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 #if IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_BLAKE2S)
20 # define blake2s_compress blake2s_compress_arch
21 #else
22 # define blake2s_compress blake2s_compress_generic
23 #endif
24
blake2s_update(struct blake2s_state * state,const u8 * in,size_t inlen)25 void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen)
26 {
27 __blake2s_update(state, in, inlen, blake2s_compress);
28 }
29 EXPORT_SYMBOL(blake2s_update);
30
blake2s_final(struct blake2s_state * state,u8 * out)31 void blake2s_final(struct blake2s_state *state, u8 *out)
32 {
33 WARN_ON(IS_ENABLED(DEBUG) && !out);
34 __blake2s_final(state, out, blake2s_compress);
35 memzero_explicit(state, sizeof(*state));
36 }
37 EXPORT_SYMBOL(blake2s_final);
38
blake2s256_hmac(u8 * out,const u8 * in,const u8 * key,const size_t inlen,const size_t keylen)39 void blake2s256_hmac(u8 *out, const u8 *in, const u8 *key, const size_t inlen,
40 const size_t keylen)
41 {
42 struct blake2s_state state;
43 u8 x_key[BLAKE2S_BLOCK_SIZE] __aligned(__alignof__(u32)) = { 0 };
44 u8 i_hash[BLAKE2S_HASH_SIZE] __aligned(__alignof__(u32));
45 int i;
46
47 if (keylen > BLAKE2S_BLOCK_SIZE) {
48 blake2s_init(&state, BLAKE2S_HASH_SIZE);
49 blake2s_update(&state, key, keylen);
50 blake2s_final(&state, x_key);
51 } else
52 memcpy(x_key, key, keylen);
53
54 for (i = 0; i < BLAKE2S_BLOCK_SIZE; ++i)
55 x_key[i] ^= 0x36;
56
57 blake2s_init(&state, BLAKE2S_HASH_SIZE);
58 blake2s_update(&state, x_key, BLAKE2S_BLOCK_SIZE);
59 blake2s_update(&state, in, inlen);
60 blake2s_final(&state, i_hash);
61
62 for (i = 0; i < BLAKE2S_BLOCK_SIZE; ++i)
63 x_key[i] ^= 0x5c ^ 0x36;
64
65 blake2s_init(&state, BLAKE2S_HASH_SIZE);
66 blake2s_update(&state, x_key, BLAKE2S_BLOCK_SIZE);
67 blake2s_update(&state, i_hash, BLAKE2S_HASH_SIZE);
68 blake2s_final(&state, i_hash);
69
70 memcpy(out, i_hash, BLAKE2S_HASH_SIZE);
71 memzero_explicit(x_key, BLAKE2S_BLOCK_SIZE);
72 memzero_explicit(i_hash, BLAKE2S_HASH_SIZE);
73 }
74 EXPORT_SYMBOL(blake2s256_hmac);
75
blake2s_mod_init(void)76 static int __init blake2s_mod_init(void)
77 {
78 if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) &&
79 WARN_ON(!blake2s_selftest()))
80 return -ENODEV;
81 return 0;
82 }
83
blake2s_mod_exit(void)84 static void __exit blake2s_mod_exit(void)
85 {
86 }
87
88 module_init(blake2s_mod_init);
89 module_exit(blake2s_mod_exit);
90 MODULE_LICENSE("GPL v2");
91 MODULE_DESCRIPTION("BLAKE2s hash function");
92 MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");
93