1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Cryptographic API.
4 *
5 * SHA-224 and SHA-256 Secure Hash Algorithm.
6 *
7 * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
8 *
9 * Based on crypto/sha256_generic.c, which is:
10 *
11 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
12 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
13 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
14 * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
15 */
16
17 #include <linux/mm.h>
18 #include <crypto/sha2.h>
19 #include <crypto/sha256_base.h>
20 #include <linux/init.h>
21 #include <linux/types.h>
22 #include <linux/module.h>
23 #include <asm/byteorder.h>
24 #include <asm/octeon/octeon.h>
25 #include <crypto/internal/hash.h>
26
27 #include "octeon-crypto.h"
28
29 /*
30 * We pass everything as 64-bit. OCTEON can handle misaligned data.
31 */
32
33 static void octeon_sha256_store_hash(struct sha256_state *sctx)
34 {
35 u64 *hash = (u64 *)sctx->state;
36
37 write_octeon_64bit_hash_dword(hash[0], 0);
38 write_octeon_64bit_hash_dword(hash[1], 1);
39 write_octeon_64bit_hash_dword(hash[2], 2);
40 write_octeon_64bit_hash_dword(hash[3], 3);
41 }
42
43 static void octeon_sha256_read_hash(struct sha256_state *sctx)
44 {
45 u64 *hash = (u64 *)sctx->state;
46
47 hash[0] = read_octeon_64bit_hash_dword(0);
48 hash[1] = read_octeon_64bit_hash_dword(1);
49 hash[2] = read_octeon_64bit_hash_dword(2);
50 hash[3] = read_octeon_64bit_hash_dword(3);
51 }
52
53 static void octeon_sha256_transform(const void *_block)
54 {
55 const u64 *block = _block;
56
57 write_octeon_64bit_block_dword(block[0], 0);
58 write_octeon_64bit_block_dword(block[1], 1);
59 write_octeon_64bit_block_dword(block[2], 2);
60 write_octeon_64bit_block_dword(block[3], 3);
61 write_octeon_64bit_block_dword(block[4], 4);
62 write_octeon_64bit_block_dword(block[5], 5);
63 write_octeon_64bit_block_dword(block[6], 6);
64 octeon_sha256_start(block[7]);
65 }
66
67 static void __octeon_sha256_update(struct sha256_state *sctx, const u8 *data,
68 unsigned int len)
69 {
70 unsigned int partial;
71 unsigned int done;
72 const u8 *src;
73
74 partial = sctx->count % SHA256_BLOCK_SIZE;
75 sctx->count += len;
76 done = 0;
77 src = data;
78
79 if ((partial + len) >= SHA256_BLOCK_SIZE) {
80 if (partial) {
81 done = -partial;
82 memcpy(sctx->buf + partial, data,
83 done + SHA256_BLOCK_SIZE);
84 src = sctx->buf;
85 }
86
87 do {
88 octeon_sha256_transform(src);
89 done += SHA256_BLOCK_SIZE;
90 src = data + done;
91 } while (done + SHA256_BLOCK_SIZE <= len);
92
93 partial = 0;
94 }
95 memcpy(sctx->buf + partial, src, len - done);
96 }
97
98 static int octeon_sha256_update(struct shash_desc *desc, const u8 *data,
99 unsigned int len)
100 {
101 struct sha256_state *sctx = shash_desc_ctx(desc);
102 struct octeon_cop2_state state;
103 unsigned long flags;
104
105 /*
106 * Small updates never reach the crypto engine, so the generic sha256 is
107 * faster because of the heavyweight octeon_crypto_enable() /
108 * octeon_crypto_disable().
109 */
110 if ((sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
111 return crypto_sha256_update(desc, data, len);
112
113 flags = octeon_crypto_enable(&state);
114 octeon_sha256_store_hash(sctx);
115
116 __octeon_sha256_update(sctx, data, len);
117
118 octeon_sha256_read_hash(sctx);
119 octeon_crypto_disable(&state, flags);
120
121 return 0;
122 }
123
124 static int octeon_sha256_final(struct shash_desc *desc, u8 *out)
125 {
126 struct sha256_state *sctx = shash_desc_ctx(desc);
127 static const u8 padding[64] = { 0x80, };
128 struct octeon_cop2_state state;
129 __be32 *dst = (__be32 *)out;
130 unsigned int pad_len;
131 unsigned long flags;
132 unsigned int index;
133 __be64 bits;
134 int i;
135
136 /* Save number of bits. */
137 bits = cpu_to_be64(sctx->count << 3);
138
139 /* Pad out to 56 mod 64. */
140 index = sctx->count & 0x3f;
141 pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
142
143 flags = octeon_crypto_enable(&state);
144 octeon_sha256_store_hash(sctx);
145
146 __octeon_sha256_update(sctx, padding, pad_len);
147
148 /* Append length (before padding). */
149 __octeon_sha256_update(sctx, (const u8 *)&bits, sizeof(bits));
150
151 octeon_sha256_read_hash(sctx);
152 octeon_crypto_disable(&state, flags);
153
154 /* Store state in digest */
155 for (i = 0; i < 8; i++)
156 dst[i] = cpu_to_be32(sctx->state[i]);
157
158 /* Zeroize sensitive information. */
159 memset(sctx, 0, sizeof(*sctx));
160
161 return 0;
162 }
163
164 static int octeon_sha224_final(struct shash_desc *desc, u8 *hash)
165 {
166 u8 D[SHA256_DIGEST_SIZE];
167
168 octeon_sha256_final(desc, D);
169
170 memcpy(hash, D, SHA224_DIGEST_SIZE);
171 memzero_explicit(D, SHA256_DIGEST_SIZE);
172
173 return 0;
174 }
175
176 static int octeon_sha256_export(struct shash_desc *desc, void *out)
177 {
178 struct sha256_state *sctx = shash_desc_ctx(desc);
179
180 memcpy(out, sctx, sizeof(*sctx));
181 return 0;
182 }
183
184 static int octeon_sha256_import(struct shash_desc *desc, const void *in)
185 {
186 struct sha256_state *sctx = shash_desc_ctx(desc);
187
188 memcpy(sctx, in, sizeof(*sctx));
189 return 0;
190 }
191
192 static struct shash_alg octeon_sha256_algs[2] = { {
193 .digestsize = SHA256_DIGEST_SIZE,
194 .init = sha256_base_init,
195 .update = octeon_sha256_update,
196 .final = octeon_sha256_final,
197 .export = octeon_sha256_export,
198 .import = octeon_sha256_import,
199 .descsize = sizeof(struct sha256_state),
200 .statesize = sizeof(struct sha256_state),
201 .base = {
202 .cra_name = "sha256",
203 .cra_driver_name= "octeon-sha256",
204 .cra_priority = OCTEON_CR_OPCODE_PRIORITY,
205 .cra_blocksize = SHA256_BLOCK_SIZE,
206 .cra_module = THIS_MODULE,
207 }
208 }, {
209 .digestsize = SHA224_DIGEST_SIZE,
210 .init = sha224_base_init,
211 .update = octeon_sha256_update,
212 .final = octeon_sha224_final,
213 .descsize = sizeof(struct sha256_state),
214 .base = {
215 .cra_name = "sha224",
216 .cra_driver_name= "octeon-sha224",
217 .cra_blocksize = SHA224_BLOCK_SIZE,
218 .cra_module = THIS_MODULE,
219 }
220 } };
221
222 static int __init octeon_sha256_mod_init(void)
223 {
224 if (!octeon_has_crypto())
225 return -ENOTSUPP;
226 return crypto_register_shashes(octeon_sha256_algs,
227 ARRAY_SIZE(octeon_sha256_algs));
228 }
229
230 static void __exit octeon_sha256_mod_fini(void)
231 {
232 crypto_unregister_shashes(octeon_sha256_algs,
233 ARRAY_SIZE(octeon_sha256_algs));
234 }
235
236 module_init(octeon_sha256_mod_init);
237 module_exit(octeon_sha256_mod_fini);
238
239 MODULE_LICENSE("GPL");
240 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm (OCTEON)");
241 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
242
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.