1 // SPDX-License-Identifier: (GPL-2.0-only OR Apache-2.0)
2 /*
3 * Generic implementation of the BLAKE2b digest algorithm. Based on the BLAKE2b
4 * reference implementation, but it has been heavily modified for use in the
5 * kernel. The reference implementation was:
6 *
7 * Copyright 2012, Samuel Neves <sneves@dei.uc.pt>. You may use this under
8 * the terms of the CC0, the OpenSSL Licence, or the Apache Public License
9 * 2.0, at your option. The terms of these licenses can be found at:
10 *
11 * - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
12 * - OpenSSL license : https://www.openssl.org/source/license.html
13 * - Apache 2.0 : https://www.apache.org/licenses/LICENSE-2.0
14 *
15 * More information about BLAKE2 can be found at https://blake2.net.
16 */
17
18 #include <asm/unaligned.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/bitops.h>
22 #include <crypto/internal/blake2b.h>
23 #include <crypto/internal/hash.h>
24
25 static const u8 blake2b_sigma[12][16] = {
26 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
27 { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
28 { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
29 { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
30 { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
31 { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 },
32 { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 },
33 { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 },
34 { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 },
35 { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },
36 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
37 { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 }
38 };
39
40 static void blake2b_increment_counter(struct blake2b_state *S, const u64 inc)
41 {
42 S->t[0] += inc;
43 S->t[1] += (S->t[0] < inc);
44 }
45
46 #define G(r,i,a,b,c,d) \
47 do { \
48 a = a + b + m[blake2b_sigma[r][2*i+0]]; \
49 d = ror64(d ^ a, 32); \
50 c = c + d; \
51 b = ror64(b ^ c, 24); \
52 a = a + b + m[blake2b_sigma[r][2*i+1]]; \
53 d = ror64(d ^ a, 16); \
54 c = c + d; \
55 b = ror64(b ^ c, 63); \
56 } while (0)
57
58 #define ROUND(r) \
59 do { \
60 G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
61 G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
62 G(r,2,v[ 2],v[ 6],v[10],v[14]); \
63 G(r,3,v[ 3],v[ 7],v[11],v[15]); \
64 G(r,4,v[ 0],v[ 5],v[10],v[15]); \
65 G(r,5,v[ 1],v[ 6],v[11],v[12]); \
66 G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
67 G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
68 } while (0)
69
70 static void blake2b_compress_one_generic(struct blake2b_state *S,
71 const u8 block[BLAKE2B_BLOCK_SIZE])
72 {
73 u64 m[16];
74 u64 v[16];
75 size_t i;
76
77 for (i = 0; i < 16; ++i)
78 m[i] = get_unaligned_le64(block + i * sizeof(m[i]));
79
80 for (i = 0; i < 8; ++i)
81 v[i] = S->h[i];
82
83 v[ 8] = BLAKE2B_IV0;
84 v[ 9] = BLAKE2B_IV1;
85 v[10] = BLAKE2B_IV2;
86 v[11] = BLAKE2B_IV3;
87 v[12] = BLAKE2B_IV4 ^ S->t[0];
88 v[13] = BLAKE2B_IV5 ^ S->t[1];
89 v[14] = BLAKE2B_IV6 ^ S->f[0];
90 v[15] = BLAKE2B_IV7 ^ S->f[1];
91
92 ROUND(0);
93 ROUND(1);
94 ROUND(2);
95 ROUND(3);
96 ROUND(4);
97 ROUND(5);
98 ROUND(6);
99 ROUND(7);
100 ROUND(8);
101 ROUND(9);
102 ROUND(10);
103 ROUND(11);
104 #ifdef CONFIG_CC_IS_CLANG
105 #pragma nounroll /* https://llvm.org/pr45803 */
106 #endif
107 for (i = 0; i < 8; ++i)
108 S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
109 }
110
111 #undef G
112 #undef ROUND
113
114 void blake2b_compress_generic(struct blake2b_state *state,
115 const u8 *block, size_t nblocks, u32 inc)
116 {
117 do {
118 blake2b_increment_counter(state, inc);
119 blake2b_compress_one_generic(state, block);
120 block += BLAKE2B_BLOCK_SIZE;
121 } while (--nblocks);
122 }
123 EXPORT_SYMBOL(blake2b_compress_generic);
124
125 static int crypto_blake2b_update_generic(struct shash_desc *desc,
126 const u8 *in, unsigned int inlen)
127 {
128 return crypto_blake2b_update(desc, in, inlen, blake2b_compress_generic);
129 }
130
131 static int crypto_blake2b_final_generic(struct shash_desc *desc, u8 *out)
132 {
133 return crypto_blake2b_final(desc, out, blake2b_compress_generic);
134 }
135
136 #define BLAKE2B_ALG(name, driver_name, digest_size) \
137 { \
138 .base.cra_name = name, \
139 .base.cra_driver_name = driver_name, \
140 .base.cra_priority = 100, \
141 .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, \
142 .base.cra_blocksize = BLAKE2B_BLOCK_SIZE, \
143 .base.cra_ctxsize = sizeof(struct blake2b_tfm_ctx), \
144 .base.cra_module = THIS_MODULE, \
145 .digestsize = digest_size, \
146 .setkey = crypto_blake2b_setkey, \
147 .init = crypto_blake2b_init, \
148 .update = crypto_blake2b_update_generic, \
149 .final = crypto_blake2b_final_generic, \
150 .descsize = sizeof(struct blake2b_state), \
151 }
152
153 static struct shash_alg blake2b_algs[] = {
154 BLAKE2B_ALG("blake2b-160", "blake2b-160-generic",
155 BLAKE2B_160_HASH_SIZE),
156 BLAKE2B_ALG("blake2b-256", "blake2b-256-generic",
157 BLAKE2B_256_HASH_SIZE),
158 BLAKE2B_ALG("blake2b-384", "blake2b-384-generic",
159 BLAKE2B_384_HASH_SIZE),
160 BLAKE2B_ALG("blake2b-512", "blake2b-512-generic",
161 BLAKE2B_512_HASH_SIZE),
162 };
163
164 static int __init blake2b_mod_init(void)
165 {
166 return crypto_register_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
167 }
168
169 static void __exit blake2b_mod_fini(void)
170 {
171 crypto_unregister_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
172 }
173
174 subsys_initcall(blake2b_mod_init);
175 module_exit(blake2b_mod_fini);
176
177 MODULE_AUTHOR("David Sterba <kdave@kernel.org>");
178 MODULE_DESCRIPTION("BLAKE2b generic implementation");
179 MODULE_LICENSE("GPL");
180 MODULE_ALIAS_CRYPTO("blake2b-160");
181 MODULE_ALIAS_CRYPTO("blake2b-160-generic");
182 MODULE_ALIAS_CRYPTO("blake2b-256");
183 MODULE_ALIAS_CRYPTO("blake2b-256-generic");
184 MODULE_ALIAS_CRYPTO("blake2b-384");
185 MODULE_ALIAS_CRYPTO("blake2b-384-generic");
186 MODULE_ALIAS_CRYPTO("blake2b-512");
187 MODULE_ALIAS_CRYPTO("blake2b-512-generic");
188
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