LCOV - code coverage report
Current view: top level - lib/crypto - blake2s.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 30 30 100.0 %
Date: 2023-08-24 13:40:31 Functions: 3 3 100.0 %

          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             :  * This is an implementation of the BLAKE2s hash and PRF functions.
       6             :  *
       7             :  * Information: https://blake2.net/
       8             :  *
       9             :  */
      10             : 
      11             : #include <crypto/internal/blake2s.h>
      12             : #include <linux/types.h>
      13             : #include <linux/string.h>
      14             : #include <linux/kernel.h>
      15             : #include <linux/module.h>
      16             : #include <linux/init.h>
      17             : #include <linux/bug.h>
      18             : 
      19             : static inline void blake2s_set_lastblock(struct blake2s_state *state)
      20             : {
      21         521 :         state->f[0] = -1;
      22             : }
      23             : 
      24        1815 : void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen)
      25             : {
      26        1815 :         const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
      27             : 
      28        1815 :         if (unlikely(!inlen))
      29             :                 return;
      30        1446 :         if (inlen > fill) {
      31        1490 :                 memcpy(state->buf + state->buflen, in, fill);
      32         745 :                 blake2s_compress(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
      33         745 :                 state->buflen = 0;
      34         745 :                 in += fill;
      35         745 :                 inlen -= fill;
      36             :         }
      37        1446 :         if (inlen > BLAKE2S_BLOCK_SIZE) {
      38         355 :                 const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
      39         355 :                 blake2s_compress(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
      40         355 :                 in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
      41         355 :                 inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
      42             :         }
      43        2892 :         memcpy(state->buf + state->buflen, in, inlen);
      44        1446 :         state->buflen += inlen;
      45             : }
      46             : EXPORT_SYMBOL(blake2s_update);
      47             : 
      48         521 : void blake2s_final(struct blake2s_state *state, u8 *out)
      49             : {
      50         521 :         WARN_ON(IS_ENABLED(DEBUG) && !out);
      51         521 :         blake2s_set_lastblock(state);
      52        1042 :         memset(state->buf + state->buflen, 0,
      53             :                BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
      54         521 :         blake2s_compress(state, state->buf, 1, state->buflen);
      55         521 :         cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
      56        1042 :         memcpy(out, state->h, state->outlen);
      57         521 :         memzero_explicit(state, sizeof(*state));
      58         521 : }
      59             : EXPORT_SYMBOL(blake2s_final);
      60             : 
      61           1 : static int __init blake2s_mod_init(void)
      62             : {
      63           1 :         if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) &&
      64           1 :             WARN_ON(!blake2s_selftest()))
      65             :                 return -ENODEV;
      66           1 :         return 0;
      67             : }
      68             : 
      69             : module_init(blake2s_mod_init);
      70             : MODULE_DESCRIPTION("BLAKE2s hash function");
      71             : MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");

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