xref: /openbmc/linux/crypto/blake2b_generic.c (revision 0cdc438e)
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 
blake2b_increment_counter(struct blake2b_state * S,const u64 inc)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 
blake2b_compress_one_generic(struct blake2b_state * S,const u8 block[BLAKE2B_BLOCK_SIZE])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://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 
blake2b_compress_generic(struct blake2b_state * state,const u8 * block,size_t nblocks,u32 inc)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 
crypto_blake2b_update_generic(struct shash_desc * desc,const u8 * in,unsigned int inlen)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 
crypto_blake2b_final_generic(struct shash_desc * desc,u8 * out)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 
blake2b_mod_init(void)164 static int __init blake2b_mod_init(void)
165 {
166 	return crypto_register_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
167 }
168 
blake2b_mod_fini(void)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