlen);
     101         262 :         blake2s_final(&state, out);
     102         262 : }
     103             : 
     104             : #endif /* _CRYPTO_BLAKE2S_H */

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