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(p: 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://bugs.llvm.org/show_bug.cgi?id=45803 */ |
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(S: state, inc); |
119 | blake2b_compress_one_generic(S: 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, compress: 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, compress: 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(algs: blake2b_algs, ARRAY_SIZE(blake2b_algs)); |
167 | } |
168 | |
169 | static void __exit blake2b_mod_fini(void) |
170 | { |
171 | crypto_unregister_shashes(algs: 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 | |