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authorHuang Ying <ying.huang@intel.com>2009-10-18 22:53:06 -0400
committerHerbert Xu <herbert@gondor.apana.org.au>2009-10-18 22:53:06 -0400
commit0e1227d356e9b2fe0500d6cc7084f752040a1e0e (patch)
tree6f059b8e3c31539942ad244e7aadabcb54e8d904 /arch/x86/crypto
parent4c6ab3ee4cdb86cbd4e9400dd22fad7701cbe795 (diff)
crypto: ghash - Add PCLMULQDQ accelerated implementation
PCLMULQDQ is used to accelerate the most time-consuming part of GHASH, carry-less multiplication. More information about PCLMULQDQ can be found at: http://software.intel.com/en-us/articles/carry-less-multiplication-and-its-usage-for-computing-the-gcm-mode/ Because PCLMULQDQ changes XMM state, its usage must be enclosed with kernel_fpu_begin/end, which can be used only in process context, the acceleration is implemented as crypto_ahash. That is, request in soft IRQ context will be defered to the cryptd kernel thread. Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch/x86/crypto')
-rw-r--r--arch/x86/crypto/Makefile3
-rw-r--r--arch/x86/crypto/ghash-clmulni-intel_asm.S157
-rw-r--r--arch/x86/crypto/ghash-clmulni-intel_glue.c333
3 files changed, 493 insertions, 0 deletions
diff --git a/arch/x86/crypto/Makefile b/arch/x86/crypto/Makefile
index cfb0010fa940..1a58ad89fdf7 100644
--- a/arch/x86/crypto/Makefile
+++ b/arch/x86/crypto/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_CRYPTO_AES_X86_64) += aes-x86_64.o
12obj-$(CONFIG_CRYPTO_TWOFISH_X86_64) += twofish-x86_64.o 12obj-$(CONFIG_CRYPTO_TWOFISH_X86_64) += twofish-x86_64.o
13obj-$(CONFIG_CRYPTO_SALSA20_X86_64) += salsa20-x86_64.o 13obj-$(CONFIG_CRYPTO_SALSA20_X86_64) += salsa20-x86_64.o
14obj-$(CONFIG_CRYPTO_AES_NI_INTEL) += aesni-intel.o 14obj-$(CONFIG_CRYPTO_AES_NI_INTEL) += aesni-intel.o
15obj-$(CONFIG_CRYPTO_GHASH_CLMUL_NI_INTEL) += ghash-clmulni-intel.o
15 16
16obj-$(CONFIG_CRYPTO_CRC32C_INTEL) += crc32c-intel.o 17obj-$(CONFIG_CRYPTO_CRC32C_INTEL) += crc32c-intel.o
17 18
@@ -24,3 +25,5 @@ twofish-x86_64-y := twofish-x86_64-asm_64.o twofish_glue.o
24salsa20-x86_64-y := salsa20-x86_64-asm_64.o salsa20_glue.o 25salsa20-x86_64-y := salsa20-x86_64-asm_64.o salsa20_glue.o
25 26
26aesni-intel-y := aesni-intel_asm.o aesni-intel_glue.o 27aesni-intel-y := aesni-intel_asm.o aesni-intel_glue.o
28
29ghash-clmulni-intel-y := ghash-clmulni-intel_asm.o ghash-clmulni-intel_glue.o
diff --git a/arch/x86/crypto/ghash-clmulni-intel_asm.S b/arch/x86/crypto/ghash-clmulni-intel_asm.S
new file mode 100644
index 000000000000..b9e787a511da
--- /dev/null
+++ b/arch/x86/crypto/ghash-clmulni-intel_asm.S
@@ -0,0 +1,157 @@
1/*
2 * Accelerated GHASH implementation with Intel PCLMULQDQ-NI
3 * instructions. This file contains accelerated part of ghash
4 * implementation. More information about PCLMULQDQ can be found at:
5 *
6 * http://software.intel.com/en-us/articles/carry-less-multiplication-and-its-usage-for-computing-the-gcm-mode/
7 *
8 * Copyright (c) 2009 Intel Corp.
9 * Author: Huang Ying <ying.huang@intel.com>
10 * Vinodh Gopal
11 * Erdinc Ozturk
12 * Deniz Karakoyunlu
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 version 2 as published
16 * by the Free Software Foundation.
17 */
18
19#include <linux/linkage.h>
20
21.align 16
22.Lbswap_mask:
23 .octa 0x000102030405060708090a0b0c0d0e0f
24.Lpoly:
25 .octa 0xc2000000000000000000000000000001
26.Ltwo_one:
27 .octa 0x00000001000000000000000000000001
28
29#define DATA %xmm0
30#define SHASH %xmm1
31#define T1 %xmm2
32#define T2 %xmm3
33#define T3 %xmm4
34#define BSWAP %xmm5
35#define IN1 %xmm6
36
37.text
38
39/*
40 * __clmul_gf128mul_ble: internal ABI
41 * input:
42 * DATA: operand1
43 * SHASH: operand2, hash_key << 1 mod poly
44 * output:
45 * DATA: operand1 * operand2 mod poly
46 * changed:
47 * T1
48 * T2
49 * T3
50 */
51__clmul_gf128mul_ble:
52 movaps DATA, T1
53 pshufd $0b01001110, DATA, T2
54 pshufd $0b01001110, SHASH, T3
55 pxor DATA, T2
56 pxor SHASH, T3
57
58 # pclmulqdq $0x00, SHASH, DATA # DATA = a0 * b0
59 .byte 0x66, 0x0f, 0x3a, 0x44, 0xc1, 0x00
60 # pclmulqdq $0x11, SHASH, T1 # T1 = a1 * b1
61 .byte 0x66, 0x0f, 0x3a, 0x44, 0xd1, 0x11
62 # pclmulqdq $0x00, T3, T2 # T2 = (a1 + a0) * (b1 + b0)
63 .byte 0x66, 0x0f, 0x3a, 0x44, 0xdc, 0x00
64 pxor DATA, T2
65 pxor T1, T2 # T2 = a0 * b1 + a1 * b0
66
67 movaps T2, T3
68 pslldq $8, T3
69 psrldq $8, T2
70 pxor T3, DATA
71 pxor T2, T1 # <T1:DATA> is result of
72 # carry-less multiplication
73
74 # first phase of the reduction
75 movaps DATA, T3
76 psllq $1, T3
77 pxor DATA, T3
78 psllq $5, T3
79 pxor DATA, T3
80 psllq $57, T3
81 movaps T3, T2
82 pslldq $8, T2
83 psrldq $8, T3
84 pxor T2, DATA
85 pxor T3, T1
86
87 # second phase of the reduction
88 movaps DATA, T2
89 psrlq $5, T2
90 pxor DATA, T2
91 psrlq $1, T2
92 pxor DATA, T2
93 psrlq $1, T2
94 pxor T2, T1
95 pxor T1, DATA
96 ret
97
98/* void clmul_ghash_mul(char *dst, const be128 *shash) */
99ENTRY(clmul_ghash_mul)
100 movups (%rdi), DATA
101 movups (%rsi), SHASH
102 movaps .Lbswap_mask, BSWAP
103 pshufb BSWAP, DATA
104 call __clmul_gf128mul_ble
105 pshufb BSWAP, DATA
106 movups DATA, (%rdi)
107 ret
108
109/*
110 * void clmul_ghash_update(char *dst, const char *src, unsigned int srclen,
111 * const be128 *shash);
112 */
113ENTRY(clmul_ghash_update)
114 cmp $16, %rdx
115 jb .Lupdate_just_ret # check length
116 movaps .Lbswap_mask, BSWAP
117 movups (%rdi), DATA
118 movups (%rcx), SHASH
119 pshufb BSWAP, DATA
120.align 4
121.Lupdate_loop:
122 movups (%rsi), IN1
123 pshufb BSWAP, IN1
124 pxor IN1, DATA
125 call __clmul_gf128mul_ble
126 sub $16, %rdx
127 add $16, %rsi
128 cmp $16, %rdx
129 jge .Lupdate_loop
130 pshufb BSWAP, DATA
131 movups DATA, (%rdi)
132.Lupdate_just_ret:
133 ret
134
135/*
136 * void clmul_ghash_setkey(be128 *shash, const u8 *key);
137 *
138 * Calculate hash_key << 1 mod poly
139 */
140ENTRY(clmul_ghash_setkey)
141 movaps .Lbswap_mask, BSWAP
142 movups (%rsi), %xmm0
143 pshufb BSWAP, %xmm0
144 movaps %xmm0, %xmm1
145 psllq $1, %xmm0
146 psrlq $63, %xmm1
147 movaps %xmm1, %xmm2
148 pslldq $8, %xmm1
149 psrldq $8, %xmm2
150 por %xmm1, %xmm0
151 # reduction
152 pshufd $0b00100100, %xmm2, %xmm1
153 pcmpeqd .Ltwo_one, %xmm1
154 pand .Lpoly, %xmm1
155 pxor %xmm1, %xmm0
156 movups %xmm0, (%rdi)
157 ret
diff --git a/arch/x86/crypto/ghash-clmulni-intel_glue.c b/arch/x86/crypto/ghash-clmulni-intel_glue.c
new file mode 100644
index 000000000000..65d409644d72
--- /dev/null
+++ b/arch/x86/crypto/ghash-clmulni-intel_glue.c
@@ -0,0 +1,333 @@
1/*
2 * Accelerated GHASH implementation with Intel PCLMULQDQ-NI
3 * instructions. This file contains glue code.
4 *
5 * Copyright (c) 2009 Intel Corp.
6 * Author: Huang Ying <ying.huang@intel.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published
10 * by the Free Software Foundation.
11 */
12
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/kernel.h>
16#include <linux/crypto.h>
17#include <crypto/algapi.h>
18#include <crypto/cryptd.h>
19#include <crypto/gf128mul.h>
20#include <crypto/internal/hash.h>
21#include <asm/i387.h>
22
23#define GHASH_BLOCK_SIZE 16
24#define GHASH_DIGEST_SIZE 16
25
26void clmul_ghash_mul(char *dst, const be128 *shash);
27
28void clmul_ghash_update(char *dst, const char *src, unsigned int srclen,
29 const be128 *shash);
30
31void clmul_ghash_setkey(be128 *shash, const u8 *key);
32
33struct ghash_async_ctx {
34 struct cryptd_ahash *cryptd_tfm;
35};
36
37struct ghash_ctx {
38 be128 shash;
39};
40
41struct ghash_desc_ctx {
42 u8 buffer[GHASH_BLOCK_SIZE];
43 u32 bytes;
44};
45
46static int ghash_init(struct shash_desc *desc)
47{
48 struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
49
50 memset(dctx, 0, sizeof(*dctx));
51
52 return 0;
53}
54
55static int ghash_setkey(struct crypto_shash *tfm,
56 const u8 *key, unsigned int keylen)
57{
58 struct ghash_ctx *ctx = crypto_shash_ctx(tfm);
59
60 if (keylen != GHASH_BLOCK_SIZE) {
61 crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
62 return -EINVAL;
63 }
64
65 clmul_ghash_setkey(&ctx->shash, key);
66
67 return 0;
68}
69
70static int ghash_update(struct shash_desc *desc,
71 const u8 *src, unsigned int srclen)
72{
73 struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
74 struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
75 u8 *dst = dctx->buffer;
76
77 kernel_fpu_begin();
78 if (dctx->bytes) {
79 int n = min(srclen, dctx->bytes);
80 u8 *pos = dst + (GHASH_BLOCK_SIZE - dctx->bytes);
81
82 dctx->bytes -= n;
83 srclen -= n;
84
85 while (n--)
86 *pos++ ^= *src++;
87
88 if (!dctx->bytes)
89 clmul_ghash_mul(dst, &ctx->shash);
90 }
91
92 clmul_ghash_update(dst, src, srclen, &ctx->shash);
93 kernel_fpu_end();
94
95 if (srclen & 0xf) {
96 src += srclen - (srclen & 0xf);
97 srclen &= 0xf;
98 dctx->bytes = GHASH_BLOCK_SIZE - srclen;
99 while (srclen--)
100 *dst++ ^= *src++;
101 }
102
103 return 0;
104}
105
106static void ghash_flush(struct ghash_ctx *ctx, struct ghash_desc_ctx *dctx)
107{
108 u8 *dst = dctx->buffer;
109
110 if (dctx->bytes) {
111 u8 *tmp = dst + (GHASH_BLOCK_SIZE - dctx->bytes);
112
113 while (dctx->bytes--)
114 *tmp++ ^= 0;
115
116 kernel_fpu_begin();
117 clmul_ghash_mul(dst, &ctx->shash);
118 kernel_fpu_end();
119 }
120
121 dctx->bytes = 0;
122}
123
124static int ghash_final(struct shash_desc *desc, u8 *dst)
125{
126 struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
127 struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
128 u8 *buf = dctx->buffer;
129
130 ghash_flush(ctx, dctx);
131 memcpy(dst, buf, GHASH_BLOCK_SIZE);
132
133 return 0;
134}
135
136static struct shash_alg ghash_alg = {
137 .digestsize = GHASH_DIGEST_SIZE,
138 .init = ghash_init,
139 .update = ghash_update,
140 .final = ghash_final,
141 .setkey = ghash_setkey,
142 .descsize = sizeof(struct ghash_desc_ctx),
143 .base = {
144 .cra_name = "__ghash",
145 .cra_driver_name = "__ghash-pclmulqdqni",
146 .cra_priority = 0,
147 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
148 .cra_blocksize = GHASH_BLOCK_SIZE,
149 .cra_ctxsize = sizeof(struct ghash_ctx),
150 .cra_module = THIS_MODULE,
151 .cra_list = LIST_HEAD_INIT(ghash_alg.base.cra_list),
152 },
153};
154
155static int ghash_async_init(struct ahash_request *req)
156{
157 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
158 struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
159 struct ahash_request *cryptd_req = ahash_request_ctx(req);
160 struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
161
162 if (irq_fpu_usable()) {
163 memcpy(cryptd_req, req, sizeof(*req));
164 ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
165 return crypto_ahash_init(cryptd_req);
166 } else {
167 struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
168 struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
169
170 desc->tfm = child;
171 desc->flags = req->base.flags;
172 return crypto_shash_init(desc);
173 }
174}
175
176static int ghash_async_update(struct ahash_request *req)
177{
178 struct ahash_request *cryptd_req = ahash_request_ctx(req);
179
180 if (irq_fpu_usable()) {
181 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
182 struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
183 struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
184
185 memcpy(cryptd_req, req, sizeof(*req));
186 ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
187 return crypto_ahash_update(cryptd_req);
188 } else {
189 struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
190 return shash_ahash_update(req, desc);
191 }
192}
193
194static int ghash_async_final(struct ahash_request *req)
195{
196 struct ahash_request *cryptd_req = ahash_request_ctx(req);
197
198 if (irq_fpu_usable()) {
199 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
200 struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
201 struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
202
203 memcpy(cryptd_req, req, sizeof(*req));
204 ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
205 return crypto_ahash_final(cryptd_req);
206 } else {
207 struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
208 return crypto_shash_final(desc, req->result);
209 }
210}
211
212static int ghash_async_digest(struct ahash_request *req)
213{
214 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
215 struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
216 struct ahash_request *cryptd_req = ahash_request_ctx(req);
217 struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
218
219 if (irq_fpu_usable()) {
220 memcpy(cryptd_req, req, sizeof(*req));
221 ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
222 return crypto_ahash_digest(cryptd_req);
223 } else {
224 struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
225 struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
226
227 desc->tfm = child;
228 desc->flags = req->base.flags;
229 return shash_ahash_digest(req, desc);
230 }
231}
232
233static int ghash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
234 unsigned int keylen)
235{
236 struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
237 struct crypto_ahash *child = &ctx->cryptd_tfm->base;
238 int err;
239
240 crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
241 crypto_ahash_set_flags(child, crypto_ahash_get_flags(tfm)
242 & CRYPTO_TFM_REQ_MASK);
243 err = crypto_ahash_setkey(child, key, keylen);
244 crypto_ahash_set_flags(tfm, crypto_ahash_get_flags(child)
245 & CRYPTO_TFM_RES_MASK);
246
247 return 0;
248}
249
250static int ghash_async_init_tfm(struct crypto_tfm *tfm)
251{
252 struct cryptd_ahash *cryptd_tfm;
253 struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
254
255 cryptd_tfm = cryptd_alloc_ahash("__ghash-pclmulqdqni", 0, 0);
256 if (IS_ERR(cryptd_tfm))
257 return PTR_ERR(cryptd_tfm);
258 ctx->cryptd_tfm = cryptd_tfm;
259 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
260 sizeof(struct ahash_request) +
261 crypto_ahash_reqsize(&cryptd_tfm->base));
262
263 return 0;
264}
265
266static void ghash_async_exit_tfm(struct crypto_tfm *tfm)
267{
268 struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
269
270 cryptd_free_ahash(ctx->cryptd_tfm);
271}
272
273static struct ahash_alg ghash_async_alg = {
274 .init = ghash_async_init,
275 .update = ghash_async_update,
276 .final = ghash_async_final,
277 .setkey = ghash_async_setkey,
278 .digest = ghash_async_digest,
279 .halg = {
280 .digestsize = GHASH_DIGEST_SIZE,
281 .base = {
282 .cra_name = "ghash",
283 .cra_driver_name = "ghash-clmulni",
284 .cra_priority = 400,
285 .cra_flags = CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC,
286 .cra_blocksize = GHASH_BLOCK_SIZE,
287 .cra_type = &crypto_ahash_type,
288 .cra_module = THIS_MODULE,
289 .cra_list = LIST_HEAD_INIT(ghash_async_alg.halg.base.cra_list),
290 .cra_init = ghash_async_init_tfm,
291 .cra_exit = ghash_async_exit_tfm,
292 },
293 },
294};
295
296static int __init ghash_pclmulqdqni_mod_init(void)
297{
298 int err;
299
300 if (!cpu_has_pclmulqdq) {
301 printk(KERN_INFO "Intel PCLMULQDQ-NI instructions are not"
302 " detected.\n");
303 return -ENODEV;
304 }
305
306 err = crypto_register_shash(&ghash_alg);
307 if (err)
308 goto err_out;
309 err = crypto_register_ahash(&ghash_async_alg);
310 if (err)
311 goto err_shash;
312
313 return 0;
314
315err_shash:
316 crypto_unregister_shash(&ghash_alg);
317err_out:
318 return err;
319}
320
321static void __exit ghash_pclmulqdqni_mod_exit(void)
322{
323 crypto_unregister_ahash(&ghash_async_alg);
324 crypto_unregister_shash(&ghash_alg);
325}
326
327module_init(ghash_pclmulqdqni_mod_init);
328module_exit(ghash_pclmulqdqni_mod_exit);
329
330MODULE_LICENSE("GPL");
331MODULE_DESCRIPTION("GHASH Message Digest Algorithm, "
332 "acclerated by PCLMULQDQ-NI");
333MODULE_ALIAS("ghash");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-02 14:14:39 -0400