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authorJussi Kivilinna <jussi.kivilinna@mbnet.fi>2012-06-18 07:07:19 -0400
committerHerbert Xu <herbert@gondor.apana.org.au>2012-06-27 02:42:01 -0400
commit596d875052dac6bf084f0c3a3e946fb4709b727b (patch)
treebd5bf090efd70b60d1c26c1ca7b6a559cbcf72b2 /arch/x86
parente81792fbc2a6fa4969f724b959829667fb2d4f01 (diff)
crypto: serpent-sse2 - split generic glue code to new helper module
Now that serpent-sse2 glue code has been made generic, it can be split to separate module. Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/crypto/Makefile1
-rw-r--r--arch/x86/crypto/glue_helper.c307
-rw-r--r--arch/x86/crypto/serpent_sse2_glue.c352
-rw-r--r--arch/x86/include/asm/crypto/glue_helper.h115
4 files changed, 424 insertions, 351 deletions
diff --git a/arch/x86/crypto/Makefile b/arch/x86/crypto/Makefile
index ad746916f91..e908e5de82d 100644
--- a/arch/x86/crypto/Makefile
+++ b/arch/x86/crypto/Makefile
@@ -3,6 +3,7 @@
3# 3#
4 4
5obj-$(CONFIG_CRYPTO_ABLK_HELPER_X86) += ablk_helper.o 5obj-$(CONFIG_CRYPTO_ABLK_HELPER_X86) += ablk_helper.o
6obj-$(CONFIG_CRYPTO_GLUE_HELPER_X86) += glue_helper.o
6 7
7obj-$(CONFIG_CRYPTO_AES_586) += aes-i586.o 8obj-$(CONFIG_CRYPTO_AES_586) += aes-i586.o
8obj-$(CONFIG_CRYPTO_TWOFISH_586) += twofish-i586.o 9obj-$(CONFIG_CRYPTO_TWOFISH_586) += twofish-i586.o
diff --git a/arch/x86/crypto/glue_helper.c b/arch/x86/crypto/glue_helper.c
new file mode 100644
index 00000000000..4854f0f31e4
--- /dev/null
+++ b/arch/x86/crypto/glue_helper.c
@@ -0,0 +1,307 @@
1/*
2 * Shared glue code for 128bit block ciphers
3 *
4 * Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
5 *
6 * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
7 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
8 * CTR part based on code (crypto/ctr.c) by:
9 * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
24 * USA
25 *
26 */
27
28#include <linux/module.h>
29#include <crypto/b128ops.h>
30#include <crypto/lrw.h>
31#include <crypto/xts.h>
32#include <asm/crypto/glue_helper.h>
33#include <crypto/scatterwalk.h>
34
35static int __glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx,
36 struct blkcipher_desc *desc,
37 struct blkcipher_walk *walk)
38{
39 void *ctx = crypto_blkcipher_ctx(desc->tfm);
40 const unsigned int bsize = 128 / 8;
41 unsigned int nbytes, i, func_bytes;
42 bool fpu_enabled = false;
43 int err;
44
45 err = blkcipher_walk_virt(desc, walk);
46
47 while ((nbytes = walk->nbytes)) {
48 u8 *wsrc = walk->src.virt.addr;
49 u8 *wdst = walk->dst.virt.addr;
50
51 fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
52 desc, fpu_enabled, nbytes);
53
54 for (i = 0; i < gctx->num_funcs; i++) {
55 func_bytes = bsize * gctx->funcs[i].num_blocks;
56
57 /* Process multi-block batch */
58 if (nbytes >= func_bytes) {
59 do {
60 gctx->funcs[i].fn_u.ecb(ctx, wdst,
61 wsrc);
62
63 wsrc += func_bytes;
64 wdst += func_bytes;
65 nbytes -= func_bytes;
66 } while (nbytes >= func_bytes);
67
68 if (nbytes < bsize)
69 goto done;
70 }
71 }
72
73done:
74 err = blkcipher_walk_done(desc, walk, nbytes);
75 }
76
77 glue_fpu_end(fpu_enabled);
78 return err;
79}
80
81int glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx,
82 struct blkcipher_desc *desc, struct scatterlist *dst,
83 struct scatterlist *src, unsigned int nbytes)
84{
85 struct blkcipher_walk walk;
86
87 blkcipher_walk_init(&walk, dst, src, nbytes);
88 return __glue_ecb_crypt_128bit(gctx, desc, &walk);
89}
90EXPORT_SYMBOL_GPL(glue_ecb_crypt_128bit);
91
92static unsigned int __glue_cbc_encrypt_128bit(const common_glue_func_t fn,
93 struct blkcipher_desc *desc,
94 struct blkcipher_walk *walk)
95{
96 void *ctx = crypto_blkcipher_ctx(desc->tfm);
97 const unsigned int bsize = 128 / 8;
98 unsigned int nbytes = walk->nbytes;
99 u128 *src = (u128 *)walk->src.virt.addr;
100 u128 *dst = (u128 *)walk->dst.virt.addr;
101 u128 *iv = (u128 *)walk->iv;
102
103 do {
104 u128_xor(dst, src, iv);
105 fn(ctx, (u8 *)dst, (u8 *)dst);
106 iv = dst;
107
108 src += 1;
109 dst += 1;
110 nbytes -= bsize;
111 } while (nbytes >= bsize);
112
113 u128_xor((u128 *)walk->iv, (u128 *)walk->iv, iv);
114 return nbytes;
115}
116
117int glue_cbc_encrypt_128bit(const common_glue_func_t fn,
118 struct blkcipher_desc *desc,
119 struct scatterlist *dst,
120 struct scatterlist *src, unsigned int nbytes)
121{
122 struct blkcipher_walk walk;
123 int err;
124
125 blkcipher_walk_init(&walk, dst, src, nbytes);
126 err = blkcipher_walk_virt(desc, &walk);
127
128 while ((nbytes = walk.nbytes)) {
129 nbytes = __glue_cbc_encrypt_128bit(fn, desc, &walk);
130 err = blkcipher_walk_done(desc, &walk, nbytes);
131 }
132
133 return err;
134}
135EXPORT_SYMBOL_GPL(glue_cbc_encrypt_128bit);
136
137static unsigned int
138__glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
139 struct blkcipher_desc *desc,
140 struct blkcipher_walk *walk)
141{
142 void *ctx = crypto_blkcipher_ctx(desc->tfm);
143 const unsigned int bsize = 128 / 8;
144 unsigned int nbytes = walk->nbytes;
145 u128 *src = (u128 *)walk->src.virt.addr;
146 u128 *dst = (u128 *)walk->dst.virt.addr;
147 u128 last_iv;
148 unsigned int num_blocks, func_bytes;
149 unsigned int i;
150
151 /* Start of the last block. */
152 src += nbytes / bsize - 1;
153 dst += nbytes / bsize - 1;
154
155 last_iv = *src;
156
157 for (i = 0; i < gctx->num_funcs; i++) {
158 num_blocks = gctx->funcs[i].num_blocks;
159 func_bytes = bsize * num_blocks;
160
161 /* Process multi-block batch */
162 if (nbytes >= func_bytes) {
163 do {
164 nbytes -= func_bytes - bsize;
165 src -= num_blocks - 1;
166 dst -= num_blocks - 1;
167
168 gctx->funcs[i].fn_u.cbc(ctx, dst, src);
169
170 nbytes -= bsize;
171 if (nbytes < bsize)
172 goto done;
173
174 u128_xor(dst, dst, src - 1);
175 src -= 1;
176 dst -= 1;
177 } while (nbytes >= func_bytes);
178
179 if (nbytes < bsize)
180 goto done;
181 }
182 }
183
184done:
185 u128_xor(dst, dst, (u128 *)walk->iv);
186 *(u128 *)walk->iv = last_iv;
187
188 return nbytes;
189}
190
191int glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
192 struct blkcipher_desc *desc,
193 struct scatterlist *dst,
194 struct scatterlist *src, unsigned int nbytes)
195{
196 const unsigned int bsize = 128 / 8;
197 bool fpu_enabled = false;
198 struct blkcipher_walk walk;
199 int err;
200
201 blkcipher_walk_init(&walk, dst, src, nbytes);
202 err = blkcipher_walk_virt(desc, &walk);
203
204 while ((nbytes = walk.nbytes)) {
205 fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
206 desc, fpu_enabled, nbytes);
207 nbytes = __glue_cbc_decrypt_128bit(gctx, desc, &walk);
208 err = blkcipher_walk_done(desc, &walk, nbytes);
209 }
210
211 glue_fpu_end(fpu_enabled);
212 return err;
213}
214EXPORT_SYMBOL_GPL(glue_cbc_decrypt_128bit);
215
216static void glue_ctr_crypt_final_128bit(const common_glue_ctr_func_t fn_ctr,
217 struct blkcipher_desc *desc,
218 struct blkcipher_walk *walk)
219{
220 void *ctx = crypto_blkcipher_ctx(desc->tfm);
221 u8 *src = (u8 *)walk->src.virt.addr;
222 u8 *dst = (u8 *)walk->dst.virt.addr;
223 unsigned int nbytes = walk->nbytes;
224 u128 ctrblk;
225 u128 tmp;
226
227 be128_to_u128(&ctrblk, (be128 *)walk->iv);
228
229 memcpy(&tmp, src, nbytes);
230 fn_ctr(ctx, &tmp, &tmp, &ctrblk);
231 memcpy(dst, &tmp, nbytes);
232
233 u128_to_be128((be128 *)walk->iv, &ctrblk);
234}
235EXPORT_SYMBOL_GPL(glue_ctr_crypt_final_128bit);
236
237static unsigned int __glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx,
238 struct blkcipher_desc *desc,
239 struct blkcipher_walk *walk)
240{
241 const unsigned int bsize = 128 / 8;
242 void *ctx = crypto_blkcipher_ctx(desc->tfm);
243 unsigned int nbytes = walk->nbytes;
244 u128 *src = (u128 *)walk->src.virt.addr;
245 u128 *dst = (u128 *)walk->dst.virt.addr;
246 u128 ctrblk;
247 unsigned int num_blocks, func_bytes;
248 unsigned int i;
249
250 be128_to_u128(&ctrblk, (be128 *)walk->iv);
251
252 /* Process multi-block batch */
253 for (i = 0; i < gctx->num_funcs; i++) {
254 num_blocks = gctx->funcs[i].num_blocks;
255 func_bytes = bsize * num_blocks;
256
257 if (nbytes >= func_bytes) {
258 do {
259 gctx->funcs[i].fn_u.ctr(ctx, dst, src, &ctrblk);
260
261 src += num_blocks;
262 dst += num_blocks;
263 nbytes -= func_bytes;
264 } while (nbytes >= func_bytes);
265
266 if (nbytes < bsize)
267 goto done;
268 }
269 }
270
271done:
272 u128_to_be128((be128 *)walk->iv, &ctrblk);
273 return nbytes;
274}
275
276int glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx,
277 struct blkcipher_desc *desc, struct scatterlist *dst,
278 struct scatterlist *src, unsigned int nbytes)
279{
280 const unsigned int bsize = 128 / 8;
281 bool fpu_enabled = false;
282 struct blkcipher_walk walk;
283 int err;
284
285 blkcipher_walk_init(&walk, dst, src, nbytes);
286 err = blkcipher_walk_virt_block(desc, &walk, bsize);
287
288 while ((nbytes = walk.nbytes) >= bsize) {
289 fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
290 desc, fpu_enabled, nbytes);
291 nbytes = __glue_ctr_crypt_128bit(gctx, desc, &walk);
292 err = blkcipher_walk_done(desc, &walk, nbytes);
293 }
294
295 glue_fpu_end(fpu_enabled);
296
297 if (walk.nbytes) {
298 glue_ctr_crypt_final_128bit(
299 gctx->funcs[gctx->num_funcs - 1].fn_u.ctr, desc, &walk);
300 err = blkcipher_walk_done(desc, &walk, 0);
301 }
302
303 return err;
304}
305EXPORT_SYMBOL_GPL(glue_ctr_crypt_128bit);
306
307MODULE_LICENSE("GPL");
diff --git a/arch/x86/crypto/serpent_sse2_glue.c b/arch/x86/crypto/serpent_sse2_glue.c
index 8c86239010a..49a32eedf0c 100644
--- a/arch/x86/crypto/serpent_sse2_glue.c
+++ b/arch/x86/crypto/serpent_sse2_glue.c
@@ -41,359 +41,9 @@
41#include <crypto/ctr.h> 41#include <crypto/ctr.h>
42#include <crypto/lrw.h> 42#include <crypto/lrw.h>
43#include <crypto/xts.h> 43#include <crypto/xts.h>
44#include <asm/i387.h>
45#include <asm/serpent-sse2.h> 44#include <asm/serpent-sse2.h>
46#include <asm/crypto/ablk_helper.h> 45#include <asm/crypto/ablk_helper.h>
47#include <crypto/scatterwalk.h> 46#include <asm/crypto/glue_helper.h>
48#include <linux/workqueue.h>
49#include <linux/spinlock.h>
50
51typedef void (*common_glue_func_t)(void *ctx, u8 *dst, const u8 *src);
52typedef void (*common_glue_cbc_func_t)(void *ctx, u128 *dst, const u128 *src);
53typedef void (*common_glue_ctr_func_t)(void *ctx, u128 *dst, const u128 *src,
54 u128 *iv);
55
56#define GLUE_FUNC_CAST(fn) ((common_glue_func_t)(fn))
57#define GLUE_CBC_FUNC_CAST(fn) ((common_glue_cbc_func_t)(fn))
58#define GLUE_CTR_FUNC_CAST(fn) ((common_glue_ctr_func_t)(fn))
59
60struct common_glue_func_entry {
61 unsigned int num_blocks; /* number of blocks that @fn will process */
62 union {
63 common_glue_func_t ecb;
64 common_glue_cbc_func_t cbc;
65 common_glue_ctr_func_t ctr;
66 } fn_u;
67};
68
69struct common_glue_ctx {
70 unsigned int num_funcs;
71 int fpu_blocks_limit; /* -1 means fpu not needed at all */
72
73 /*
74 * First funcs entry must have largest num_blocks and last funcs entry
75 * must have num_blocks == 1!
76 */
77 struct common_glue_func_entry funcs[];
78};
79
80static inline bool glue_fpu_begin(unsigned int bsize, int fpu_blocks_limit,
81 struct blkcipher_desc *desc,
82 bool fpu_enabled, unsigned int nbytes)
83{
84 if (likely(fpu_blocks_limit < 0))
85 return false;
86
87 if (fpu_enabled)
88 return true;
89
90 /*
91 * Vector-registers are only used when chunk to be processed is large
92 * enough, so do not enable FPU until it is necessary.
93 */
94 if (nbytes < bsize * (unsigned int)fpu_blocks_limit)
95 return false;
96
97 if (desc) {
98 /* prevent sleeping if FPU is in use */
99 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
100 }
101
102 kernel_fpu_begin();
103 return true;
104}
105
106static inline void glue_fpu_end(bool fpu_enabled)
107{
108 if (fpu_enabled)
109 kernel_fpu_end();
110}
111
112static int __glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx,
113 struct blkcipher_desc *desc,
114 struct blkcipher_walk *walk)
115{
116 void *ctx = crypto_blkcipher_ctx(desc->tfm);
117 const unsigned int bsize = 128 / 8;
118 unsigned int nbytes, i, func_bytes;
119 bool fpu_enabled = false;
120 int err;
121
122 err = blkcipher_walk_virt(desc, walk);
123
124 while ((nbytes = walk->nbytes)) {
125 u8 *wsrc = walk->src.virt.addr;
126 u8 *wdst = walk->dst.virt.addr;
127
128 fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
129 desc, fpu_enabled, nbytes);
130
131 for (i = 0; i < gctx->num_funcs; i++) {
132 func_bytes = bsize * gctx->funcs[i].num_blocks;
133
134 /* Process multi-block batch */
135 if (nbytes >= func_bytes) {
136 do {
137 gctx->funcs[i].fn_u.ecb(ctx, wdst,
138 wsrc);
139
140 wsrc += func_bytes;
141 wdst += func_bytes;
142 nbytes -= func_bytes;
143 } while (nbytes >= func_bytes);
144
145 if (nbytes < bsize)
146 goto done;
147 }
148 }
149
150done:
151 err = blkcipher_walk_done(desc, walk, nbytes);
152 }
153
154 glue_fpu_end(fpu_enabled);
155 return err;
156}
157
158int glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx,
159 struct blkcipher_desc *desc, struct scatterlist *dst,
160 struct scatterlist *src, unsigned int nbytes)
161{
162 struct blkcipher_walk walk;
163
164 blkcipher_walk_init(&walk, dst, src, nbytes);
165 return __glue_ecb_crypt_128bit(gctx, desc, &walk);
166}
167
168static unsigned int __glue_cbc_encrypt_128bit(const common_glue_func_t fn,
169 struct blkcipher_desc *desc,
170 struct blkcipher_walk *walk)
171{
172 void *ctx = crypto_blkcipher_ctx(desc->tfm);
173 const unsigned int bsize = 128 / 8;
174 unsigned int nbytes = walk->nbytes;
175 u128 *src = (u128 *)walk->src.virt.addr;
176 u128 *dst = (u128 *)walk->dst.virt.addr;
177 u128 *iv = (u128 *)walk->iv;
178
179 do {
180 u128_xor(dst, src, iv);
181 fn(ctx, (u8 *)dst, (u8 *)dst);
182 iv = dst;
183
184 src += 1;
185 dst += 1;
186 nbytes -= bsize;
187 } while (nbytes >= bsize);
188
189 u128_xor((u128 *)walk->iv, (u128 *)walk->iv, iv);
190 return nbytes;
191}
192
193int glue_cbc_encrypt_128bit(const common_glue_func_t fn,
194 struct blkcipher_desc *desc,
195 struct scatterlist *dst,
196 struct scatterlist *src, unsigned int nbytes)
197{
198 struct blkcipher_walk walk;
199 int err;
200
201 blkcipher_walk_init(&walk, dst, src, nbytes);
202 err = blkcipher_walk_virt(desc, &walk);
203
204 while ((nbytes = walk.nbytes)) {
205 nbytes = __glue_cbc_encrypt_128bit(fn, desc, &walk);
206 err = blkcipher_walk_done(desc, &walk, nbytes);
207 }
208
209 return err;
210}
211
212static unsigned int
213__glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
214 struct blkcipher_desc *desc,
215 struct blkcipher_walk *walk)
216{
217 void *ctx = crypto_blkcipher_ctx(desc->tfm);
218 const unsigned int bsize = 128 / 8;
219 unsigned int nbytes = walk->nbytes;
220 u128 *src = (u128 *)walk->src.virt.addr;
221 u128 *dst = (u128 *)walk->dst.virt.addr;
222 u128 last_iv;
223 unsigned int num_blocks, func_bytes;
224 unsigned int i;
225
226 /* Start of the last block. */
227 src += nbytes / bsize - 1;
228 dst += nbytes / bsize - 1;
229
230 last_iv = *src;
231
232 for (i = 0; i < gctx->num_funcs; i++) {
233 num_blocks = gctx->funcs[i].num_blocks;
234 func_bytes = bsize * num_blocks;
235
236 /* Process multi-block batch */
237 if (nbytes >= func_bytes) {
238 do {
239 nbytes -= func_bytes - bsize;
240 src -= num_blocks - 1;
241 dst -= num_blocks - 1;
242
243 gctx->funcs[i].fn_u.cbc(ctx, dst, src);
244
245 nbytes -= bsize;
246 if (nbytes < bsize)
247 goto done;
248
249 u128_xor(dst, dst, src - 1);
250 src -= 1;
251 dst -= 1;
252 } while (nbytes >= func_bytes);
253
254 if (nbytes < bsize)
255 goto done;
256 }
257 }
258
259done:
260 u128_xor(dst, dst, (u128 *)walk->iv);
261 *(u128 *)walk->iv = last_iv;
262
263 return nbytes;
264}
265
266int glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
267 struct blkcipher_desc *desc,
268 struct scatterlist *dst,
269 struct scatterlist *src, unsigned int nbytes)
270{
271 const unsigned int bsize = 128 / 8;
272 bool fpu_enabled = false;
273 struct blkcipher_walk walk;
274 int err;
275
276 blkcipher_walk_init(&walk, dst, src, nbytes);
277 err = blkcipher_walk_virt(desc, &walk);
278
279 while ((nbytes = walk.nbytes)) {
280 fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
281 desc, fpu_enabled, nbytes);
282 nbytes = __glue_cbc_decrypt_128bit(gctx, desc, &walk);
283 err = blkcipher_walk_done(desc, &walk, nbytes);
284 }
285
286 glue_fpu_end(fpu_enabled);
287 return err;
288}
289
290static inline void u128_to_be128(be128 *dst, const u128 *src)
291{
292 dst->a = cpu_to_be64(src->a);
293 dst->b = cpu_to_be64(src->b);
294}
295
296static inline void be128_to_u128(u128 *dst, const be128 *src)
297{
298 dst->a = be64_to_cpu(src->a);
299 dst->b = be64_to_cpu(src->b);
300}
301
302static inline void u128_inc(u128 *i)
303{
304 i->b++;
305 if (!i->b)
306 i->a++;
307}
308
309static void glue_ctr_crypt_final_128bit(const common_glue_ctr_func_t fn_ctr,
310 struct blkcipher_desc *desc,
311 struct blkcipher_walk *walk)
312{
313 void *ctx = crypto_blkcipher_ctx(desc->tfm);
314 u8 *src = (u8 *)walk->src.virt.addr;
315 u8 *dst = (u8 *)walk->dst.virt.addr;
316 unsigned int nbytes = walk->nbytes;
317 u128 ctrblk;
318 u128 tmp;
319
320 be128_to_u128(&ctrblk, (be128 *)walk->iv);
321
322 memcpy(&tmp, src, nbytes);
323 fn_ctr(ctx, &tmp, &tmp, &ctrblk);
324 memcpy(dst, &tmp, nbytes);
325
326 u128_to_be128((be128 *)walk->iv, &ctrblk);
327}
328
329static unsigned int __glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx,
330 struct blkcipher_desc *desc,
331 struct blkcipher_walk *walk)
332{
333 const unsigned int bsize = 128 / 8;
334 void *ctx = crypto_blkcipher_ctx(desc->tfm);
335 unsigned int nbytes = walk->nbytes;
336 u128 *src = (u128 *)walk->src.virt.addr;
337 u128 *dst = (u128 *)walk->dst.virt.addr;
338 u128 ctrblk;
339 unsigned int num_blocks, func_bytes;
340 unsigned int i;
341
342 be128_to_u128(&ctrblk, (be128 *)walk->iv);
343
344 /* Process multi-block batch */
345 for (i = 0; i < gctx->num_funcs; i++) {
346 num_blocks = gctx->funcs[i].num_blocks;
347 func_bytes = bsize * num_blocks;
348
349 if (nbytes >= func_bytes) {
350 do {
351 gctx->funcs[i].fn_u.ctr(ctx, dst, src, &ctrblk);
352
353 src += num_blocks;
354 dst += num_blocks;
355 nbytes -= func_bytes;
356 } while (nbytes >= func_bytes);
357
358 if (nbytes < bsize)
359 goto done;
360 }
361 }
362
363done:
364 u128_to_be128((be128 *)walk->iv, &ctrblk);
365 return nbytes;
366}
367
368int glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx,
369 struct blkcipher_desc *desc, struct scatterlist *dst,
370 struct scatterlist *src, unsigned int nbytes)
371{
372 const unsigned int bsize = 128 / 8;
373 bool fpu_enabled = false;
374 struct blkcipher_walk walk;
375 int err;
376
377 blkcipher_walk_init(&walk, dst, src, nbytes);
378 err = blkcipher_walk_virt_block(desc, &walk, bsize);
379
380 while ((nbytes = walk.nbytes) >= bsize) {
381 fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
382 desc, fpu_enabled, nbytes);
383 nbytes = __glue_ctr_crypt_128bit(gctx, desc, &walk);
384 err = blkcipher_walk_done(desc, &walk, nbytes);
385 }
386
387 glue_fpu_end(fpu_enabled);
388
389 if (walk.nbytes) {
390 glue_ctr_crypt_final_128bit(
391 gctx->funcs[gctx->num_funcs - 1].fn_u.ctr, desc, &walk);
392 err = blkcipher_walk_done(desc, &walk, 0);
393 }
394
395 return err;
396}
397 47
398static void serpent_decrypt_cbc_xway(void *ctx, u128 *dst, const u128 *src) 48static void serpent_decrypt_cbc_xway(void *ctx, u128 *dst, const u128 *src)
399{ 49{
diff --git a/arch/x86/include/asm/crypto/glue_helper.h b/arch/x86/include/asm/crypto/glue_helper.h
new file mode 100644
index 00000000000..3e408bddc96
--- /dev/null
+++ b/arch/x86/include/asm/crypto/glue_helper.h
@@ -0,0 +1,115 @@
1/*
2 * Shared glue code for 128bit block ciphers
3 */
4
5#ifndef _CRYPTO_GLUE_HELPER_H
6#define _CRYPTO_GLUE_HELPER_H
7
8#include <linux/kernel.h>
9#include <linux/crypto.h>
10#include <asm/i387.h>
11#include <crypto/b128ops.h>
12
13typedef void (*common_glue_func_t)(void *ctx, u8 *dst, const u8 *src);
14typedef void (*common_glue_cbc_func_t)(void *ctx, u128 *dst, const u128 *src);
15typedef void (*common_glue_ctr_func_t)(void *ctx, u128 *dst, const u128 *src,
16 u128 *iv);
17
18#define GLUE_FUNC_CAST(fn) ((common_glue_func_t)(fn))
19#define GLUE_CBC_FUNC_CAST(fn) ((common_glue_cbc_func_t)(fn))
20#define GLUE_CTR_FUNC_CAST(fn) ((common_glue_ctr_func_t)(fn))
21
22struct common_glue_func_entry {
23 unsigned int num_blocks; /* number of blocks that @fn will process */
24 union {
25 common_glue_func_t ecb;
26 common_glue_cbc_func_t cbc;
27 common_glue_ctr_func_t ctr;
28 } fn_u;
29};
30
31struct common_glue_ctx {
32 unsigned int num_funcs;
33 int fpu_blocks_limit; /* -1 means fpu not needed at all */
34
35 /*
36 * First funcs entry must have largest num_blocks and last funcs entry
37 * must have num_blocks == 1!
38 */
39 struct common_glue_func_entry funcs[];
40};
41
42static inline bool glue_fpu_begin(unsigned int bsize, int fpu_blocks_limit,
43 struct blkcipher_desc *desc,
44 bool fpu_enabled, unsigned int nbytes)
45{
46 if (likely(fpu_blocks_limit < 0))
47 return false;
48
49 if (fpu_enabled)
50 return true;
51
52 /*
53 * Vector-registers are only used when chunk to be processed is large
54 * enough, so do not enable FPU until it is necessary.
55 */
56 if (nbytes < bsize * (unsigned int)fpu_blocks_limit)
57 return false;
58
59 if (desc) {
60 /* prevent sleeping if FPU is in use */
61 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
62 }
63
64 kernel_fpu_begin();
65 return true;
66}
67
68static inline void glue_fpu_end(bool fpu_enabled)
69{
70 if (fpu_enabled)
71 kernel_fpu_end();
72}
73
74static inline void u128_to_be128(be128 *dst, const u128 *src)
75{
76 dst->a = cpu_to_be64(src->a);
77 dst->b = cpu_to_be64(src->b);
78}
79
80static inline void be128_to_u128(u128 *dst, const be128 *src)
81{
82 dst->a = be64_to_cpu(src->a);
83 dst->b = be64_to_cpu(src->b);
84}
85
86static inline void u128_inc(u128 *i)
87{
88 i->b++;
89 if (!i->b)
90 i->a++;
91}
92
93extern int glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx,
94 struct blkcipher_desc *desc,
95 struct scatterlist *dst,
96 struct scatterlist *src, unsigned int nbytes);
97
98extern int glue_cbc_encrypt_128bit(const common_glue_func_t fn,
99 struct blkcipher_desc *desc,
100 struct scatterlist *dst,
101 struct scatterlist *src,
102 unsigned int nbytes);
103
104extern int glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
105 struct blkcipher_desc *desc,
106 struct scatterlist *dst,
107 struct scatterlist *src,
108 unsigned int nbytes);
109
110extern int glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx,
111 struct blkcipher_desc *desc,
112 struct scatterlist *dst,
113 struct scatterlist *src, unsigned int nbytes);
114
115#endif /* _CRYPTO_GLUE_HELPER_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-22 07:48:47 -0400