1 /*
2 * Cryptographic API.
3 *
4 * SHA-512 and SHA-384 Secure Hash Algorithm.
5 *
6 * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
7 *
8 * Based on crypto/sha512_generic.c, which is:
9 *
10 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
11 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
12 * Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
13 *
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License as published by the
16 * Free Software Foundation; either version 2, or (at your option) any
17 * later version.
18 */
19
20 #include <linux/mm.h>
21 #include <crypto/sha.h>
22 #include <linux/init.h>
23 #include <linux/types.h>
24 #include <linux/module.h>
25 #include <asm/byteorder.h>
26 #include <asm/octeon/octeon.h>
27 #include <crypto/internal/hash.h>
28
29 #include "octeon-crypto.h"
30
31 /*
32 * We pass everything as 64-bit. OCTEON can handle misaligned data.
33 */
34
octeon_sha512_store_hash(struct sha512_state * sctx)35 static void octeon_sha512_store_hash(struct sha512_state *sctx)
36 {
37 write_octeon_64bit_hash_sha512(sctx->state[0], 0);
38 write_octeon_64bit_hash_sha512(sctx->state[1], 1);
39 write_octeon_64bit_hash_sha512(sctx->state[2], 2);
40 write_octeon_64bit_hash_sha512(sctx->state[3], 3);
41 write_octeon_64bit_hash_sha512(sctx->state[4], 4);
42 write_octeon_64bit_hash_sha512(sctx->state[5], 5);
43 write_octeon_64bit_hash_sha512(sctx->state[6], 6);
44 write_octeon_64bit_hash_sha512(sctx->state[7], 7);
45 }
46
octeon_sha512_read_hash(struct sha512_state * sctx)47 static void octeon_sha512_read_hash(struct sha512_state *sctx)
48 {
49 sctx->state[0] = read_octeon_64bit_hash_sha512(0);
50 sctx->state[1] = read_octeon_64bit_hash_sha512(1);
51 sctx->state[2] = read_octeon_64bit_hash_sha512(2);
52 sctx->state[3] = read_octeon_64bit_hash_sha512(3);
53 sctx->state[4] = read_octeon_64bit_hash_sha512(4);
54 sctx->state[5] = read_octeon_64bit_hash_sha512(5);
55 sctx->state[6] = read_octeon_64bit_hash_sha512(6);
56 sctx->state[7] = read_octeon_64bit_hash_sha512(7);
57 }
58
octeon_sha512_transform(const void * _block)59 static void octeon_sha512_transform(const void *_block)
60 {
61 const u64 *block = _block;
62
63 write_octeon_64bit_block_sha512(block[0], 0);
64 write_octeon_64bit_block_sha512(block[1], 1);
65 write_octeon_64bit_block_sha512(block[2], 2);
66 write_octeon_64bit_block_sha512(block[3], 3);
67 write_octeon_64bit_block_sha512(block[4], 4);
68 write_octeon_64bit_block_sha512(block[5], 5);
69 write_octeon_64bit_block_sha512(block[6], 6);
70 write_octeon_64bit_block_sha512(block[7], 7);
71 write_octeon_64bit_block_sha512(block[8], 8);
72 write_octeon_64bit_block_sha512(block[9], 9);
73 write_octeon_64bit_block_sha512(block[10], 10);
74 write_octeon_64bit_block_sha512(block[11], 11);
75 write_octeon_64bit_block_sha512(block[12], 12);
76 write_octeon_64bit_block_sha512(block[13], 13);
77 write_octeon_64bit_block_sha512(block[14], 14);
78 octeon_sha512_start(block[15]);
79 }
80
octeon_sha512_init(struct shash_desc * desc)81 static int octeon_sha512_init(struct shash_desc *desc)
82 {
83 struct sha512_state *sctx = shash_desc_ctx(desc);
84
85 sctx->state[0] = SHA512_H0;
86 sctx->state[1] = SHA512_H1;
87 sctx->state[2] = SHA512_H2;
88 sctx->state[3] = SHA512_H3;
89 sctx->state[4] = SHA512_H4;
90 sctx->state[5] = SHA512_H5;
91 sctx->state[6] = SHA512_H6;
92 sctx->state[7] = SHA512_H7;
93 sctx->count[0] = sctx->count[1] = 0;
94
95 return 0;
96 }
97
octeon_sha384_init(struct shash_desc * desc)98 static int octeon_sha384_init(struct shash_desc *desc)
99 {
100 struct sha512_state *sctx = shash_desc_ctx(desc);
101
102 sctx->state[0] = SHA384_H0;
103 sctx->state[1] = SHA384_H1;
104 sctx->state[2] = SHA384_H2;
105 sctx->state[3] = SHA384_H3;
106 sctx->state[4] = SHA384_H4;
107 sctx->state[5] = SHA384_H5;
108 sctx->state[6] = SHA384_H6;
109 sctx->state[7] = SHA384_H7;
110 sctx->count[0] = sctx->count[1] = 0;
111
112 return 0;
113 }
114
__octeon_sha512_update(struct sha512_state * sctx,const u8 * data,unsigned int len)115 static void __octeon_sha512_update(struct sha512_state *sctx, const u8 *data,
116 unsigned int len)
117 {
118 unsigned int part_len;
119 unsigned int index;
120 unsigned int i;
121
122 /* Compute number of bytes mod 128. */
123 index = sctx->count[0] % SHA512_BLOCK_SIZE;
124
125 /* Update number of bytes. */
126 if ((sctx->count[0] += len) < len)
127 sctx->count[1]++;
128
129 part_len = SHA512_BLOCK_SIZE - index;
130
131 /* Transform as many times as possible. */
132 if (len >= part_len) {
133 memcpy(&sctx->buf[index], data, part_len);
134 octeon_sha512_transform(sctx->buf);
135
136 for (i = part_len; i + SHA512_BLOCK_SIZE <= len;
137 i += SHA512_BLOCK_SIZE)
138 octeon_sha512_transform(&data[i]);
139
140 index = 0;
141 } else {
142 i = 0;
143 }
144
145 /* Buffer remaining input. */
146 memcpy(&sctx->buf[index], &data[i], len - i);
147 }
148
octeon_sha512_update(struct shash_desc * desc,const u8 * data,unsigned int len)149 static int octeon_sha512_update(struct shash_desc *desc, const u8 *data,
150 unsigned int len)
151 {
152 struct sha512_state *sctx = shash_desc_ctx(desc);
153 struct octeon_cop2_state state;
154 unsigned long flags;
155
156 /*
157 * Small updates never reach the crypto engine, so the generic sha512 is
158 * faster because of the heavyweight octeon_crypto_enable() /
159 * octeon_crypto_disable().
160 */
161 if ((sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
162 return crypto_sha512_update(desc, data, len);
163
164 flags = octeon_crypto_enable(&state);
165 octeon_sha512_store_hash(sctx);
166
167 __octeon_sha512_update(sctx, data, len);
168
169 octeon_sha512_read_hash(sctx);
170 octeon_crypto_disable(&state, flags);
171
172 return 0;
173 }
174
octeon_sha512_final(struct shash_desc * desc,u8 * hash)175 static int octeon_sha512_final(struct shash_desc *desc, u8 *hash)
176 {
177 struct sha512_state *sctx = shash_desc_ctx(desc);
178 static u8 padding[128] = { 0x80, };
179 struct octeon_cop2_state state;
180 __be64 *dst = (__be64 *)hash;
181 unsigned int pad_len;
182 unsigned long flags;
183 unsigned int index;
184 __be64 bits[2];
185 int i;
186
187 /* Save number of bits. */
188 bits[1] = cpu_to_be64(sctx->count[0] << 3);
189 bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
190
191 /* Pad out to 112 mod 128. */
192 index = sctx->count[0] & 0x7f;
193 pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
194
195 flags = octeon_crypto_enable(&state);
196 octeon_sha512_store_hash(sctx);
197
198 __octeon_sha512_update(sctx, padding, pad_len);
199
200 /* Append length (before padding). */
201 __octeon_sha512_update(sctx, (const u8 *)bits, sizeof(bits));
202
203 octeon_sha512_read_hash(sctx);
204 octeon_crypto_disable(&state, flags);
205
206 /* Store state in digest. */
207 for (i = 0; i < 8; i++)
208 dst[i] = cpu_to_be64(sctx->state[i]);
209
210 /* Zeroize sensitive information. */
211 memset(sctx, 0, sizeof(struct sha512_state));
212
213 return 0;
214 }
215
octeon_sha384_final(struct shash_desc * desc,u8 * hash)216 static int octeon_sha384_final(struct shash_desc *desc, u8 *hash)
217 {
218 u8 D[64];
219
220 octeon_sha512_final(desc, D);
221
222 memcpy(hash, D, 48);
223 memzero_explicit(D, 64);
224
225 return 0;
226 }
227
228 static struct shash_alg octeon_sha512_algs[2] = { {
229 .digestsize = SHA512_DIGEST_SIZE,
230 .init = octeon_sha512_init,
231 .update = octeon_sha512_update,
232 .final = octeon_sha512_final,
233 .descsize = sizeof(struct sha512_state),
234 .base = {
235 .cra_name = "sha512",
236 .cra_driver_name= "octeon-sha512",
237 .cra_priority = OCTEON_CR_OPCODE_PRIORITY,
238 .cra_blocksize = SHA512_BLOCK_SIZE,
239 .cra_module = THIS_MODULE,
240 }
241 }, {
242 .digestsize = SHA384_DIGEST_SIZE,
243 .init = octeon_sha384_init,
244 .update = octeon_sha512_update,
245 .final = octeon_sha384_final,
246 .descsize = sizeof(struct sha512_state),
247 .base = {
248 .cra_name = "sha384",
249 .cra_driver_name= "octeon-sha384",
250 .cra_priority = OCTEON_CR_OPCODE_PRIORITY,
251 .cra_blocksize = SHA384_BLOCK_SIZE,
252 .cra_module = THIS_MODULE,
253 }
254 } };
255
octeon_sha512_mod_init(void)256 static int __init octeon_sha512_mod_init(void)
257 {
258 if (!octeon_has_crypto())
259 return -ENOTSUPP;
260 return crypto_register_shashes(octeon_sha512_algs,
261 ARRAY_SIZE(octeon_sha512_algs));
262 }
263
octeon_sha512_mod_fini(void)264 static void __exit octeon_sha512_mod_fini(void)
265 {
266 crypto_unregister_shashes(octeon_sha512_algs,
267 ARRAY_SIZE(octeon_sha512_algs));
268 }
269
270 module_init(octeon_sha512_mod_init);
271 module_exit(octeon_sha512_mod_fini);
272
273 MODULE_LICENSE("GPL");
274 MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms (OCTEON)");
275 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
276
