1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Cryptographic API.
4 *
5 * SHA1 Secure Hash Algorithm.
6 *
7 * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
8 *
9 * Based on crypto/sha1_generic.c, which is:
10 *
11 * Copyright (c) Alan Smithee.
12 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
13 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
14 */
15
16 #include <linux/mm.h>
17 #include <crypto/sha1.h>
18 #include <crypto/sha1_base.h>
19 #include <linux/init.h>
20 #include <linux/types.h>
21 #include <linux/module.h>
22 #include <asm/byteorder.h>
23 #include <asm/octeon/octeon.h>
24 #include <crypto/internal/hash.h>
25
26 #include "octeon-crypto.h"
27
28 /*
29 * We pass everything as 64-bit. OCTEON can handle misaligned data.
30 */
31
octeon_sha1_store_hash(struct sha1_state * sctx)32 static void octeon_sha1_store_hash(struct sha1_state *sctx)
33 {
34 u64 *hash = (u64 *)sctx->state;
35 union {
36 u32 word[2];
37 u64 dword;
38 } hash_tail = { { sctx->state[4], } };
39
40 write_octeon_64bit_hash_dword(hash[0], 0);
41 write_octeon_64bit_hash_dword(hash[1], 1);
42 write_octeon_64bit_hash_dword(hash_tail.dword, 2);
43 memzero_explicit(&hash_tail.word[0], sizeof(hash_tail.word[0]));
44 }
45
octeon_sha1_read_hash(struct sha1_state * sctx)46 static void octeon_sha1_read_hash(struct sha1_state *sctx)
47 {
48 u64 *hash = (u64 *)sctx->state;
49 union {
50 u32 word[2];
51 u64 dword;
52 } hash_tail;
53
54 hash[0] = read_octeon_64bit_hash_dword(0);
55 hash[1] = read_octeon_64bit_hash_dword(1);
56 hash_tail.dword = read_octeon_64bit_hash_dword(2);
57 sctx->state[4] = hash_tail.word[0];
58 memzero_explicit(&hash_tail.dword, sizeof(hash_tail.dword));
59 }
60
octeon_sha1_transform(const void * _block)61 static void octeon_sha1_transform(const void *_block)
62 {
63 const u64 *block = _block;
64
65 write_octeon_64bit_block_dword(block[0], 0);
66 write_octeon_64bit_block_dword(block[1], 1);
67 write_octeon_64bit_block_dword(block[2], 2);
68 write_octeon_64bit_block_dword(block[3], 3);
69 write_octeon_64bit_block_dword(block[4], 4);
70 write_octeon_64bit_block_dword(block[5], 5);
71 write_octeon_64bit_block_dword(block[6], 6);
72 octeon_sha1_start(block[7]);
73 }
74
__octeon_sha1_update(struct sha1_state * sctx,const u8 * data,unsigned int len)75 static void __octeon_sha1_update(struct sha1_state *sctx, const u8 *data,
76 unsigned int len)
77 {
78 unsigned int partial;
79 unsigned int done;
80 const u8 *src;
81
82 partial = sctx->count % SHA1_BLOCK_SIZE;
83 sctx->count += len;
84 done = 0;
85 src = data;
86
87 if ((partial + len) >= SHA1_BLOCK_SIZE) {
88 if (partial) {
89 done = -partial;
90 memcpy(sctx->buffer + partial, data,
91 done + SHA1_BLOCK_SIZE);
92 src = sctx->buffer;
93 }
94
95 do {
96 octeon_sha1_transform(src);
97 done += SHA1_BLOCK_SIZE;
98 src = data + done;
99 } while (done + SHA1_BLOCK_SIZE <= len);
100
101 partial = 0;
102 }
103 memcpy(sctx->buffer + partial, src, len - done);
104 }
105
octeon_sha1_update(struct shash_desc * desc,const u8 * data,unsigned int len)106 static int octeon_sha1_update(struct shash_desc *desc, const u8 *data,
107 unsigned int len)
108 {
109 struct sha1_state *sctx = shash_desc_ctx(desc);
110 struct octeon_cop2_state state;
111 unsigned long flags;
112
113 /*
114 * Small updates never reach the crypto engine, so the generic sha1 is
115 * faster because of the heavyweight octeon_crypto_enable() /
116 * octeon_crypto_disable().
117 */
118 if ((sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
119 return crypto_sha1_update(desc, data, len);
120
121 flags = octeon_crypto_enable(&state);
122 octeon_sha1_store_hash(sctx);
123
124 __octeon_sha1_update(sctx, data, len);
125
126 octeon_sha1_read_hash(sctx);
127 octeon_crypto_disable(&state, flags);
128
129 return 0;
130 }
131
octeon_sha1_final(struct shash_desc * desc,u8 * out)132 static int octeon_sha1_final(struct shash_desc *desc, u8 *out)
133 {
134 struct sha1_state *sctx = shash_desc_ctx(desc);
135 static const u8 padding[64] = { 0x80, };
136 struct octeon_cop2_state state;
137 __be32 *dst = (__be32 *)out;
138 unsigned int pad_len;
139 unsigned long flags;
140 unsigned int index;
141 __be64 bits;
142 int i;
143
144 /* Save number of bits. */
145 bits = cpu_to_be64(sctx->count << 3);
146
147 /* Pad out to 56 mod 64. */
148 index = sctx->count & 0x3f;
149 pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
150
151 flags = octeon_crypto_enable(&state);
152 octeon_sha1_store_hash(sctx);
153
154 __octeon_sha1_update(sctx, padding, pad_len);
155
156 /* Append length (before padding). */
157 __octeon_sha1_update(sctx, (const u8 *)&bits, sizeof(bits));
158
159 octeon_sha1_read_hash(sctx);
160 octeon_crypto_disable(&state, flags);
161
162 /* Store state in digest */
163 for (i = 0; i < 5; i++)
164 dst[i] = cpu_to_be32(sctx->state[i]);
165
166 /* Zeroize sensitive information. */
167 memset(sctx, 0, sizeof(*sctx));
168
169 return 0;
170 }
171
octeon_sha1_export(struct shash_desc * desc,void * out)172 static int octeon_sha1_export(struct shash_desc *desc, void *out)
173 {
174 struct sha1_state *sctx = shash_desc_ctx(desc);
175
176 memcpy(out, sctx, sizeof(*sctx));
177 return 0;
178 }
179
octeon_sha1_import(struct shash_desc * desc,const void * in)180 static int octeon_sha1_import(struct shash_desc *desc, const void *in)
181 {
182 struct sha1_state *sctx = shash_desc_ctx(desc);
183
184 memcpy(sctx, in, sizeof(*sctx));
185 return 0;
186 }
187
188 static struct shash_alg octeon_sha1_alg = {
189 .digestsize = SHA1_DIGEST_SIZE,
190 .init = sha1_base_init,
191 .update = octeon_sha1_update,
192 .final = octeon_sha1_final,
193 .export = octeon_sha1_export,
194 .import = octeon_sha1_import,
195 .descsize = sizeof(struct sha1_state),
196 .statesize = sizeof(struct sha1_state),
197 .base = {
198 .cra_name = "sha1",
199 .cra_driver_name= "octeon-sha1",
200 .cra_priority = OCTEON_CR_OPCODE_PRIORITY,
201 .cra_blocksize = SHA1_BLOCK_SIZE,
202 .cra_module = THIS_MODULE,
203 }
204 };
205
octeon_sha1_mod_init(void)206 static int __init octeon_sha1_mod_init(void)
207 {
208 if (!octeon_has_crypto())
209 return -ENOTSUPP;
210 return crypto_register_shash(&octeon_sha1_alg);
211 }
212
octeon_sha1_mod_fini(void)213 static void __exit octeon_sha1_mod_fini(void)
214 {
215 crypto_unregister_shash(&octeon_sha1_alg);
216 }
217
218 module_init(octeon_sha1_mod_init);
219 module_exit(octeon_sha1_mod_fini);
220
221 MODULE_LICENSE("GPL");
222 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm (OCTEON)");
223 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
224